Multiple Choice Questions (MCQs) for NEET Biology: Ecosystem
Review structured MCQ sets for NEET Biology Ecosystem. Built according to official NEET guidelines, these downloadable questions support daily revision and core concept reinforcement.
Practice Ecosystem MCQs for NEET Biology
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Multiple Choice Questions
(a) Productivity and decomposition
(b) Decomposition and energy flow
(c) Productivity and energy flow
(d) Productivity, decomposition, energy flow and nutrient cycling
Show Answer & Explanation
Answer: (d) Productivity, decomposition, energy flow and nutrient cycling
Explanation:
1. The four aspects together make the ecosystem function as a unit.
2. They are productivity, decomposition, energy flow and nutrient cycling.
Teacher's Note:
1. Ecosystems are studied through these aspects.
(a) Plant species inhabiting a particular area
(b) Predation
(c) Environmental factors
(d) Photosynthetic capacity
Show Answer & Explanation
Answer: (b) Predation
Explanation:
1. Primary productivity depends on plant species, environmental factors and photosynthetic capacity.
2. Predation by consumers is not a determinant.
Teacher's Note:
1. Productivity is the rate of biomass production.
(a) 170 billion tons (dry weight)
(b) 50 billion tons
(c) 55 billion tons
(d) 710 billion tons
Show Answer & Explanation
Answer: (a) 170 billion tons (dry weight)
Explanation:
1. The annual net primary productivity of the biosphere is about 170 billion tons of organic matter (dry weight).
2. The other values are for parts of it.
Teacher's Note:
1. Oceans contribute only about a third.
(a) 50
(b) 70
(c) 42
(d) 55
Show Answer & Explanation
Answer: (d) 55
Explanation:
1. Of the 170 billion tons, the oceans contribute only 55 billion tons.
2. The remaining 115 billion tons are from land.
Teacher's Note:
1. Oceans cover 70 percent of the earth's surface but have low productivity.
(a) Increasing porosity of detritus
(b) Increasing surface area of detritus
(c) Increasing the rate of sedimentation
(d) All of these
Show Answer & Explanation
Answer: (b) Increasing surface area of detritus
Explanation:
1. Fragmentation by detritivores increases the surface area for microbial action.
2. This speeds up decomposition.
Teacher's Note:
1. Earthworms are detritivores.
(a) Susceptible to microbial action
(b) Undergoes decomposition at an extremely high rate
(c) Colloidal in nature
(d) It promotes compaction of the soil
Show Answer & Explanation
Answer: (c) Colloidal in nature
Explanation:
1. Humus is a dark amorphous, colloidal substance.
2. It is highly resistant to microbial action, decomposes very slowly and acts as a reservoir of nutrients.
Teacher's Note:
1. Humus helps soil structure.
(a) Lignin
(b) Chitin
(c) Cutin
(d) Sugars
Show Answer & Explanation
Answer: (d) Sugars
Explanation:
1. Detritus rich in lignin, chitin and cutin decomposes slowly.
2. Sugars and nitrogen-rich detritus decompose quickly.
Teacher's Note:
1. Composition of detritus affects decay.
(a) Temperature and soil moisture
(b) Temperature and pH of soil
(c) Temperature and oxygen
(d) pH of soil and oxygen
Show Answer & Explanation
Answer: (a) Temperature and soil moisture
Explanation:
1. Temperature and soil moisture regulate decomposition by controlling activity of soil microbes.
2. These are the major climatic factors.
Teacher's Note:
1. Warm and moist conditions favour decomposition.
(a) A warm and moist environment favours decomposition
(b) Nitrogen and sugar components favour decomposition
(c) Low temperature and anaerobiosis favour decomposition
(d) Decomposition is largely an oxygen requiring process
Show Answer & Explanation
Answer: (c) Low temperature and anaerobiosis favour decomposition
Explanation:
1. Low temperature and anaerobic conditions inhibit decomposition and lead to accumulation of organic matter.
2. Warm, moist and aerobic conditions favour it.
Teacher's Note:
1. Decomposition is largely aerobic.
(a) 0.5 to 2 percent
(b) 2 to 10 percent
(c) 20 to 30 percent
(d) 50 percent
Show Answer & Explanation
Answer: (b) 2 to 10 percent
Explanation:
1. Of incident solar radiation, less than 50 percent is PAR.
2. Plants capture only 2 to 10 percent of the PAR.
Teacher's Note:
1. This explains the limited productivity.
(a) Grazing food chain
(b) Parasitic food chain
(c) Detritus food chain
(d) Both grazing and detritus food chains
Show Answer & Explanation
Answer: (a) Grazing food chain
Explanation:
1. In aquatic ecosystems the grazing food chain (GFC) is the major conduit of energy flow.
2. In terrestrial ecosystems a much larger fraction flows through the detritus food chain.
Teacher's Note:
1. Phytoplankton are the producers.
(a) In an aquatic ecosystem the GFC is the major conduit for energy flow
(b) In a terrestrial ecosystem the DFC is the major conduit
(c) In a predator food chain the size of organisms increases with trophic level
(d) DFC can never be connected with GFC
Show Answer & Explanation
Answer: (d) DFC can never be connected with GFC
Explanation:
1. Detritus food chains are connected to grazing food chains at some levels.
2. For example, some organisms of the DFC are prey for GFC animals, so the statement is incorrect.
Teacher's Note:
1. Food chains in nature interconnect as food webs.
(a) Fresh weight
(b) Dry weight
(c) Both fresh and dry weight
(d) Kcal per square metre per year
Show Answer & Explanation
Answer: (b) Dry weight
Explanation:
1. Fresh weight varies with water content.
2. Dry weight is therefore more accurate.
Teacher's Note:
1. Biomass is measured as fresh or dry weight.
(a) 708000
(b) 354000
(c) 3
(d) 30000
Show Answer & Explanation
Answer: (c) 3
Explanation:
1. In the pyramid of numbers of a grassland, there are about 5842000 producers, 708000 primary consumers, 354000 secondary consumers and only 3 tertiary consumers.
2. So 3 top consumers are supported.
Teacher's Note:
1. The pyramid is upright.
(a) They do not take into account the same species belonging to two or more trophic levels
(b) They do not accommodate a food web
(c) Saprophytes are not given any place in pyramids
(d) All of the above
Show Answer & Explanation
Answer: (d) All of the above
Explanation:
1. Pyramids assume a simple food chain, never a food web.
2. They ignore species that belong to more than one trophic level and saprophytes.
Teacher's Note:
1. These are listed limitations.
(a) Bioprospecting
(b) Biofortification
(c) Ecological succession
(d) Ecological assessment
Show Answer & Explanation
Answer: (c) Ecological succession
Explanation:
1. Succession is a gradual, fairly predictable change in species composition of an area.
2. The other terms are unrelated.
Teacher's Note:
1. Succession ends in a climax community.
(a) Increase in the number of species
(b) Increase in the number of individuals of species
(c) Increase in biomass
(d) Decrease in niche specialisation
Show Answer & Explanation
Answer: (d) Decrease in niche specialisation
Explanation:
1. During succession, species diversity, biomass and number of individuals increase.
2. Niche specialisation also increases, so a decrease is not characteristic.
Teacher's Note:
1. Succession stabilises at climax.
(a) In xerosere, xeric conditions progress to hydric conditions
(b) In hydrosere, mesic environment progresses to hydric conditions
(c) In hydrosere, hydric environment progresses to mesic conditions
(d) Abandoned farm lands show primary succession
Show Answer & Explanation
Answer: (c) In hydrosere, hydric environment progresses to mesic conditions
Explanation:
1. In hydrosere, succession starts in water and ends in a mesic climax community.
2. Abandoned farmland shows secondary succession.
Teacher's Note:
1. Xerosere goes from xeric to mesic.
(a) Hydric
(b) Xeric
(c) Mesic
(d) Halophytic
Show Answer & Explanation
Answer: (c) Mesic
Explanation:
1. Succession in water and on dry land tends to a medium water conditions community.
2. This is a mesic climax.
Teacher's Note:
1. Climate determines the climax.
(a) Soil
(b) Moisture
(c) pH and temperature
(d) All of the above
Show Answer & Explanation
Answer: (d) All of the above
Explanation:
1. The rate of release of nutrients is regulated by soil, moisture, pH and temperature.
2. So all are correct.
Teacher's Note:
1. Nutrient cycles are biogeochemical.
(a) 49
(b) 71
(c) 30
(d) 20
Show Answer & Explanation
Answer: (a) 49
Explanation:
1. Carbon constitutes about 49 percent of the dry weight of organisms.
2. It is next to water in abundance in living organisms.
Teacher's Note:
1. Carbon is fixed by photosynthesis.
(a) 2 x 10^13 kg
(b) 4 x 10^13 kg
(c) 5 x 10^13 kg
(d) 6 x 10^13 kg
Show Answer & Explanation
Answer: (b) 4 x 10^13 kg
Explanation:
1. About 4 x 10^13 kg of carbon is fixed annually in the biosphere.
2. This is the amount used in photosynthesis.
Teacher's Note:
1. Carbon returns through respiration and decomposition.
(a) Generation of fertile soil
(b) Wildlife habitat formation
(c) Products of antibiotics
(d) Crop pollination
Show Answer & Explanation
Answer: (c) Products of antibiotics
Explanation:
1. Soil formation, habitat and pollination are services of ecosystems.
2. Antibiotics are products made from microbes, not a regulating service.
Teacher's Note:
1. Ecosystem services are the benefits ecosystems provide.
(a) Fundamental ecosystem services are worth about 33 trillion US dollars per year
(b) Soil formation is about 16.5 trillion dollars
(c) Nutrient cycling is less than 3.3 trillion dollars
(d) Climate regulation is 5 trillion dollars
Show Answer & Explanation
Answer: (d) Climate regulation is 5 trillion dollars
Explanation:
1. Total value is about 33 trillion dollars, soil formation is about 50 percent and nutrient cycling less than 10 percent.
2. Climate regulation is only about 6 percent, around 2 trillion dollars, not 5 trillion.
Teacher's Note:
1. The value is nearly twice the global GNP.
Practice MCQs for NEET Biology Ecosystem
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FAQs
You can get most exhaustive NEET Biology Ecosystem MCQs Set 06 for free on StudiesToday.com. These MCQs for NEET Biology are updated for the 2026-27 academic session as per NEET examination standards.
Yes, our NEET Biology Ecosystem MCQs Set 06 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the NEET paper is now competency-based.
By solving our NEET Biology Ecosystem MCQs Set 06, NEET students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Biology.
Yes, Biology MCQs for NEET have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused NEET exams.
Yes, you can also access online interactive tests for NEET Biology Ecosystem MCQs Set 06 on StudiesToday.com as they provide instant answers and score to help you track your progress in Biology.