Organisms and Populations

Q1 FREE PREVIEW

PYQ

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

aVanishing population

bStable population

cDeclining population

dExpanding population

✓ Correct answer: c) Declining population

ExplanationA declining population is one where the birth rate is lower than the death rate, causing the population size to decrease over time.Its age pyramid has a narrower base compared to the middle or older age groups, showing fewer young individuals.

Q2 FREE PREVIEW

PYQ

A biologist studied the population of rats in a barn. He found that the average natality was average mortality , immigration and emigration . The net increase in population is

a05

bZero

c10

d15

✓ Correct answer: b) Zero

ExplanationGiven: Natality (Births, B) = 250 Mortality (Deaths, D) = 240 Immigration (I) = 20 Emigration (E) = 30 Formula: Substitution: Correct Answer: Option B — Zero

Q3 FREE PREVIEW

PYQ

Study of inter-relationships between organisms and their environment is:

aEcology

bEcosystem

cPhytogeography

dEthology

✓ Correct answer: a) Ecology

ExplanationEcology is basically concerned with four levels of biological organisation – organisms, populations, communities and biomes

Q4

PYQ

In the exponential growth equation , e represents [NEET 2021]

aThe base of geometric logarithms

bThe base of number logarithms

cThe base of exponential logarithms

dThe base of natural logarithms

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Q5

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Inspite of interspecific competition in nature, by which mechanism the competing species might have evolved for their survival? [NEET 2021]

aPredation

bResource partitioning

cCompetitive release

dMutualism

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Q6

PYQ

What do ' ' and ' ' represent in the following population growth curve? [Re-NEET 2024]

a'a' represents exponential growth when responses are not limiting the growth; and ' b ' represents logistic growth when responses are limiting the growth.

b'a' represents logistic growth when responses are not limiting the growth; ' b ' represents exponential growth when responses are limiting the growth.

c'a' represents carrying capacity and ' b ' shows logistic growth when responses are limiting the growth.

d'a' represents exponential growth when responses are not limiting the growth and ' b ' shows carrying capacity.

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Q7

PYQ

Which one of the following is an appropriate example of 'sexual deceit' ?

[NEET 2026]

a

Female wasp and fig

b

Cuckoo and crow

c

Ophrys and bumblebee

d

Sea anemone and clown fish

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Q8

PYQ

The equation of Verhulst-Pearl logistic growth is \(\frac{dN}{dt}=rN\left[\frac{K-N}{K}\right]\text{. }\)From this equation, K indicates:

[NEET 2024]

a

Population density

b

Intrinsic rate of natural increase

c

Biotic potential

d

Carrying capacity

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Q9

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Choose the correct statements regarding population interactions between two species.
A. In both parasitism and commensalism, only one species benefits and the other species is harmed.
B. Both species benefit in mutualism.
C. Both species benefit in commensalism,
D. In parasitism, only one species benefits and the other species is harmed.
E. In amensalism, one species is harmed and the other is unaffected.
Choose the correct answer from the options given below:

[NEET 2026]

a

A and D only

b

A and B only

c

B and E only

d

B, D and E Only

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Q10

PYQ

Which of the following equations depicts Verhulst-Pearl logistic population growth?

[NEET 2026]

a

\(\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left(\frac{\mathrm{K}-\mathrm{N}}{\mathrm{K}}\right)\)

b

\(\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left(\frac{\mathrm{K}+\mathrm{N}}{\mathrm{K}}\right)\)

c

\(\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left(\frac{\mathrm{K}}{\mathrm{K}-\mathrm{N}}\right)\)

d

\(\frac{\mathrm{dN}}{\mathrm{d}\overset{}{\mathrm{t}}}=\mathrm{rN}\left(\frac{\mathrm{K}-\mathrm{N}}{\mathrm{N}}\right)\)

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Q11

PYQ

Epiphytes that are growing on a mango branch is an example of which of the following?

[NEET 2025]

a

Predation

b

Amensalism

c

Commensalism

d

Mutualism

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Q12

PYQ

When will the population density increase, under special conditions?

[Re-NEET 2024]

a

Deaths exceeds number of births and also number of emigrants equals number of immigrants.

b

Births plus number of immigrants equals number of deaths plus number of emigrants.

c

Births plus number of emigrants is more than the number of deaths plus number of immigrants.

d

Births plus number of immigrants is more than the sum of number of deaths and number of emigrants.

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Q13

PYQ

The equation of Verhulst-Pearl logistic growth is \(\frac{dN}{dt}=rN\left[\frac{K-N}{K}\right]\text{. }\)From this equation, K indicates:

[NEET 2024]

a

Population density

b

Intrinsic rate of natural increase

c

Biotic potential

d

Carrying capacity

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Q14

PYQ

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced.

Reason R: Goats were more efficient at browsing than Abingdon tortoise.

In the light of the above statements, choose the most appropriate answer from the options given below:

[Re-NEET 2026]

a

Both A and R are correct and R is the correct explanation of A

b

Both A and R are correct but R is not the correct explanation of A

c

A is correct but R is not correct

d

A is not correct but R is correct

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Q15

PYQ

When will the population density increase, under special conditions?

[Re-NEET 2024]

a

Deaths exceeds number of births and also number of emigrants equals number of immigrants.

b

Births plus number of immigrants equals number of deaths plus number of emigrants.

c

Births plus number of emigrants is more than the number of deaths plus number of immigrants.

d

Births plus number of immigrants is more than the sum of number of deaths and number of emigrants.

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Q16

PYQ

Match List-I with List-II :

List I	List II
A. Predator	I. Ophrys
B. Mutualism	II. Pisaster
C. Parasitism	III. Female wasp and fig
D. Sexual deceit	IV. Plasmodium

Choose the correct answer from the options give below :

[Re-NEET 2024]

a

A-III, B-II, C-I, D-IV

b

A-IV, B-I, C-II, D-III .

c

A-II, B-III, C-I, D-IV

d

A-II, B-III, C-IV, D-I

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Q17

PYQ

Which one of the following equations represents the Verhulst-Pearl Logistic Growth of population?

a

\(\frac{dN}{dt}=rN\left(\frac{N-K}{N}\right)\)

b

\(\frac{dN}{dt}=N\left(\frac{r-K}{K}\right)\)

c

\(\frac{dN}{dt}=r(\frac{K-N}{K})\)

d

\(\frac{dN}{dt}=rN(\frac{K-N}{K})\)

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Q18

PYQ

Given below are two statements
Statement I : Gause's competitive exclusion principle states that two closely related species competing for different resources cannot exist indefinitely.
Statement II : According to Gause's principle, during competition, the inferior will be eliminated. This may be true if resources are limiting.
In the light of the above statements, choose the correct answer from the options given below :

[NEET 2024]

a

Statement I is false but Statement II is true.

b

Both Statement I and Statement II are true.

c

Both Statement I and Statement II are false.

d

Statement I is true but Statement II is false.

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Q19

PYQ

Statement-I: Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it.
Statement-II: Fig wasp and fig tree exhibit mutual relationship as fig wasp completes its life cycle in fig fruit and fig fruit gets pollinated by fig wasp.
In the light of the above statements, choose the correct answer from the options given below:

[NEET 2025]

a

Statement-I is correct but Statement-II is incorrect

b

Statement-I is incorrect but Statement-II is correct

c

Both Statement-I and Statement-II are correct.

d

Both Statement-I and Statement-II are incorrect

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Q20

PYQ

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: The logistic growth model of populations is considered more realistic than the exponential growth model.

Reason R: Resources are finite.

In the light of the above statements, choose the most appropriate answer from the options given below:

[Re-NEET 2026]

a

Both A and R are correct and R is the correct explanation of A

b

Both A and R are correct but R is not the correct explanation of A

c

A is correct but R is not correct

d

A is not correct but R is correct

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Q21

PYQ

The impact of immigration on population density is

[Re-NEET 2020]

a

Both positive and negative

b

Neutralized by natality

c

Positive

d

Negative

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Q22

PYQ

Given below are two statements :
Statement I : Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually.
Statement II : In general, carnivores are more adversely affected by competition than herbivores.

In the light of the above statements, choose the correct answer from the options given below:

[NEET 2023]

a

Both Statement I and Statement II are false.

b

Statement I is correct but Statement II is false.

c

Statement I is incorrect but Statement II is true.

d

Both Statement I and Statement II are true.

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Q23

PYQ

Amensalism can be represented as:

[NEET 2021]

a

Species A (+); Species B (0)

b

Species A (-); Species B (0)

c

Species A (+); Species B (+)

d

Species A (-); Species B (-)

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Q24

PYQ

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

[NEET 2020]

a

Natality

b

Mortality

c

Species interaction

d

Sex ratio

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Q25

PYQ

Read the following statements

Assertion (A): A person goes to high altitude and experiences altitude sickness with symptoms like breathing difficulty and heart palpitations.

Reason (R): Due to low atmospheric pressure at high altitudes, the body does not get sufficient oxygen.

In the light of the above statements, choose the correct answer from the options given below

[NEET 2021]

a

(A) is false but (R) is true

b

Both (A) and (R) are true and (R) is the correct explanation of (A)

c

Both (A) and (R) are true but (R) is not the correct explanation of (A)

d

(A) is true but (R) is false

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Q26

PYQ

In the exponential growth equation \( \mathrm{N}_{\mathrm{t}}=\mathrm{N}_{\mathrm{o}} \mathrm{e}^{\mathrm{rt}} \), e represents

[NEET 2021]

a

The base of geometric logarithms

b

The base of number logarithms

c

The base of exponential logarithms

d

The base of natural logarithms

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