Construct an age pyramid which reflects a stable growth status of human population.

The number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration is known as

• Emigration

• Mortality

• Natality

• Immigration

• Immigration

Study the graph given below and answer the questions that follow:

(i) Write the status of food and space in the curves (a) and (b).

(ii) In the absence of predators, which one of the two curves would appropriately depict the prey population?
(iii) Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line.

In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

• Stabilizing Selection

• Disruptive Selection

• Cyclical Selection

• Directional Selection

Write the equation that helps in deriving the net primary productivity of an ecosystem.