Identify the correct statements:
A. Detrivores perform fragmentation.
B. The humus is further degraded by some microbes during mineralization.
C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.
D. The detritus food chain begins with living organisms.
E. Earthworms break down detritus into smaller particles by a process called catabolism.

NEET-2023 [Ecosystem] [class-xii ]

• D, E, A only
• A, B, C only
• B, C, D only
• C, D, E only
Correct Option: B  [ A, B, C only ]

Remark:

In the equation GPP – R = NPP
GPP is Gross Primary Productivity
NPP is Net Primary Productivity.

R here is:

NEET-2023 [Ecosystem] [class-xii ]

• Reproductive allocation
• Photosynthetically active radiation
• Respiratory quotient
• Respiratory loss
Correct Option: D  [ Respiratory loss ]

Remark:

Given below are two statements:
Statement I: Decomposition is a process in which the detritus is degraded into simpler substances by microbes.
Statement II: Decomposition is faster if the detritus is rich in lignin and chitin.
In the light of the above statements, choose the correct answer from the options given below:

NEET-2022 [Ecosystem] [class-xii ]

• Both Statement I and Statement II are correct
• Both Statement I and Statement II are incorrect
• Statement I is correct but Statement II is incorrect
• Statement I is incorrect but Statement II is correct
Correct Option: C  [ Statement I is correct but Statement II is incorrect ]

Remark:

Which one of the following will accelerate phosphorus cycle?

NEET-2022 [Ecosystem] [class-xii ]

• Burning of fossil fuels
• Volcanic activity
• Weathering of rocks
• Rain fall and storms
Correct Option: C  [ Weathering of rocks ]

Remark:

Detritivores breakdown detritus into smaller particles. This process is called:

NEET-2022 [Ecosystem] [class-xii ]

• Fragmentation
• Humification
• Decomposition
• Catabolism
Correct Option: A  [ Fragmentation ]

Remark:

The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as:

NEET-2021 [Ecosystem] [class-xii ]

• Climax
• Climax community
• Standing state
• Standing crop
Correct Option: C  [ Standing state ]

Remark:

Which of the following statements is not correct?

NEET-2021 [Ecosystem] [class-xii ]

• Pyramid of biomass in sea is generally inverted.
• Pyramid of biomass in sea is generally upright.
• Pyramid of energy is always upright.
• Pyramid of numbers in a grassland ecosystem is upright.
Correct Option: B  [ Pyramid of biomass in sea is generally upright. ]

Remark:

In the equation GPP–R = NPP.
R represents:

NEET-2021 [Ecosystem] [class-xii ]

• Radiant energy
• Retardation factor
• Environment factor
• Respiration losses
Correct Option: D  [ Respiration losses ]

Remark:

Match the trophic levels with their correct species examples in grassland ecosystem.

NEET-(Sept)2020 [Ecosystem] [class-xii ]

• (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
• (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
• (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
• (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
Correct Option: A  [ (A)-(II), (B)-(III), (C)-(IV), (D)-(I) ]

Remark:

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

NEET-(Sept)2020 [Ecosystem] [class-xii ]

• Gross primary productivity is always less than net primary productivity.
• Gross primary productivity is always more than net primary productivity.
• Gross primary productivity and Net primary productivity are one and same.
• There is no relationship between Gross primary productivity and Net primary productivity.
Correct Option: B  [ Gross primary productivity is always more than net primary productivity. ]

Remark: