This section provides important NEET Biology MCQs Ecosystem chapter with correct answers and clear explanations. These questions are designed to help students revise key concepts like energy flow, ecological pyramids, biogeochemical cycles, and succession in a quick and effective way.

NEET Biology MCQs Ecosystem [Free PDF Download]

1. Which ecosystem has the highest gross primary productivity?
a) Rainforests
b) Coral reefs
c) Mangroves
d) Grasslands

Answer: a) Rainforests
Reason: Tropical rainforests receive maximum sunlight and rainfall, leading to very high photosynthesis and biomass production.

2. In primary succession in water, the pioneer species are
a) Free floating angiosperm
b) Small phytoplanktons
c) Rooted hydrophytes
d) Lichens

Answer: b) Small phytoplanktons
Reason: In aquatic succession, microscopic phytoplanktons are the first organisms to colonize.

3. The pyramid of biomass will be inverted in the ecosystem of
a) Forests
b) Ponds
c) Grasslands
d) Drylands

Answer: b) Ponds
Reason: In aquatic ecosystems, phytoplankton have less biomass but reproduce rapidly, supporting larger biomass of consumers.

4. Complete the model of carbon cycle (A, B, C, D, E, F)

a) A-Osmosis, B-Photosynthesis, C-Respiration, D-Burning of fuel wood, E-Forest food chain, F-Limestone
b) A-Photorespiration, B-Respiration, C-Respiration, D-Burning of organic debris, E-Pond food chain, F-Dolomite
c) A-Respiration, B-Photosynthesis, C-Respiration, D-Combustion of fossil fuels, E-Aquatic food chain, F-Coal, oil
d) A-Respiration, B-Photosynthesis, C-Respiration, D-Burning of forest, E-Terrestrial food chain, F-Forest

Answer: c) A-Respiration, B-Photosynthesis, C-Respiration, D-Combustion of fossil fuels, E-Aquatic food chain, F-Coal, oil
Reason: These processes correctly represent carbon exchange and storage in nature.

5. Large unit of land having different types of plants and animals is called
a) Uniform vegetation
b) Biome
c) Ecosystem
d) Niche

Answer: b) Biome
Reason: A biome is a large geographical area with specific climate, flora, and fauna.

6. Which is known as the sedimentary cycle?
a) Carbon cycle
b) Hydrologic cycle
c) Nitrogen cycle
d) Phosphorus cycle

Answer: d) Phosphorus cycle
Reason: Its main reservoir is sedimentary rocks.

7. Communities in near equilibrium are called
a) Climax communities
b) Ecofriendly communities
c) Seral communities
d) Pioneer communities

Answer: a) Climax communities
Reason: These are stable and balanced communities.

8. Dried plant parts and dead remains on soil constitute
I. Below ground detritus
II. Above ground detritus
III. Litter fall

Answer: c) II and III
Reason: Materials falling on soil surface are above-ground detritus and litter.

9. In the following, there is no difference
a) Trophic level-I and herbivores
b) Primary consumers and herbivores
c) Primary carnivores and trophic level-II
d) Secondary consumer and herbivores

NEET Biology MCQs Ecosystem [Free PDF Download]

1. Which ecosystem has the highest gross primary productivity?
a) Rainforests
b) Coral reefs
c) Mangroves
d) Grasslands

2. In primary succession in water, the pioneer species are
a) Free floating angiosperm
b) Small phytoplanktons
c) Rooted hydrophytes
d) Lichens

3. The pyramid of biomass will be inverted in the ecosystem of
a) Forests
b) Ponds
c) Grasslands
d) Drylands

4. Complete the model of carbon cycle (A, B, C, D, E, F)

5. Large unit of land having different types of plants and animals is called
a) Uniform vegetation
b) Biome
c) Ecosystem
d) Niche

6. Which is known as the sedimentary cycle?
a) Carbon cycle
b) Hydrologic cycle
c) Nitrogen cycle
d) Phosphorus cycle

7. Communities in near equilibrium are called
a) Climax communities
b) Ecofriendly communities
c) Seral communities
d) Pioneer communities

8. Dried plant parts and dead remains on soil constitute
I. Below ground detritus
II. Above ground detritus
III. Litter fall

9. In the following, there is no difference
a) Trophic level-I and herbivores
b) Primary consumers and herbivores
c) Primary carnivores and trophic level-II
d) Secondary consumer and herbivores

10. Statements about carbon cycle
I. Carbon is released into the atmosphere
II. Atmospheric input from rainfall is greater
III. Carbon exchange occurs during respiration

11. Ecological pyramids were discovered by
a) Elton
b) Odum
c) Reiter
d) None

12. Plant succession in sandy area is
a) Psammosere
b) Hydrosere
c) Xerosere
d) Lithosere

13. An ecosystem is
a) Interaction of plants, animals, microbes with environment
b) Plants and microbes only
c) Only plants and animals
d) Only surroundings

14. Transfer of energy in a food chain is called
a) Food web
b) Top consumer
c) Energy flow
d) Pyramid of number

15. Energy used for new tissue in autotrophs
a) Gross primary production
b) Decomposition
c) Gross photosynthesis
d) Net primary production

16. Microbes breaking complex organic matter are
a) Producers
b) Decomposers
c) Consumers
d) Symbionts

17. Not used for ecological pyramids
a) Dry weight
b) Number
c) Energy flow
d) Fresh weight

18. Element from weathering of rocks absorbed by plants
a) Phosphorus
b) Carbon
c) Nitrogen
d) Oxygen

19. Pyramid of biomass in aquatic system

Final Note

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Class-wise Solutions

Subject-wise Solutions

NEET BIOLOGY

1. Which ecosystem has the highest gross primary productivity?a) Rainforestsb) Coral reefsc) Mangrovesd) Grasslands

2. In primary succession in water, the pioneer species area) Free floating angiospermb) Small phytoplanktonsc) Rooted hydrophytesd) Lichens

3. The pyramid of biomass will be inverted in the ecosystem ofa) Forestsb) Pondsc) Grasslandsd) Drylands

4. Complete the model of carbon cycle (A, B, C, D, E, F)

5. Large unit of land having different types of plants and animals is calleda) Uniform vegetationb) Biomec) Ecosystemd) Niche

6. Which is known as the sedimentary cycle?a) Carbon cycleb) Hydrologic cyclec) Nitrogen cycled) Phosphorus cycle

7. Communities in near equilibrium are calleda) Climax communitiesb) Ecofriendly communitiesc) Seral communitiesd) Pioneer communities

8. Dried plant parts and dead remains on soil constituteI. Below ground detritusII. Above ground detritusIII. Litter fall

9. In the following, there is no differencea) Trophic level-I and herbivoresb) Primary consumers and herbivoresc) Primary carnivores and trophic level-IId) Secondary consumer and herbivores

10. Statements about carbon cycleI. Carbon is released into the atmosphereII. Atmospheric input from rainfall is greaterIII. Carbon exchange occurs during respiration

11. Ecological pyramids were discovered bya) Eltonb) Odumc) Reiterd) None

12. Plant succession in sandy area isa) Psammosereb) Hydroserec) Xerosered) Lithosere

13. An ecosystem isa) Interaction of plants, animals, microbes with environmentb) Plants and microbes onlyc) Only plants and animalsd) Only surroundings

14. Transfer of energy in a food chain is calleda) Food webb) Top consumerc) Energy flowd) Pyramid of number

15. Energy used for new tissue in autotrophsa) Gross primary productionb) Decompositionc) Gross photosynthesisd) Net primary production

16. Microbes breaking complex organic matter area) Producersb) Decomposersc) Consumersd) Symbionts

17. Not used for ecological pyramidsa) Dry weightb) Numberc) Energy flowd) Fresh weight

18. Element from weathering of rocks absorbed by plantsa) Phosphorusb) Carbonc) Nitrogend) Oxygen

19. Pyramid of biomass in aquatic system

Final Note

🔗 Explore More NEET MCQs (External Resource)

Class-wise Solutions

Subject-wise Solutions

NEET BIOLOGY

1. Which ecosystem has the highest gross primary productivity?
a) Rainforests
b) Coral reefs
c) Mangroves
d) Grasslands

2. In primary succession in water, the pioneer species are
a) Free floating angiosperm
b) Small phytoplanktons
c) Rooted hydrophytes
d) Lichens

3. The pyramid of biomass will be inverted in the ecosystem of
a) Forests
b) Ponds
c) Grasslands
d) Drylands

5. Large unit of land having different types of plants and animals is called
a) Uniform vegetation
b) Biome
c) Ecosystem
d) Niche

6. Which is known as the sedimentary cycle?
a) Carbon cycle
b) Hydrologic cycle
c) Nitrogen cycle
d) Phosphorus cycle

7. Communities in near equilibrium are called
a) Climax communities
b) Ecofriendly communities
c) Seral communities
d) Pioneer communities

8. Dried plant parts and dead remains on soil constitute
I. Below ground detritus
II. Above ground detritus
III. Litter fall

9. In the following, there is no difference
a) Trophic level-I and herbivores
b) Primary consumers and herbivores
c) Primary carnivores and trophic level-II
d) Secondary consumer and herbivores

10. Statements about carbon cycle
I. Carbon is released into the atmosphere
II. Atmospheric input from rainfall is greater
III. Carbon exchange occurs during respiration

11. Ecological pyramids were discovered by
a) Elton
b) Odum
c) Reiter
d) None

12. Plant succession in sandy area is
a) Psammosere
b) Hydrosere
c) Xerosere
d) Lithosere

13. An ecosystem is
a) Interaction of plants, animals, microbes with environment
b) Plants and microbes only
c) Only plants and animals
d) Only surroundings

14. Transfer of energy in a food chain is called
a) Food web
b) Top consumer
c) Energy flow
d) Pyramid of number

15. Energy used for new tissue in autotrophs
a) Gross primary production
b) Decomposition
c) Gross photosynthesis
d) Net primary production

16. Microbes breaking complex organic matter are
a) Producers
b) Decomposers
c) Consumers
d) Symbionts

17. Not used for ecological pyramids
a) Dry weight
b) Number
c) Energy flow
d) Fresh weight

18. Element from weathering of rocks absorbed by plants
a) Phosphorus
b) Carbon
c) Nitrogen
d) Oxygen