All populations in a given physical area are defined as

(a)

Biome

(b)

Ecosystem

(c)

Territory

(d)

Biotic factors

Match the following and choose the correct combination from the options given below.

Column I	Column II
A. Mutalism	1. Lion and deer
B. Commensalism	2. Round worm and man
C. Parasitism	3. Birds compete with squirrels for nuts
D. Competition	4. Sea anemone on hermit crab
E. Predation	5. Barnacles attached to Whales.

(a)

A- 4, B-5, C-2, D –3, E-1

(b)

A- 3, B-1, C-4, D – 2, E-5

(c)

A- 2, B-3, C-1, D – 5, E-4

(d)

A- 5, B-4, C-2, D – 3, E-1

The relationship between sucker fish and shark is__________

(a)

Competition

(b)

Commensalism

(c)

Predation

(d)

Parasitism.

Some organisms are able to maintain homeostasis by physical means _______

(a)

Conform

(b)

Regulate

(c)

Migrate

(d)

Suspend.

The word 'niche' was first used by __________

(a)

Charles Elton

(b)

Van't Hoff

(c)

Bergmann

(d)

Jordon

"Birds and mammals attain greater body size in colder regions than warmer regions." - Choose the correct option.

(a)

Bergmann's rule

(b)

Jordon's rule

(c)

Sewall wright effect

(d)

Allen's rule

Diapause is a type of response classified under_______.

(a)

Suspend

(b)

Migrate

(c)

Conform

(d)

Regulate

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)

Gause's principle of competitive exclusion states that:

(a)

More abundant species will exclude the less abundant species through competition

(b)

Competition for the same resources excludes species having different food preferences

(c)

No two species can occupy the same niche indefinitely for the same limiting resources

(d)

Larger organisms exclude smaller ones through competition

Maximum reproductive capacity of an organism under favorable condition is referred to as_______________

(a)

Carrying capacity

(b)

Biotic potential

(c)

Natality

(d)

Fecundity