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Q. No.A functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment, is called as:
| 1. | A population | 2. | A species |
| 3. | A biological community | 4. | An ecosystem |
Subtopic: Introduction |
89%
Level 1: 80%+
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Consider the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Anthropogenic actions can have significant effect on natural ecosystems. |
| II: | An aquarium is considered as a man made ecosystem. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Components & Types of Ecosystems |
94%
Level 1: 80%+
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Physical structure of an ecosystem:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | is same for all types of ecosystems. |
| II: | is the result of interaction of biotic and abiotic components. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Introduction | ECOSYSTEM – STRUCTURE AND FUNCTION |
66%
Level 2: 60%+
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Vertical distribution of different species occupying different levels in an ecosystem is called:
| 1. | edge effect | 2. | ecotone |
| 3. | stratification | 4. | canopy structure |
Subtopic: Introduction |
96%
Level 1: 80%+
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Energy flow and nutrient cycling are two important components of an ecosystem. What will be true comparison of the two?
| 1. | The amount of energy is much greater than the amount of nutrients |
| 2. | Organisms always need nutrients, but they don't always need energy |
| 3. | Nutrients are recycled, but energy is not |
| 4. | Organisms always need energy, but they don't always need nutrients |
Subtopic: Energy Flow | Nutrient Cycling |
73%
Level 2: 60%+
Hints
Consider the given two statements:
| Assertion (A): | Temperature is the most important abiotic factor affecting living organisms. |
| Reason (R): | Temperature affects enzyme kinetics. |
| 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. |
Subtopic: Introduction |
85%
Level 1: 80%+
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Hints
Of the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | A constant input of solar energy is the basic requirement for almost all ecosystems to function and sustain. |
| II: | There is unidirectional movement of energy towards the higher trophic levels and its dissipation as heat to the environment. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Ecosystem Productivity | Energy Flow |
94%
Level 1: 80%+
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Consider the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Primary production of an ecosystem is expressed in terms of weight (gm–2) or energy (kcal m–2). |
| II: | Productivity of an ecosystem is expressed in terms of gm–2 yr–1 or (kcal m–2) yr–1 . |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Ecosystem Productivity |
90%
Level 1: 80%+
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The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is:
| 1. | Primary production | 2. | Primary productivity |
| 3. | Secondary production | 4. | Secondary productivity |
Subtopic: Ecosystem Productivity |
Level 3: 35%-60%
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Productivity is the rate of production of biomass expressed in terms of :
i.
ii.
iii.
iv.
| 1. | ii | 2. | iii |
| 3. | ii and iv | 4. | i and iii |
Subtopic: Ecosystem Productivity |
85%
Level 1: 80%+
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