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NEET Organisms and Populations PYQs with Solutions

607 previous year questions from Organisms and Populations (NEET UG Zoology) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

607 questionsZoology2001–2026Answers + solutions

About Organisms and Populations PYQs

Organisms and Populations has 607 previous year questions in the Quantrex Academy NEET UG Zoology bank. The 220 questions in this list come from NEET (165), AIIMS (34) and JIPMER (21), spanning 2001 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

NEET Organisms and Populations PYQs with Solutions

About Organisms and Populations PYQs

Questions by year (this list)

Organisms and Populations questions with solutions

Match List-I with List-II . List-I List-II A. Both species are harmed I. Predation B. One species is harmed and the other is benefited II. Mutualism C. Both species are benefited

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

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

Consider a population of 10 million cells. Given the per-capita birth rate of 0.002 (per unit time) and the per-capita death rate of 0.002 (per unit time), the expected number of

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

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

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

Who is known as the father of Ecology in India?

Given below are two statements : 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

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

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

When will the population density increase, under special conditions? When the number of :

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 Chose the correct

Match List-I with List-II List-I List-II A. Migratory flamingoes and resident fish in South American lakes I. Interference competition B. Abingdon tortoise became extinct after

The equation of Verhulst-Pearl logistic growth is dN dt =rN[ K-N K ] . From this equation, K indicates:

What do 'a' and 'b' represent in the following population growth curve?

Given below are two statements: Statement I: Gause's competitive exclusion principle states that two closely related species competing for different resources cannot exist

For chemical defence against herbivores, Calotropis has

Plants offer rewards to animals in the form of pollen and nectar and the animals facilitate the pollination process. This is an example of :

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : A person goes to high altitude and experiences "Altitude

If there are 250 snails in a pond, and within a year their number increases to 2500 by reproduction. What should be their birth rate per snail per year?

Match List I with List II: List I (Interaction) List II (Species A and B) A. Mutualism I. +(A), 0(B) B. Commensalism II. -(A), 0(B) C. Amensalism III. +(A), -(B) D. Parasitism IV.

Given below are two statements: Statement I: Gause&#39;s &#39;Competitive Exclusion Principle&#39; states that two closely related species competing for the same resources cannot

Match List I with List II: List I (Interacting species) List II (Name of Interaction) A. A Leopard and a Lion in a forest/grassland I. Competition B. A Cuckoo laying egg in a

Match List I with List II : List I List II A. Logistic growth I. Unlimited resource availability condition B. Exponential growth II. Limited resource availability condition C.

The species that come to appear in bare area are called :

Frugivorous birds are found in large numbers in tropical forests mainly because of :

Two butterfly species are competing for the same nectar of a flower in a garden. To survive and coexist together, they may avoid competition in the same garden by:

Which one of the following statements cannot be connected to Predation?

If &#39; 8 &#39; Drosophila in a laboratory population of &#39; 80 &#39; died during a week, the death rate in the population is ____ individuals per Drosophila per week.

While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (-) sign is assigned for detrimental interaction and (0) for neutral

Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

Assertion (A): A person goes to high altitude and experiences &#39;altitude sickness&#39; with symptoms like breathing difficulty and heart palpitations. Reason (R): Due to low

Amensalism can be represented as:

In the exponential growth equation N _ t = N _ 0 e ^ rt , e, represents:

Match List - I with List - II . List - I List - II (a) Allen&#39;s Rule (i) Kangaroo rat (b) Physiological adaptation (ii) Desert lizard (c) Behavioural adaptation (iii) Marine

A species which was introduced for ornamentation but has become a trouble-some weed in India:

Match the items in Column - I with those in Column - II : Column - I Column - II (a) Herbivores-Plants (i) Commensalism (b) Mycorrhiza-Plants (ii) Mutualism (c) Sheep-Cattle (iii)

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

The impact of immigration on population density is:

Select the correct option w.r.t. age pyramids.

Assertion : Fig and wasp cannot complete their life cycle without each other. Reason : They show mutualistic relationship.

Match the column I with column II.

An interaction in which one organism is benefitted and other is unaffected

A population of a species invades a new area. Which of the following conditions will lead to adaptive radiation?

Between which among the following, the relationship is not an example of commensalism?

Match Column - I with Column - II Column-I Column-II (a) Saprophyte (i) Symbiotic association of fungi with plant roots (b) Parasite (ii) Decomposition of dead organic materials

Carnivorous animals-lions and leopards, occupy the same niche but lions predate mostly larger animals and leopards take smaller ones. This mechanism of competition is referred to

Match the columns.

Assertion : Appetency is the formation of new structure or habit of the organism according to its need. Reason : Appetency is also called doctrine of desire.

At a particular locus, frequency of allele ' A ' is 0.6 and that of allele ' a ' is 0.4 . What would be the frequency of heterozygotes in a random mating population at equilibrium?

Assertion : Ectotherms are able to remain active under cold conditions. Reason : Ectotherms are able to maintain a constant internal temperature, even when the temperature outside

Assertion : Mullerian and Batesian mimicry both are protective mimicry. Reason : Viceroy butterfly shows Mullerian mimicry.

In a population of 1000 individuals, 360 belong to genotype AA, 480 to Aa and the remaining 160 to aa. Based on this data, the frequency of allele A in the population is

In a growing population of the country,

Which one of the following population interactions is widely used in medical science for the production of antibiotics?

Natality refers to

The process where a population inhibits the growth of other population without affecting itself is known as

Which of the following is not a factor that would limit the growth of a population?

Asymptote is a logistic growth curve is obtained when

Match column I with column II and select the correct option from the codes given below.

The primary producers of the deep-sea hydrothermal vent ecosystem are

If &#39; + &#39; sign is assigned to beneficial interaction, &#39; – &#39; sign to detrimental and &#39; 0 &#39; sign to neutral interaction, then the population interaction

Which of the following is correct for r-selected species?

The principle of competitive exclusion was stated by

Gause's principle of competitive exclusion states that:

When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN / dt = rN(1 - N / K):

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

The species confined to a particular region and not found elsewhere termed as:

Root does not help in the absorption of water in which of the following plant?

Most animals are tree dwellers in a:

The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that.

Which of the following associations shows mutualism?

Assertion : Interspecific competition is the only potent force in organic evolution. Reason: Unexceptionally two closely related species competing for the same resources cannot

Choose the wrong pair

Viscum album grown on trees. This is an example of

Given below are two statements: Statement I: Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot

If ' 8 ' Drosophila in a laboratory population of ' 80 ' died during a week, the death rate in the population is ____ individuals per Drosophila per week.

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

Match List - I with List - II . List - I List - II (a) Allen's Rule (i) Kangaroo rat (b) Physiological adaptation (ii) Desert lizard (c) Behavioural adaptation (iii) Marine

If ' + ' sign is assigned to beneficial interaction, ' – ' sign to detrimental and ' 0 ' sign to neutral interaction, then the population interaction