Organisms which can survive a wide range of temperatuer are called

(a)

Ectotherms

(b)

Eurytherms

(c)

Endotherms

(d)

Stenotherms

The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do A, B and C represent respectively.

(a)

A	B	C
Conformer	Regulator	Partial Regulator

(b)

A	B	C
Regulator	Partial Regulator	Conformer

(c)

A	B	C
Partial Regulator	Regulator	Conformer

(d)

A	B	C
Regulator	Conformer	Partial Regulator

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

(a)

Vanishing population

(b)

Stable population

(c)

Declining population

(d)

Expanding population

Which of the following is a behavioural adaptation?

(a)

Thick fur

(b)

camouflage

(c)

Sharp canines

(d)

Migration

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

(a)

Competition

(b)

Mutualism

(c)

Commensalism

(d)

Amensalism

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)

People who have migrated from the planes to an area adjoining Rohtang Pass about six months back

(a)

Have more RBC's and their haemoglobin has a lower binding affinity to O₂

(b)

Are not physically fit to play games like football

(c)

Suffer from altitude sickness with symptoms like nausea, fatigue, etc.

(d)

Have the usual RBC count but then haemoglobin has very high binding affinity to O₂.

Functional status of an organism in its community is _______________

(a)

Biome

(b)

Niche

(c)

Species

(d)

Population

Assertion (A): Movement of organism from one place to another and back is called migration.
Reason (R): Eel is an example for anadromous migration.

(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

As altitude increases _____________

(a)

O₂ density increases

(b)

Precipitation decreases

(c)

Temperature increases

(d)

Snowing decreases