Organisms and Populations Questions — NEET Biology

Q1

Which of the following is not an attribute of a population?

A Natality

B Mortality

C Species interaction

D Sex ratio

Correct Answer

Option C

Solution

(c) Species interaction is a community attribute, not a population attribute.

Q2

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

A Growth response

B Defence action

C Effect on reproduction

D Nutritive value

Correct Answer

Option B

Solution

(b) Plants produce alkaloids like nicotine, caffeine, quinine as defences against herbivores.

Q3

Consider the following four conditions and select the correct pair as adaptation in desert lizards.

A (iii), (iv)

B (i) and (iii)

C (ii), (iv)

D (i), (ii)

Correct Answer

Option B

Solution

(b) Desert lizards burrow to escape heat (i) and bask in sun to warm up (iii).

Q4

Which one of the following pairs is mismatched?

A Tundra - Permafrost

B Savanna - Acacia trees

C Prairie - Epiphytes

D Coniferous forest - Evergreen trees

Correct Answer

Option C

Solution

(c) Prairie is grassland; epiphytes are found in tropical rainforests, not prairies.

Q5

The logistic population growth is expressed by the equation:

A dt/dN=Nr(K-N/K)

B dN/dt=rN(K-N/K)

C dN/dt=rN

D dN/dt=rN(N-K/N)

Correct Answer

Option B

Solution

(b) Logistic growth: dN/dt = rN[(K-N)/K], where K is carrying capacity.

Q6

Xeric environment is characterised by

A precipitation

B low atmospheric humidity

C extremes of temperature

D high rate of vapourisation

Correct Answer

Option B

Solution

(b) Xeric environments are characterised by low atmospheric humidity.

Q7

Desert plants are generally

A viviparous

B succulent

C herbaceous

D heterophyllus

Correct Answer

Option B

Solution

(b) Desert plants are succulent (store water) for survival in arid conditions.

Q8

Animals that can tolerate a narrow range of salinity are

A stenohaline

B euryhaline

C anadromous

D catadromous

Correct Answer

Option A

Solution

(a) Stenohaline animals tolerate only narrow salinity range.

Q9

Which one of the following is one of the characteristics of a biological community?

A Stratification

B Natality

C Mortality

D Sex ratio

Correct Answer

Option A

Solution

(a) Stratification (vertical layering) is a characteristic of a biological community.

Q10

In which of the following interactions both partners are adversely affected ?

A Predation

B Parasitism

C Mutualism

D Competition

Correct Answer

Option D

Solution

(d) Competition adversely affects all competing partners.