Q.19 Edaphic factor refers to

1. water

2. soil

3. relative humidity

4. altitude

Q.18 The zone at the edge of a lake or ocean which is alternatively exposed to
air and immersed in water is called

1. pelagic zone

2. benthic zone

3. lentic zone

4. littoral zone

Q. 17 Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100mm

1. Grassland

2. Shrubby forest

3. Desert

4. Mangrove

If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be

1. scavenger

2. tertiary producer

3. tertiary consumer

4. secondary consumer

The sequence of communities of primary succession in water is

Q.12 Climax community is in a state of

1. non-equilibrium

2. equilibrium

3. disorder

4. constant change

During the process of ecological succession, the changes that take place in communities are

1. orderly and sequential

2. random

3. very quick

4. not influenced by the physical environment

How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?

1. 1%

2. 10%

3. 40%

4. 90%

Among the following where do you think the process of decomposition would be the fastest?

1. Tropical rain forest

2. the Antarctic

3. Dry arid region

4. Alpine region

Approximately how much of the solar energy that falls on the leaves of the plant is converted to chemical energy by photosynthesis?

1. Less than 1%

2. 2-10%

3. 30%

4. 50%