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

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

Which of the following is not correctly matched?

1.  Productivity    -    Rate of biomass production

2.  Gross primary productivity of earth    -    Rate of productivity of organic matter during photosynthesis 

3.  Net primary productivity    -    Available biomass for consumption by heterotrophs

4.  Secondary productivity    -     Formation of new organic matter by producers 

The secondary productivity means

1. Rate of increase in the biomass of autotrophs.

2. Rate of increase in the biomass of heterotrophs.

3. The rate at which the organic molecules are used up by an autotroph.

4. The rate at which inorganic molecules are used up by an autotroph.

In an ecosystem, the rate of production of organic matter during photosynthesis is termed as:

1. net primary productivity

2. gross primary productivity

3. secondary productivity

4. net productivity

Net primary productivity is the gross primary productivity minus

1. that which is consumed by herbivores

2. that which is consumed by producer in metabolism

3. secondary productivity 

4. loss due to mortality

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

The mass of living material at a tropic level at a particular time is called

1. Gross primary productivity

2. Standing state

3. Net primary productivity

4. standing crop