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.
(i) Curve a represents exponential growth which shows that there is ample food and space for the population. Resources are unlimited.
Curve b represents logistic growth and shows that there is limiting food and space for the population. The resources are limiting.
(ii) In the absence of predators, curve (a) would appropriately depict the prey population.
(iii) The dotted line represents the carrying capacity of the environment. The carrying capacity represents the size of population that the environment can hold by providing necessary resources. When a population reaches this line its population size is stabilized by various environmental factors.
Construct an age pyramid which reflects a stable growth status of human population.
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
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
Write the equation that helps in deriving the net primary productivity of an ecosystem.
