The removal of 'Keystone' species will affect:

(1) The producers                     

(2) The consumers

(3) The ecosystem                   

(4) The decomposers

Which of the following is the functional unit of nature?

1. A plant

2. An animal

3. Ecosystem

4. Environment

Identify the odd one out?

1. Forest

2. Grassland

3. Desert

4. Wetland

Which of the following is not a man-made ecosystem?

1. Pond

2. Crop-field

3. Swimming pool

4. Both ‘1’ and ‘3’

Which vertical strata is occupied by trees in a forest?

1. Top

2. Middle

3. Bottom

4. Any of the above.

Which of the following could affect the rate of function of a pond?

1. The solar input

2. The cycle of temperature

3. Day-length

4. All of the above

The basic requirement for any ecosystem to function and sustain is

1. Enormous amount of water

2. Constant input of solar energy

3. Fertile soil

4. Oxygen

The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called as-

1. Biomass production

2. Primary production

3. Secondary production

4. Assimilation

Primary production is expressed in terms of-

1. Grams

2. Grams/year

3. Gram/m²

4. Gram/m²/year

What do you mean by Productivity?
1. Rate of biomass production
2. Amount of biomass production
3. Biomass produced in an area
4. Biomass produced in a time period