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

Secondary productivity is defined with respect to-

1. Producers

2. Consumers

3. Ratio of producers and consumers

4. Trophic level

Primary productivity of an terrestrial ecosystem depends upon

1. Photosynthetic capacity of plants.

2. A variety of environmental factors,

3. Availability of nutrients

4. All of the above.

What is the annual net primary productivity of the whole biosphere

1. 160 billion tons

2. 170 billion tons

3. 177 billion tons

4. 190 billion tons