Total amount of energy trapped by green plants in food is called:
1.  Gross primary production
2.  Net primary production
3.  Standing crop
4.  Standing state

Which of the following is expected to have the highest value (gm/$m^2$ /yr) in a grassland ecosystem: 

1. Tertiary production

2. Gross production (GP)

3. Net production (NP)

4. Secondary production 

The biomass available for consumption by the herbivores and the decomposers is called:

1. net primary productivity

2. secondary productivity

3. standing crop

4. gross primary productivity

Productivity is the rate of production of biomass expressed in

(i) kcal m^-3 yr^-1
(ii) gm^-2 yr^-1
(iii) g^-1 yr^-1
(iv) kcal m^-2 yr^-1

1. (ii)

2. (iii)

3. (ii) and (iv)

4. (i) and (iii)

In the equation GPP – R = NPP,  R represents:
1. Environment factor
2. Respiration losses
3. Radiant energy
4. Retardation factor

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

Secondary productivity is the rate of formation of new organic matter by:

1. Parasite

2. Consumer

3. Decomposer

4. Producer

The rate of formation of new organic matter by rabbits in grassland is called: 

1. Secondary productivity 

2. Net primary productivity 

3. Gross primary productivity 

4. Net productivity