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Q. No.Out of the total cost of various ecosystem services, which of the following accounts for maximum per cent?
1. nutrient cycling
2. soil formation
3. climate regulation
4. recreation
75%
Level 2: 60%+
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The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter. Of this, the productivity of the oceans is:
1. 55 billion tons.
2. 70 billion tons.
3. 100 billion tons.
4. 120 billion tons.
1. 55 billion tons.
2. 70 billion tons.
3. 100 billion tons.
4. 120 billion tons.
Subtopic: Ecosystem Productivity |
89%
Level 1: 80%+
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What percent of the total incident solar radiation is captured by plants?
| 1. | 1 to 5 | 2. | 2 to 10 |
| 3. | 20 to 30 | 4. | 40 to 60 |
Subtopic: Energy Flow |
Level 3: 35%-60%
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In ecological succession:
| 1. | Hydrarch succession leads to xeric conditions. |
| 2. | Xerarch succession leads to hydric conditions. |
| 3. | Both xerarch and hydrarch successions may lead to either xeric or hydric conditions. |
| 4. | Both xerarch and hydrarch successions lead to mesic conditions. |
85%
Level 1: 80%+
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Consider the given two statements:
| Assertion (A): | Heterotrophs generally have high energy conversion efficiencies when compared to those of plants. |
| Reason (R): | At higher trophic levels, the respiratory costs are dramatically reduced. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) correctly explains (R) |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 4. | Both (A) and (R) are False |
Subtopic: Energy Flow |
52%
Level 3: 35%-60%
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Rate of formation of new organic matter by consumers is called as:
1. Gross primary productivity
2. Net primary productivity
3. Secondary productivity
4. Tertiary productivity
1. Gross primary productivity
2. Net primary productivity
3. Secondary productivity
4. Tertiary productivity
Subtopic: Ecosystem Productivity |
85%
Level 1: 80%+
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Consider the two given statements:
| Assertion (A): | Secondary succession is faster than the primary succession. |
| Reason (R): | Soil is already there at the time of secondary succession. |
| 1. | Both (A) and (R) are True and (R) correctly explains the (A) |
| 2. | (A) is True but (R) is False |
| 3. | (A) is False but (R) is True |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A) |
89%
Level 1: 80%+
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In the equation
GPP is Gross Primary Productivity. NPP is net Primary Productivity. R here is ___________
1. Reproductive allocation
2. Photosynthetically active radiation
3. Respiratory quotient
4. Respiratory loss
GPP is Gross Primary Productivity. NPP is net Primary Productivity. R here is ___________
1. Reproductive allocation
2. Photosynthetically active radiation
3. Respiratory quotient
4. Respiratory loss
Subtopic: Ecosystem Productivity |
89%
Level 1: 80%+
NEET - 2023
Hints
Identify the correct statements:
Choose the correct answer from the options given below:
| 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:
| 1. | D, E, A only | 2. | A, B, C only |
| 3. | B, C, D only | 4. | C, D, E only |
Subtopic: Decomposition |
84%
Level 1: 80%+
NEET - 2023
Hints
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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