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Q. No.Assertion(A): The ecosystem services are largely taken for granted.
Reason(R): Researchers have put an average price tag of US $ 33 trillion a year on these fundamental ecosystems services.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
67%
Level 2: 60%+
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Assertion(A): Secondary succession takes a longer time to establish a climax community compared to primary succession.
Reason(R): Soil and sediments are already present in the areas where secondary succession happens.
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. (A) is false, but (R) is true.
Reason(R): Soil and sediments are already present in the areas where secondary succession happens.
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. (A) is false, but (R) is true.
79%
Level 2: 60%+
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Match List - I with List - II
Choose the correct answer from the options given below:
| List - I | List - II | ||
| (A) | Hydrarch succession | (I) | Gradual change in the species composition |
| (B) | Xerarch succession | (II) | Faster and climax reached quickly |
| (C) | Ecological succession | (III) | Lichens to mesic conditions |
| (D) | Secondary succession | (IV) | Phytoplankton to mesic conditions |
| Options: | (A) | (B) | (C) | (D) |
| 1. | IV | II | III | I |
| 2. | III | I | IV | II |
| 3. | I | IV | II | III |
| 4. | IV | III | I | II |
71%
Level 2: 60%+
NEET - 2023
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The amount of nutrients such as carbon, nitrogen, potassium and calcium present in the soil at any given time is referred to as:
| 1. | Standing state | 2. | Standing crop |
| 3. | Humus | 4. | Detritus |
64%
Level 2: 60%+
NEET - 2023
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Assertion(A): The present-day communities in the world have come to be because of succession that has occurred over millions of years since life started on earth.
Reason(R): Succession and evolution would have been parallel processes at that time.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Reason(R): Succession and evolution would have been parallel processes at that time.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
72%
Level 2: 60%+
Hints
Assertion(A): In secondary succession, the rate of succession is much faster and the climax is also reached more quickly.
Reason(R): Soil is already there in the ecosystems undergoing secondary succession.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Reason(R): Soil is already there in the ecosystems undergoing secondary succession.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
86%
Level 1: 80%+
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Assertion(A): Both hydrarch and xerarch successions lead to medium water conditions (mesic) – neither too dry (xeric) nor too wet (hydric).
Reason(R): Xerarch succession takes place in dry areas and the series progress from xeric to hydric conditions.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Reason(R): Xerarch succession takes place in dry areas and the series progress from xeric to hydric conditions.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
67%
Level 2: 60%+
Hints
Assertion(A): Succession is a process that starts in an area where no living organisms are there.
Reason(R): Succession and evolution are parallel processes.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Reason(R): Succession and evolution are parallel processes.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
68%
Level 2: 60%+
Hints
Match the List-I with List-II
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (a) | Carbon dissolved in oceans | (i) | 55 billion tons |
| (b) | Annual fixation of carbon through photosynthesis | (ii) | 71% |
| (c) | PAR captured by plants | (iii) | \(4 \times 10^3 \)kg |
| (d) | Productivity of oceans | (iv) | 2 to 10% |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iv) | (iii) | (i) |
| 2. | (iii) | (iv) | (ii) | (i) |
| 3. | (ii) | (iii) | (iv) | (i) |
| 4. | (iii) | (ii) | (i) | (iv) |
Subtopic: Ecosystem Productivity |
86%
Level 1: 80%+
NEET - 2022
Hints
All successions irrespective of the habitat proceed to which type of climax community ?
1. Xeric
2. Mesic
3. Hydrophytic
4. Edaphic
1. Xeric
2. Mesic
3. Hydrophytic
4. Edaphic
80%
Level 1: 80%+
NEET - 2022
Hints
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