Subject Experts Solutions for Exercise 4: Assertion & Reason

Assertion : No two species can occupy the same ecological niche in a habitat

Reason : A habitat can contain only one ecological

Assertion: The crown fires are most destructive.

Reason: Due to crown fire the temperature of that area may rise upto $700°\mathrm{C}$ .

Assertion : Removal of keystone species doesn't cause any serious disruption in the functioning of the community.

Reason : Keystone species are low in abundance (or biomass) than the dominant species.

Assertion : Relationship between sea anemone and hermit crab is said to be an example of obligate mutualism.

Reason : Obligate mutualism is a positive (beneficial) interaction between two species.

Assertion $\left(\mathrm{A}\right)$: Ecological equivalents possess similar types of adaptations.
Reason $\left(\mathrm{R}\right)$: Ecological niche is the total interaction of a species with environment.

Assertion : Inhibition of death of one organism by another through the production of some by- products is known as antibiosis.
Reason : Antibiosis is a type of negative interaction.

Assertion : Aerenchyma is present in the leaves and petioles of hydrophytes.

Reason : Aerenchyma imparts buoyancy to the hydrophytes.

With respect to Eichhorrnia:

Assertion: It drains off Oxygen from water and is seen growing in standing water 
Reason: It is an indigenous species of our country.