Van't Hoffs rule describes the impact of ____________ on the environment.

(a)

Light

(b)

Temperature

(c)

Water

(d)

Soil

1000 fish in the volume of water in the pond indicates _____________________

(a)

Relative abundance

(b)

Ecological density

(c)

Crude density

(d)

Population density

Which one of the following is most appropriately defined?

(a)

Host is an organism which provides food to another organism.

(b)

Amensalism is a relationship in which one species is benefited whereas the other is unaffected.

(c)

Predator is an organism that catches and kills other organisms for food.

(d)

Parasite is an organism which always lives inside the body of other organism and may kill it.

Which two of the following changes (A to D) usually tend to occur in the plain dwellers when they move to high altitudes (3500 m or more)?
A) Increase in red blood cell size
B) Increase in red blood cell production
C) Increased breathing rate
D) Increase in thrombocyte count

(a)

(B) and (C)

(b)

(C) and (D)

(c)

(A) and (D)

(d)

(A) and (B)

Assertion (A): Snake is a stenotherm.
Reason (R): Organism can tolerate narrow temperature fluctuations

(a)

Both A and R are correct R explain A

(b)

A is correct R is incorrect

(c)

R does not explain A

(d)

Both A and R are incorrect