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 22

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Which of the following phenomenon is not related to change during ecological succession?

50% studentsanswered this correctly

Important Questions on Ecosystem

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 23

One of the differences between carbon and phosphorus cycles is that in the latter

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 24

Phosphorus cycle differs from carbon cycle in

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 25

Choose the option that correctly fills in the blanks for seral stages A, B, and C.

Phytoplankton – Submerged plant stage – A – B – Marsh meadow stage – C – Forest stage

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 26

Organisms which are associated with first as well as third trophic level are

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 27

Bacteria are essential in carbon cycle as:

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 28

Go through the following processes of decomposition.

A. Humification: Process of formation of dark-coloured amorphous, slightly acidic substances, which are highly resistant to microbial action.

B. Fragmentation: Carried out by earthworms and termites.

C. Catabolism: Carried out by microorganisms under fully anaerobic conditions, by their extracellular enzymes.

D. Leaching: Water-soluble organic nutrients go down into the soil layers and get precipitated.

The correctly described processes are:

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 29

Humans benefit from ecosystems because ecosystems provide

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Biology Crash Course NEET>Chapter 36 - Ecosystem>Level 2>Q 30

The number of transitional communities in the hydrosere is

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