The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called as-
a. Biomass production
b. Primary production
c. Secondary production
d. Assimilation

Primary production is expressed in terms of-
a. Grams
b. Grams/year
c. Gram/m²
d. Gram/m²/year

What do you mean by Productivity?
a. Rate of biomass production
b. Amount of biomass production
c. Biomass produced in an area
d. Biomass produced in a time period

Which of the following statement is incorrect?
(1). Gross primary productivity is the rate of production of organic matter during photosynthesis.
(2). Net primary productivity plus respiration losses, is the gross primary productivity.
(3). Gross primary productivity is defined for an ecosystem
(4). Gross primary productivity is the available biomass for the consumption to heterotrophs.

Secondary productivity is defined with respect to-
a. Producers
b. Consumers
c. Ratio of producers and consumers
d. Trophic level

Primary productivity of an terrestrial ecosystem depends upon
a. Photosynthetic capacity of plants.
b. A variety of environmental factors,
c. Availability of nutrients
d. All of the above.

What is the annual net primary productivity of the whole biosphere
a. 160 billion tons
b. 170 billion tons
c. 177 billion tons
d. 190 billion tons

Which of the following contributes the maximum to the net primary productivity?
a. Ocean ecosystem
b. Land ecosystem
c. Pond ecosystem
d. Man-made ecosystem

Why do we call the earthworm as the farmer’s friend?
a. It eats the pests
b. It prevents the growth of weeds
c. Makes the soil fertile by burrowing
d. They help in the breakdown of complex organic matter as well as in loosening of the soil.

Which of the following is not a step in the process of decomposition?
a. Fragmentation
b. Leaching
c. Anabolism
d. Humification.