1. | A population | 2. | A species |
3. | A biological community | 4. | An ecosystem |
I: | Anthropogenic actions can have significant effect on natural ecosystems. |
II: | An aquarium is considered as a man made ecosystem. |
I: | is same for all types of ecosystems. |
II: | is the result of interaction of biotic and abiotic components. |
1. | edge effect | 2. | ecotone |
3. | stratification | 4. | canopy structure |
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 |
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. |
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. |
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 . |
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 |