What type of human population is represented by the following age pyramid?

(a)

Vanishing population

(b)

Stable population

(c)

Declining population

(d)

Expanding population

The word 'niche' was first used by __________

(a)

Charles Elton

(b)

Van't Hoff

(c)

Bergmann

(d)

Jordon

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

(a)

Light

(b)

Temperature

(c)

Water

(d)

Soil

"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

Which of the following is a behavioural adaptation?

(a)

Thick fur

(b)

camouflage

(c)

Sharp canines

(d)

Migration

Identify the response under which 'Osmotic balance' can be classified.

(a)

Suspend

(b)

Regulate

(c)

Migrate

(d)

Conform

Type of response in hibernation and aestivation.

(a)

Suspend

(b)

Regulate

(c)

Migrate

(d)

Conform

Animals destroyed at the feet of elephants is an example of ____________

(a)

Mutualism

(b)

Amensalism

(c)

Commensalism

(d)

parasitism

Birds sitting on cows to eat insects is an example of ____________

(a)

Competition

(b)

Mutualism

(c)

Commensalism

(d)

Amensalism

Nuts are eaten by birds and squirrels. This is an example of an interaction called _____________

(a)

Commensalism

(b)

Mutualism

(c)

Amensalism

(d)

Competition

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

(a)

Relative abundance

(b)

Ecological density

(c)

Crude density

(d)

Population density

Diapause is a type of response classified under_______.

(a)

Suspend

(b)

Migrate

(c)

Conform

(d)

Regulate

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.

Study the four statements (A to D) given below and select the two correct ones out of them.
A) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers.
B) Predator starfish Pisaster helps in maintaining species diversity of some invertebrates.
C) Predators ultimately lead to the extinction of prey species.
D) Production of chemicals such as nicotine, strychnine by the plants is disordered.
The two correct statements are

(a)

(B) and (C)

(b)

(C) and (D)

(c)

(A) and (D)

(d)

(A) and (B)

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)