Choose the right sequence of hydrarch succession from the following:

phytoplankton - submerged plant stage - submerged free floating stage - reed swamp stage - marsh meadow stage - scrub stage - forest

phytoplankton - reed swamp stage submerged plant stage - marsh meadow stage - submerged free floating stage - scrub stage - forest

phytoplankton - submerged free floating stage - reed swamp stage - submerged plant stage-marsh meadow stage - scrub stage - forest

phytoplankton - reed swamp stagesubmerged plant stage - submerged free floating stage- marsh meadow stage -scrub stage - forest

Identify the correct statement from the following.

Decomposition events such as fragmentation, leaching, catabolism, humification and mineralisation all occur simultaneously

In terrestrial ecosystem Grazing food chain is the major one

In aquatic ecosystem Detritus food chain is the major one

Annual net primary productivity from sea is around 55 Million tons

In an ecosystem, the population of:

Primary producers are larger than primary consumers

Secondary consumers are largest

Primary consumers out numbers primary producers

Primary consumers are least dependent upon primary producers

Assertion ( A ): A primary succession is more common than secondary succession. Reason ( R ): Biogeochemical cycling is absent in secondary succession.

Both A and R are correct and R is the correct explanation for A

Both A and R are correct and R is not correct explanation for A

E M B I B E

Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 47

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Earn 100

Which of the food chains will be represented by spindle-shaped pyramid of numbers?

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Important Questions on Ecosystem

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 48

Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 49

Read the following statements and select the correct ones.
(i) A given species may occupy more than one trophic level in the same ecosystem at the same time.
(ii) Productivity of an aquatic ecosystem is less than that of a terrestrial ecosystem.
(iii) Producers constitute the first trophic level of a detritus food chain.

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 50