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Q. No.Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?
1.
Level PC is insects and level SC is small insectivorous birds
2.
Level PP is phytoplanktons in the sea and Whale on top-level TC
3.
Level PP is pipal trees and the level SC is sheep
4.
Level PC is rats and level SC is cats
Subtopic: Ecological Pyramids |
52%
Level 3: 35%-60%
AIPMT - 2012
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Subtopic: Ecological Pyramids |
Level 3: 35%-60%
AIPMT - 2012
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Identify the incorrect statement regarding primary productivity in an ecosystem?
| 1. | It occurs only through the process of photosynthesis. |
| 2. | Almost all life on Earth relies directly or indirectly on primary production. |
| 3. | Net primary production is available for consumption by herbivores. |
| 4. | Gross primary productivity minus the respiratory loss is the net primary productivity. |
Subtopic: Ecosystem Productivity |
55%
Level 3: 35%-60%
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Which of the following ecosystems are expected to have the least productivity?
1. Tundras
2. Tropical rain forests
3. Open oceans
4. Swamps and marshes
1. Tundras
2. Tropical rain forests
3. Open oceans
4. Swamps and marshes
Subtopic: Ecosystem Productivity |
Level 3: 35%-60%
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After the primary producer level in an ecosystem:
| 1. | less and less amount of new chemical energy is added at successive trophic levels |
| 2. | no new chemical energy is added at successive trophic levels |
| 3. | more and more amount of new chemical energy is added at successive trophic levels |
| 4. | less amount of new chemical energy is added at primary consumer level and then the amount of new chemical energy added to successive levels becomes more and more |
Subtopic: Energy Flow |
Level 3: 35%-60%
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During the decomposition of detritus, the correct chronological sequence of steps involved is:
| 1. | Fragmentation → Leaching → Catabolism |
| 2. | Catabolism → Leaching → Fragmentation |
| 3. | Leaching → Fragmentation → Catabolism |
| 4. | There is no sequence as all steps occur simultaneously |
Subtopic: Decomposition |
Level 3: 35%-60%
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Regarding energy flow in an ecosystem:
| 1. | About 2 to 10 % of incident solar radiation is PAR |
| 2. | An ecosystem is exempt from the Second Law of Thermodynamics |
| 3. | The amount of energy increases at successive trophic levels |
| 4. | The number of trophic levels in a grazing food chain is limited |
Subtopic: Energy Flow |
55%
Level 3: 35%-60%
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The net primary productivity of oceans is about:
| 1. | 25 % of the annual net primary productivity of the whole biosphere |
| 2. | 33 % of the annual net primary productivity of the whole biosphere |
| 3. | 66 % of the annual net primary productivity of the whole biosphere |
| 4. | 70 % of the annual net primary productivity of the whole biosphere |
Subtopic: Ecosystem Productivity |
58%
Level 3: 35%-60%
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Which of the following is not correct regarding the decomposition of wastes?
| (a) | Low temperature inhibits decomposition |
| (b) | Warm and moist environment favors the process |
| (c) | The process is anaerobic |
| (d) | It is slower if detritus is rich in proteins and carbohydrates |
| (e) | Detritus is degraded into simpler inorganic substance by fungal and bacterial enzymes |
Choose the correct answer from the options given below:
| 1. | (b) and (c) only | 2. | (c), (a) and (d) only |
| 3. | (c) and (d) only | 4. | (c), (d) and (e) only |
Subtopic: Decomposition |
62%
Level 2: 60%+
NEET - 2022
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The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called:
1. Secondary production
2. Primary production
3. Gross primary production
4. Net primary production
1. Secondary production
2. Primary production
3. Gross primary production
4. Net primary production
Subtopic: Ecosystem Productivity |
56%
Level 3: 35%-60%
NEET - 2022
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