Question 1

Which of the following is an example of a terrestrial ecosystem?

Accepted Answer

Forest is a terrestrial ecosystem, whereas pond, aquarium, and lake are examples of aquatic ecosystems. Terrestrial ecosystems are land-based communities of organisms and their interactions with the abiotic environment.

Question 2

The vertical distribution of different species occupying different levels in a biotic community is known as:

Accepted Answer

Stratification refers to the vertical distribution of different species occupying different levels in a biotic community, such as trees occupying top vertical strata, shrubs in the middle, and herbs/grasses at the bottom.

Question 3

The rate of total production of organic matter during photosynthesis is called:

Accepted Answer

Gross primary productivity (GPP) is the rate of total production of organic matter during photosynthesis. A considerable amount of GPP is utilized by plants in respiration.

Question 4

Net primary productivity (NPP) is given by the formula:

Accepted Answer

Net primary productivity (NPP) is the gross primary productivity minus respiration losses (R). Formula: NPP = GPP - R.

Question 5

Primary productivity depends on:

Accepted Answer

Primary productivity depends on the plant species inhabiting a particular area, environmental factors, availability of nutrients, and photosynthetic capacity of plants.

Ecosystem — CBSE Class 12 Biology Important Questions & Revision Notes