Practice Start Test

Organisms and Populations

NEET Biology · 58 questions · Page 6 of 6 · Click an option or "Show Solution" to reveal answer

Q51
In a population unrestricted reproductive capacity is called as
A biotic potential
B fertility
C carrying capacity
D birth rate
Correct Answer
Option A
Solution

(a) Biotic potential = inherent maximum reproductive capacity of a population.

Q52
Which of the following is not true for a species?
A Members of a species can interbreed.
B Gene flow does not occur between the populations of a species.
C Each species is reproductively isolated from every other species.
D Variations occur among members of a species.
Correct Answer
Option B
Solution

(b) Gene flow does occur between populations of the same species.

Q53
People living at high altitude have more RBCs because
A atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive
B there is more UV radiation which enhances RBC production
C people eat more nutritive food, therefore more RBCs are formed
D people get pollution-free air to breathe and more oxygen is available
Correct Answer
Option A
Solution

(a) Low O2 at high altitude → more RBCs needed to carry sufficient oxygen.

Q54
The formula for exponential population growth is
A dN/rN=dt
B rN/dN=dt
C dN/dt=rN
D dt/dN=rN
Correct Answer
Option C
Solution

(c) Exponential growth: dN/dt = rN, where r = biotic potential.

Q55
A high density of elephant population in an area can result in
A intra specific competition
B inter specific competition
C predation on one another
D mutualism.
Correct Answer
Option A
Solution

(a) High density of same species → intraspecific competition for food, space, mates.

Q56
Homeostasis is
A tendency of biological systems to change with change in environment
B tendency of biological systems to resist change
C disturbance of self regulatory system and natural controls
D biotic materials used in homeopathic medicines.
Correct Answer
Option B
Solution

(b) Homeostasis: tendency of biological systems to maintain stable internal environment.

Q57
A fertile agricultural soil appears deep coloured at the surface. The reason is
A more moisture
B rich in organic matter
C rich in iron, calcium and magnesium
D recent formation
Correct Answer
Option B
Solution

(b) High organic matter (humus) darkens the colour of topsoil.

Q58
Soil best suited for plant growth is
A clay
B loam
C sandy
D gravel
Correct Answer
Option B
Solution

(b) Loam soil has best aeration, nutrients and water-holding capacity.

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