Ecosystem
5 Board Biology previous year questions on Ecosystem — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.
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.
Choose the correct answer from the options given below:
A, B, C only
Correct answer: Option B – A, B, C only
Explanation:
Statement A is correct because detritivores, such as earthworms, perform fragmentation, breaking detritus into smaller particles and increasing the surface area for microbial action.
Statement B is correct since humus, formed during decomposition, is further degraded by microorganisms during the process of mineralisation, leading to the release of inorganic nutrients.
Statement C is also correct because leaching involves the downward movement of water-soluble inorganic nutrients into the soil horizons, where they may get precipitated as unavailable salts.
Statement D is incorrect as the detritus food chain begins with dead organic matter, not living organisms.
Statement E is incorrect because earthworms carry out fragmentation, not catabolism; catabolism is performed by microbial enzymes.
Thus, the correct set is A, B, and C → Option B.
Encrgy cnters the Ecosystem through which trophic level ?
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SECTION-A
Objective Type Question , Each Carry one Marks
The most dangerous reason for the existence of lives is
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Match List-I with List-II:
| List-I | List-II |
|---|---|
| (A) Standing state | (I) Available biomass for the consumption of heterotrophs |
| (B) Secondary productivity | (II) Rate of formation of organic matter by consumers |
| (C) Standing crop | (III) Mass of living matter in a trophic level at a given time |
| (D) Net primary productivity | (IV) Amount of mineral nutrients in the soil at a given time |
Choose the correct answer from the options given below :
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What is the percentage of photosynthetically active radiation (PAR) captured by plants for synthesis of organic matters?
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