A Mushroom Stands Still and Grows From the Ground and Is Not a Plant
Learn why the two-kingdom system failed and the five-kingdom system replaced it, the characters of Monera and Protista, how fungi differ from plants, and how animals are divided by symmetry and notochord.
If a mushroom is not a plant, what is it?
A fungus — and the reason is the one character that matters most about any organism: how it feeds itself.
A mushroom does everything a plant appears to do. It stands still, it grows out of the ground, it has no mouth and no legs. But it has no chlorophyll, so it cannot photosynthesise, and it cannot make a single molecule of its own food.
Instead it secretes enzymes onto dead organic matter around it and absorbs the digested products. That is heterotrophic nutrition, and it is what an animal does by a different method.
Being stationary is not what makes something a plant. Making its own food is.
That single realisation is why the old two-kingdom system had to go, and it is why five kingdoms are needed instead of two. This page covers the second part of the CBSE Class 9 Science chapter on diversity and classification.
A mushroom does everything a plant appears to do. It stands still, it grows out of the ground, it has no mouth and no legs. But it has no chlorophyll, so it cannot photosynthesise, and it cannot make a single molecule of its own food.
Instead it secretes enzymes onto dead organic matter around it and absorbs the digested products. That is heterotrophic nutrition, and it is what an animal does by a different method.
Being stationary is not what makes something a plant. Making its own food is.
That single realisation is why the old two-kingdom system had to go, and it is why five kingdoms are needed instead of two. This page covers the second part of the CBSE Class 9 Science chapter on diversity and classification.
Why did the two-kingdom system have to be replaced?
Because specific organisms could not be placed in either kingdom, and each failure pointed to a character the system had ignored.
The earliest formal system used two kingdoms — Plantae and Animalia. Every living thing was to be either a plant or an animal.
What it could not handle:
- Bacteria are neither. They have no true nucleus, and the system made no distinction between prokaryotes and eukaryotes — ignoring the most fundamental difference in all of biology
- Fungi are not plants. They have no chlorophyll and are heterotrophic, as the opening described
- Euglena moves with a flagellum like an animal and photosynthesises like a plant. A system with two boxes has nowhere to put it
- Unicellular and multicellular organisms were lumped together, although the difference in body organisation is enormous
The five-kingdom system separates organisms into Monera, Protista, Fungi, Plantae and Animalia, using exactly the criteria the previous part of this chapter established:
- Cell structure — prokaryotic or eukaryotic
- Body organisation — unicellular, or multicellular with tissues
- Mode of nutrition — autotrophic or heterotrophic
Apply those three in order and every organism above finds a place. Bacteria are prokaryotic, so Monera. Euglena is eukaryotic and unicellular, so Protista, whatever its nutrition. Fungi are eukaryotic, multicellular and heterotrophic, so a kingdom of their own.
The system was revised because of a specific failure, not a preference. That is the same pattern as the atomic models chapter of this course: a model is replaced when a particular observation will not fit it, and the replacement is built to accommodate exactly that observation. A classification is a scientific claim and can be corrected.
Five kingdoms is itself a stage, not the last word. Later systems split Monera into two, giving six kingdoms, or reorganise everything into three domains. The direction of travel is always the same — the deepest differences get recognised as the evidence improves.
The earliest formal system used two kingdoms — Plantae and Animalia. Every living thing was to be either a plant or an animal.
What it could not handle:
- Bacteria are neither. They have no true nucleus, and the system made no distinction between prokaryotes and eukaryotes — ignoring the most fundamental difference in all of biology
- Fungi are not plants. They have no chlorophyll and are heterotrophic, as the opening described
- Euglena moves with a flagellum like an animal and photosynthesises like a plant. A system with two boxes has nowhere to put it
- Unicellular and multicellular organisms were lumped together, although the difference in body organisation is enormous
The five-kingdom system separates organisms into Monera, Protista, Fungi, Plantae and Animalia, using exactly the criteria the previous part of this chapter established:
- Cell structure — prokaryotic or eukaryotic
- Body organisation — unicellular, or multicellular with tissues
- Mode of nutrition — autotrophic or heterotrophic
Apply those three in order and every organism above finds a place. Bacteria are prokaryotic, so Monera. Euglena is eukaryotic and unicellular, so Protista, whatever its nutrition. Fungi are eukaryotic, multicellular and heterotrophic, so a kingdom of their own.
The system was revised because of a specific failure, not a preference. That is the same pattern as the atomic models chapter of this course: a model is replaced when a particular observation will not fit it, and the replacement is built to accommodate exactly that observation. A classification is a scientific claim and can be corrected.
Five kingdoms is itself a stage, not the last word. Later systems split Monera into two, giving six kingdoms, or reorganise everything into three domains. The direction of travel is always the same — the deepest differences get recognised as the evidence improves.
What are the characters of Monera and Protista?
Both are mostly unicellular, and the nucleus is what separates them.
Kingdom Monera:
- Prokaryotic — no true nucleus and no membrane-bound organelles
- Unicellular
- A cell wall may or may not be present, and it is not made of cellulose
- Nutrition may be autotrophic or heterotrophic
- Examples: bacteria, blue-green algae (cyanobacteria) such as Anabaena, and Mycoplasma
Kingdom Protista:
- Eukaryotic — a true nucleus enclosed in a nuclear membrane
- Unicellular
- Many move using cilia, flagella or pseudopodia
- Nutrition may be autotrophic or heterotrophic
- Examples: Amoeba (moves by pseudopodia), Paramecium (cilia), Euglena (a flagellum, and both modes of nutrition), diatoms, and Plasmodium
Worked classification. Apply the deciding character to four organisms:
- Anabaena: prokaryotic, so Monera, although it photosynthesises
- Paramecium: eukaryotic and unicellular, so Protista
- A bacterium: prokaryotic, so Monera
- Euglena: eukaryotic and unicellular, so Protista
The nucleus decides it, and nothing else does. Anabaena photosynthesises like a plant and is firmly in Monera because it has no true nucleus. Euglena photosynthesises too and is in Protista because it does have one. Nutrition does not separate these two kingdoms; cell structure does — and that is the clearest demonstration of why the criteria have to be applied in order.
**A note on the name blue-green algae. They are also called cyanobacteria, and the second name is the more honest one, because they are bacteria and not algae. The older name records what they look like; the newer one records what they are — exactly the difference between grouping by appearance and grouping by structure.
Nutrition is not diagnostic at this level.** Both kingdoms contain autotrophs and heterotrophs, so a question that gives you only the mode of nutrition has not given you enough to place an organism in Monera or Protista. It becomes diagnostic one level up, when separating fungi from plants — the subject of the next section.
Kingdom Monera:
- Prokaryotic — no true nucleus and no membrane-bound organelles
- Unicellular
- A cell wall may or may not be present, and it is not made of cellulose
- Nutrition may be autotrophic or heterotrophic
- Examples: bacteria, blue-green algae (cyanobacteria) such as Anabaena, and Mycoplasma
Kingdom Protista:
- Eukaryotic — a true nucleus enclosed in a nuclear membrane
- Unicellular
- Many move using cilia, flagella or pseudopodia
- Nutrition may be autotrophic or heterotrophic
- Examples: Amoeba (moves by pseudopodia), Paramecium (cilia), Euglena (a flagellum, and both modes of nutrition), diatoms, and Plasmodium
Worked classification. Apply the deciding character to four organisms:
- Anabaena: prokaryotic, so Monera, although it photosynthesises
- Paramecium: eukaryotic and unicellular, so Protista
- A bacterium: prokaryotic, so Monera
- Euglena: eukaryotic and unicellular, so Protista
The nucleus decides it, and nothing else does. Anabaena photosynthesises like a plant and is firmly in Monera because it has no true nucleus. Euglena photosynthesises too and is in Protista because it does have one. Nutrition does not separate these two kingdoms; cell structure does — and that is the clearest demonstration of why the criteria have to be applied in order.
**A note on the name blue-green algae. They are also called cyanobacteria, and the second name is the more honest one, because they are bacteria and not algae. The older name records what they look like; the newer one records what they are — exactly the difference between grouping by appearance and grouping by structure.
Nutrition is not diagnostic at this level.** Both kingdoms contain autotrophs and heterotrophs, so a question that gives you only the mode of nutrition has not given you enough to place an organism in Monera or Protista. It becomes diagnostic one level up, when separating fungi from plants — the subject of the next section.
How do Fungi and Plantae differ?
By cell wall composition and by mode of nutrition — and those are exactly the two characters the objective asks for.
Kingdom Fungi:
- Eukaryotic, and mostly multicellular — although yeast is unicellular
- Cell wall made of chitin
- No chlorophyll, so no photosynthesis
- Heterotrophic, and specifically saprophytic — enzymes are secreted onto dead organic matter and the digested products are absorbed
- Some are parasitic, living on other organisms
- Some live in symbiosis: a lichen is a fungus and an alga living together; mycorrhiza is a fungus living with plant roots
- Examples: Rhizopus (bread mould), Penicillium, Agaricus (mushroom), yeast
Kingdom Plantae:
- Eukaryotic and multicellular
- Cell wall made of cellulose
- Contain chlorophyll in chloroplasts
- Autotrophic — food is made by photosynthesis
- Examples: mosses, ferns, pines, mango, wheat
The comparison in two lines:
- Cell wall: fungi chitin, plants cellulose
- Nutrition: fungi heterotrophic, plants autotrophic
Everyday evidence. Mould appearing on bread left out in the rains, and a mushroom pushing up through damp leaf litter, are both feeding on dead organic matter — which is why both appear where something is decaying and neither needs light. A plant in the same place would need sunlight and would make its own food.
Fungi are essential decomposers. By breaking down dead plants and animals they release the carbon and nitrogen locked in them back into the soil and air, which is what keeps the cycles in the earth-systems chapter of this course running. Without decomposers, nutrients would stay locked in dead matter permanently.
A lichen shows why classification is by ancestry and not appearance. A lichen crusting a rock looks like a single simple organism and is two organisms in partnership — a fungus providing shelter and mineral absorption, an alga providing food by photosynthesis. Together they grow on bare rock where neither could survive alone.
The presence of a cell wall does not make an organism a plant. Fungi have walls, and so do bacteria, and all three walls are made of different materials. It is the composition of the wall, not its existence, that carries the information — which is why the answer to how do fungi differ from plants must name chitin and cellulose rather than simply saying both have walls.
Kingdom Fungi:
- Eukaryotic, and mostly multicellular — although yeast is unicellular
- Cell wall made of chitin
- No chlorophyll, so no photosynthesis
- Heterotrophic, and specifically saprophytic — enzymes are secreted onto dead organic matter and the digested products are absorbed
- Some are parasitic, living on other organisms
- Some live in symbiosis: a lichen is a fungus and an alga living together; mycorrhiza is a fungus living with plant roots
- Examples: Rhizopus (bread mould), Penicillium, Agaricus (mushroom), yeast
Kingdom Plantae:
- Eukaryotic and multicellular
- Cell wall made of cellulose
- Contain chlorophyll in chloroplasts
- Autotrophic — food is made by photosynthesis
- Examples: mosses, ferns, pines, mango, wheat
The comparison in two lines:
- Cell wall: fungi chitin, plants cellulose
- Nutrition: fungi heterotrophic, plants autotrophic
Everyday evidence. Mould appearing on bread left out in the rains, and a mushroom pushing up through damp leaf litter, are both feeding on dead organic matter — which is why both appear where something is decaying and neither needs light. A plant in the same place would need sunlight and would make its own food.
Fungi are essential decomposers. By breaking down dead plants and animals they release the carbon and nitrogen locked in them back into the soil and air, which is what keeps the cycles in the earth-systems chapter of this course running. Without decomposers, nutrients would stay locked in dead matter permanently.
A lichen shows why classification is by ancestry and not appearance. A lichen crusting a rock looks like a single simple organism and is two organisms in partnership — a fungus providing shelter and mineral absorption, an alga providing food by photosynthesis. Together they grow on bare rock where neither could survive alone.
The presence of a cell wall does not make an organism a plant. Fungi have walls, and so do bacteria, and all three walls are made of different materials. It is the composition of the wall, not its existence, that carries the information — which is why the answer to how do fungi differ from plants must name chitin and cellulose rather than simply saying both have walls.
How is Kingdom Animalia divided up?
By body symmetry, body cavity, level of organisation, and above all by whether a notochord is present.
Kingdom Animalia:
- Eukaryotic and multicellular
- No cell wall — the character that separates animals from all four other kingdoms at a stroke
- Heterotrophic, ingesting food
- Most can move, and most have tissues, organs and organ systems
The bases for subdividing:
Body symmetry.
- Asymmetrical — no plane divides the body into matching halves. Sponges
- Radial — body parts arranged around a central axis, so many planes divide it into similar halves. Hydra, starfish
- Bilateral — one plane divides the body into mirror-image left and right halves. Most animals, including earthworms, insects, fish and humans
Body cavity (coelom) — present or absent, and if present, how it is formed.
Level of organisation — cellular, tissue, organ, or organ-system level.
Notochord — a flexible rod running along the back and supporting the body.
- Animals with a notochord at some stage are chordates
- Animals without one are non-chordates, also called invertebrates
Worked classification. Apply symmetry and notochord to seven animals:
- Sponge: asymmetrical, no notochord — non-chordate
- Hydra: radial, no notochord — non-chordate
- Starfish: radial as an adult, no notochord — non-chordate
- Earthworm: bilateral, no notochord — non-chordate
- Cockroach: bilateral, no notochord — non-chordate
- Fish and frog: bilateral, notochord present — chordates
- Pigeon and human: bilateral, notochord present — chordates
A notochord is not the same as a backbone. Every vertebrate has a notochord at some stage of its development, and it is later replaced by the vertebral column. But some chordates have only a notochord and never develop a vertebral column at all. So chordate is a wider group than vertebrate, and answering has a backbone when asked about the notochord is not quite right.
Symmetry can change during a life cycle. A starfish is radially symmetrical as an adult and bilaterally symmetrical as a larva. That is why classification considers more than one stage of the life cycle, and it is another reason the adult appearance alone is not a safe guide.
No cell wall is the quickest animal test. Monera, Protista, Fungi and Plantae all contain organisms with cell walls of one material or another. An animal cell has none, which is why a single glance at cell structure under a microscope separates Animalia from everything else — and it is the character the earlier part of this chapter would have you apply first.
Kingdom Animalia:
- Eukaryotic and multicellular
- No cell wall — the character that separates animals from all four other kingdoms at a stroke
- Heterotrophic, ingesting food
- Most can move, and most have tissues, organs and organ systems
The bases for subdividing:
Body symmetry.
- Asymmetrical — no plane divides the body into matching halves. Sponges
- Radial — body parts arranged around a central axis, so many planes divide it into similar halves. Hydra, starfish
- Bilateral — one plane divides the body into mirror-image left and right halves. Most animals, including earthworms, insects, fish and humans
Body cavity (coelom) — present or absent, and if present, how it is formed.
Level of organisation — cellular, tissue, organ, or organ-system level.
Notochord — a flexible rod running along the back and supporting the body.
- Animals with a notochord at some stage are chordates
- Animals without one are non-chordates, also called invertebrates
Worked classification. Apply symmetry and notochord to seven animals:
- Sponge: asymmetrical, no notochord — non-chordate
- Hydra: radial, no notochord — non-chordate
- Starfish: radial as an adult, no notochord — non-chordate
- Earthworm: bilateral, no notochord — non-chordate
- Cockroach: bilateral, no notochord — non-chordate
- Fish and frog: bilateral, notochord present — chordates
- Pigeon and human: bilateral, notochord present — chordates
A notochord is not the same as a backbone. Every vertebrate has a notochord at some stage of its development, and it is later replaced by the vertebral column. But some chordates have only a notochord and never develop a vertebral column at all. So chordate is a wider group than vertebrate, and answering has a backbone when asked about the notochord is not quite right.
Symmetry can change during a life cycle. A starfish is radially symmetrical as an adult and bilaterally symmetrical as a larva. That is why classification considers more than one stage of the life cycle, and it is another reason the adult appearance alone is not a safe guide.
No cell wall is the quickest animal test. Monera, Protista, Fungi and Plantae all contain organisms with cell walls of one material or another. An animal cell has none, which is why a single glance at cell structure under a microscope separates Animalia from everything else — and it is the character the earlier part of this chapter would have you apply first.
Exam tip
Exam tip: name the kingdom and the character that placed it
Give the deciding character with every classification — prokaryotic, therefore Monera; cellulose wall and autotrophic, therefore Plantae.
The nucleus separates Monera from Protista, not nutrition. Anabaena photosynthesises and is in Monera; Euglena photosynthesises and is in Protista.
For Fungi against Plantae, name both characters: wall of chitin against cellulose, and heterotrophic (saprophytic) against autotrophic.
A cell wall does not make an organism a plant — the composition of the wall carries the information.
No cell wall means Animalia, which is the fastest test available.
Name the three symmetry types with examples: asymmetrical (sponge), radial (Hydra, starfish), bilateral (most animals).
Notochord present means chordate; absent means non-chordate. A notochord is not the same as a backbone, and chordate is wider than vertebrate.
For why two kingdoms failed, name the specific organisms — bacteria (no nucleus), fungi (no chlorophyll), Euglena (both plant-like and animal-like).
Say that five kingdoms uses cell structure, body organisation and mode of nutrition, and that it is itself a stage that later systems revise.
And write organism names in italics, with kingdom names capitalised.
The nucleus separates Monera from Protista, not nutrition. Anabaena photosynthesises and is in Monera; Euglena photosynthesises and is in Protista.
For Fungi against Plantae, name both characters: wall of chitin against cellulose, and heterotrophic (saprophytic) against autotrophic.
A cell wall does not make an organism a plant — the composition of the wall carries the information.
No cell wall means Animalia, which is the fastest test available.
Name the three symmetry types with examples: asymmetrical (sponge), radial (Hydra, starfish), bilateral (most animals).
Notochord present means chordate; absent means non-chordate. A notochord is not the same as a backbone, and chordate is wider than vertebrate.
For why two kingdoms failed, name the specific organisms — bacteria (no nucleus), fungi (no chlorophyll), Euglena (both plant-like and animal-like).
Say that five kingdoms uses cell structure, body organisation and mode of nutrition, and that it is itself a stage that later systems revise.
And write organism names in italics, with kingdom names capitalised.
Did you know
Why a lichen can grow on bare rock
Look at a bare rock face on a hillside and you will often find it patched with grey-green crusts. Nothing else is growing there — no soil, no moss, no grass. Those crusts are lichens, and they can live where nothing else can because each one is two organisms working together.
The fungus provides the structure. It grips the rock, holds water, and slowly dissolves minerals out of the stone itself. What it cannot do is make food, because it has no chlorophyll.
The alga living inside that structure can. It photosynthesises and supplies the sugars both partners need. What it cannot do is survive exposed on dry rock without shelter or a supply of minerals.
Neither can live there alone, and together they can — which is why lichens are often the first living things to colonise bare rock. Over long periods they break the surface down into the beginnings of soil, and once there is soil, mosses and then larger plants can follow.
A lichen also complicates the tidy five-kingdom picture, and in an instructive way. Which kingdom does a lichen belong to? The question has no single answer, because a lichen is not one organism. It is a partnership, and the classification scheme has no box for partnerships.
That is worth noticing rather than worrying about. A classification is a tool for organising organisms, and like the models in the opening chapter of this course, it works well within its range and has edges. Lichens sit on one of those edges, and so do viruses, which the cell chapter of this course placed outside cell theory for a similar reason.
The fungus provides the structure. It grips the rock, holds water, and slowly dissolves minerals out of the stone itself. What it cannot do is make food, because it has no chlorophyll.
The alga living inside that structure can. It photosynthesises and supplies the sugars both partners need. What it cannot do is survive exposed on dry rock without shelter or a supply of minerals.
Neither can live there alone, and together they can — which is why lichens are often the first living things to colonise bare rock. Over long periods they break the surface down into the beginnings of soil, and once there is soil, mosses and then larger plants can follow.
A lichen also complicates the tidy five-kingdom picture, and in an instructive way. Which kingdom does a lichen belong to? The question has no single answer, because a lichen is not one organism. It is a partnership, and the classification scheme has no box for partnerships.
That is worth noticing rather than worrying about. A classification is a tool for organising organisms, and like the models in the opening chapter of this course, it works well within its range and has edges. Lichens sit on one of those edges, and so do viruses, which the cell chapter of this course placed outside cell theory for a similar reason.
Exam relevance
Why do the five kingdoms come up again in NEET?
Because the characters of each kingdom are pure recall, and NEET tests them directly from a Class 11 chapter devoted to exactly this material.
This is the foundation for Class 11 Biology Biological Classification, a standing part of the NEET syllabus, which takes the five kingdoms and treats each in far more detail. Monera is split by shape and by nutrition, with archaebacteria, cyanobacteria, chemosynthetic and heterotrophic bacteria each described. Protista is divided into chrysophytes, dinoflagellates, euglenoids, slime moulds and protozoans. Fungi is divided into Phycomycetes, Ascomycetes, Basidiomycetes and Deuteromycetes. Every one of those subdivisions assumes the kingdom-level characters learned here.
Viruses, viroids and lichens are covered at the end of that chapter as organisms outside the scheme — which is exactly the point the previous section made about lichens.
Kingdom Plantae is expanded in Class 11 Plant Kingdom, with algae, bryophytes, pteridophytes, gymnosperms and angiosperms; Kingdom Animalia in Class 11 Animal Kingdom, where the bases of classification on this page — symmetry, coelom, level of organisation and notochord — become the formal criteria, and each phylum from Porifera to Chordata is characterised by them. Those two chapters are among the most heavily examined in NEET, and this page supplies their vocabulary.
What the questions look like. Match-the-column items pairing an organism with its kingdom are the commonest form, and the pairs that catch students out are Anabaena (Monera, despite photosynthesising) and Euglena (Protista). Statement-count questions of the how many of the following belong to Protista kind suit the topic exactly. Assertion-reason items favour the claim that fungi are not plants, paired with a reason about chlorophyll or the cell wall. Diagram-based questions ask for identification from a sketch.
How board and competitive emphasis differ. A board paper asks you to give three characters of Monera, or two differences between fungi and plants, and to explain why the two-kingdom system was inadequate. A NEET item gives four organisms and asks which belongs to a different kingdom from the rest, or gives a character and asks which kingdom it identifies — so the organism-to-kingdom pairings matter far more than the descriptions.
The single trap that costs the most marks. Placing a photosynthesising organism in Plantae. Anabaena photosynthesises and belongs to Monera because it is prokaryotic; Euglena photosynthesises and belongs to Protista because it is unicellular. Cell structure is applied before nutrition, always, and a question that offers a photosynthetic prokaryote is testing exactly that ordering.
A second trap worth naming. Treating notochord and backbone as the same thing. All vertebrates are chordates and not all chordates are vertebrates, so chordate is the wider term — and a question asking for the basis on which Animalia is divided wants notochord, not vertebral column.
This is the foundation for Class 11 Biology Biological Classification, a standing part of the NEET syllabus, which takes the five kingdoms and treats each in far more detail. Monera is split by shape and by nutrition, with archaebacteria, cyanobacteria, chemosynthetic and heterotrophic bacteria each described. Protista is divided into chrysophytes, dinoflagellates, euglenoids, slime moulds and protozoans. Fungi is divided into Phycomycetes, Ascomycetes, Basidiomycetes and Deuteromycetes. Every one of those subdivisions assumes the kingdom-level characters learned here.
Viruses, viroids and lichens are covered at the end of that chapter as organisms outside the scheme — which is exactly the point the previous section made about lichens.
Kingdom Plantae is expanded in Class 11 Plant Kingdom, with algae, bryophytes, pteridophytes, gymnosperms and angiosperms; Kingdom Animalia in Class 11 Animal Kingdom, where the bases of classification on this page — symmetry, coelom, level of organisation and notochord — become the formal criteria, and each phylum from Porifera to Chordata is characterised by them. Those two chapters are among the most heavily examined in NEET, and this page supplies their vocabulary.
What the questions look like. Match-the-column items pairing an organism with its kingdom are the commonest form, and the pairs that catch students out are Anabaena (Monera, despite photosynthesising) and Euglena (Protista). Statement-count questions of the how many of the following belong to Protista kind suit the topic exactly. Assertion-reason items favour the claim that fungi are not plants, paired with a reason about chlorophyll or the cell wall. Diagram-based questions ask for identification from a sketch.
How board and competitive emphasis differ. A board paper asks you to give three characters of Monera, or two differences between fungi and plants, and to explain why the two-kingdom system was inadequate. A NEET item gives four organisms and asks which belongs to a different kingdom from the rest, or gives a character and asks which kingdom it identifies — so the organism-to-kingdom pairings matter far more than the descriptions.
The single trap that costs the most marks. Placing a photosynthesising organism in Plantae. Anabaena photosynthesises and belongs to Monera because it is prokaryotic; Euglena photosynthesises and belongs to Protista because it is unicellular. Cell structure is applied before nutrition, always, and a question that offers a photosynthetic prokaryote is testing exactly that ordering.
A second trap worth naming. Treating notochord and backbone as the same thing. All vertebrates are chordates and not all chordates are vertebrates, so chordate is the wider term — and a question asking for the basis on which Animalia is divided wants notochord, not vertebral column.
Key takeaways
The five kingdoms and their characters: quick revision
- The two-kingdom system failed because bacteria have no true nucleus, fungi have no chlorophyll, Euglena is both plant-like and animal-like, and unicellular and multicellular organisms were lumped together.
- The five-kingdom system — Monera, Protista, Fungi, Plantae, Animalia — uses cell structure, body organisation and mode of nutrition.
- Monera: prokaryotic, unicellular, wall may be present but not of cellulose, nutrition either mode. Bacteria, blue-green algae (Anabaena), Mycoplasma.
- Protista: eukaryotic, unicellular, often moving by cilia, flagella or pseudopodia. Amoeba, Paramecium, Euglena, diatoms, Plasmodium.
- The nucleus separates Monera from Protista — Anabaena photosynthesises and is still Monera.
- Blue-green algae are bacteria, which is why cyanobacteria is the better name.
- Fungi: eukaryotic, mostly multicellular (yeast unicellular), wall of chitin, no chlorophyll, saprophytic or parasitic. Rhizopus, Penicillium, Agaricus, yeast. Lichen is fungus plus alga; mycorrhiza is fungus plus plant roots.
- Plantae: eukaryotic, multicellular, wall of cellulose, chlorophyll present, autotrophic.
- Fungi against plants: chitin against cellulose, and heterotrophic against autotrophic.
- A cell wall alone proves nothing — its composition carries the information.
- Fungi are essential decomposers, returning carbon and nitrogen to the cycles.
- Animalia: eukaryotic, multicellular, no cell wall, heterotrophic, mostly motile with organ systems.
- Symmetry: asymmetrical (sponge), radial (Hydra, starfish), bilateral (most animals). Also divided by coelom and level of organisation.
- Notochord present means chordate; absent means non-chordate. Fish, frog, pigeon and human are chordates; sponge, Hydra, starfish, earthworm and cockroach are not.
- A notochord is not a backbone, and chordate is wider than vertebrate.
- A starfish is radial as an adult and bilateral as a larva, so more than one life stage is considered.
- No cell wall is the fastest animal test. And five kingdoms is a stage, later revised into six kingdoms or three domains.
List ten organisms, place each in a kingdom, and write the single character that decided it — the two that give you most trouble will be the two NEET chooses.
- The five-kingdom system — Monera, Protista, Fungi, Plantae, Animalia — uses cell structure, body organisation and mode of nutrition.
- Monera: prokaryotic, unicellular, wall may be present but not of cellulose, nutrition either mode. Bacteria, blue-green algae (Anabaena), Mycoplasma.
- Protista: eukaryotic, unicellular, often moving by cilia, flagella or pseudopodia. Amoeba, Paramecium, Euglena, diatoms, Plasmodium.
- The nucleus separates Monera from Protista — Anabaena photosynthesises and is still Monera.
- Blue-green algae are bacteria, which is why cyanobacteria is the better name.
- Fungi: eukaryotic, mostly multicellular (yeast unicellular), wall of chitin, no chlorophyll, saprophytic or parasitic. Rhizopus, Penicillium, Agaricus, yeast. Lichen is fungus plus alga; mycorrhiza is fungus plus plant roots.
- Plantae: eukaryotic, multicellular, wall of cellulose, chlorophyll present, autotrophic.
- Fungi against plants: chitin against cellulose, and heterotrophic against autotrophic.
- A cell wall alone proves nothing — its composition carries the information.
- Fungi are essential decomposers, returning carbon and nitrogen to the cycles.
- Animalia: eukaryotic, multicellular, no cell wall, heterotrophic, mostly motile with organ systems.
- Symmetry: asymmetrical (sponge), radial (Hydra, starfish), bilateral (most animals). Also divided by coelom and level of organisation.
- Notochord present means chordate; absent means non-chordate. Fish, frog, pigeon and human are chordates; sponge, Hydra, starfish, earthworm and cockroach are not.
- A notochord is not a backbone, and chordate is wider than vertebrate.
- A starfish is radial as an adult and bilateral as a larva, so more than one life stage is considered.
- No cell wall is the fastest animal test. And five kingdoms is a stage, later revised into six kingdoms or three domains.
List ten organisms, place each in a kingdom, and write the single character that decided it — the two that give you most trouble will be the two NEET chooses.