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Q. No.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  The plants that are early seral species also tend to be wind-pollinated rather than insect-pollinated.
Reason (R):  They are often photosynthetic plants.

In the light of the above statements, choose the most appropriate answer from the options given below:

1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

 62%
Level 2: 60%+
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Secondary succession is usually faster than primary succession. 
Reason (R):  Secondary succession is a process started by an event that reduces an already established ecosystem.

In the light of the above statements, choose the most appropriate answer from the options given below:

1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Level 3: 35%-60%
Hints
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Low temperature and anaerobiosis inhibit decomposition resulting in build-up of organic chemicals. 
Reason (R):  Most decomposers are anaerobic psychrophiles.

In the light of the above statements, choose the most appropriate answer from the options given below:

1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Decomposition |
 56%
Level 3: 35%-60%
Hints
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Sometimes the term "detritivore" is used interchangeably with:

1.decomposers2.primary consumers
3.secondary consumers4.autotrophs

Subtopic:  Decomposition |
 90%
Level 1: 80%+
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The minimum requirement for an ecosystem to recycle nutrients present in it would be:

1.  producers
2.  producers and decomposers
3.  producers, primary consumers, and decomposers
4.  producers, primary consumers, secondary consumers, and decomposers
Subtopic:  Decomposition |
 53%
Level 3: 35%-60%
Hints

The best way to describe an ecosystem would be that they are:

1.  processors of energy and transformers of matter.
2.  processors of matter and transformers of energy.
3.  processors of matter and energy.
4.  transformers of matter but not of energy.

Subtopic:  Introduction |
 73%
Level 2: 60%+
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The amount of carbon dioxide in the atmosphere is:
1. increasing
2. decreasing
3. holding steady
4. fluctuating wildly

 82%
Level 1: 80%+
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The ecosystem that can survive in the absence of the Sun would be:

1.tropical rainforest2.tundra
3.benthic ocean4.desert

Subtopic:  Components & Types of Ecosystems | Energy Flow |
 82%
Level 1: 80%+
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The generation of biomass of heterotrophic (consumer) organisms in a system is termed:

1.biogeochemical cycles2.net primary productivity
3.gross primary productivity4.secondary productivity

Subtopic:  Ecosystem Productivity |
 80%
Level 1: 80%+
Hints
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Converting nitrate to nitrogen gas by anaerobes like Pseudomonas is:

1.nitrogen fixation2.ammonification
3.denitrification4.eutrophication

 70%
Level 2: 60%+
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