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Organisms and Populations — NEET UG Zoology PYQs

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

607 questionsZoologySolutions on every page
1

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 I

NEET 2026 Solution View → 2

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 harm

NEET 2026 Solution View → 3

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

NEET 2026 Solution View → 4

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 c

NEET 2026 Solution View → 5

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 re

NEET 2026 Solution View → 6

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

NEET 2026 Solution View → 7

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

NEET 2026 Solution View → 8

Who is known as the father of Ecology in India?

NEET 2025 Solution View → 9

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 relations

NEET 2025 Solution View → 10

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

NEET 2025 Solution View → 11

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

NEET 2025 Solution View → 12

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

NEET 2024 Solution View → 13

Match List-I with List-II: array |l|l|l|l| & List I & & List II A. & Predator & I. & Ophrys B. & Mutualism & II. & Pisaster C. & Parasitism & III. & Female wasp and fig D & Sexual

NEET 2024 Solution View → 14

Match List-I with List-II array |l|l|r|l| & List-I & & List-II A. & Migratory flamingoes and resident fish in South American lakes & I. & Interference competition B. & array l Abin

NEET 2024 Solution View → 15

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

NEET 2024 Solution View → 16

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

NEET 2024 Solution View → 17

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

NEET 2024 Solution View → 18

For chemical defence against herbivores, Calotropis has

NEET 2023 Solution View → 19

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

NEET 2023 Solution View → 20

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 S

NEET 2023 Solution View → 21

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?

NEET 2023 Solution View → 22

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.

NEET 2023 Solution View → 23

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

NEET 2023 Solution View → 24

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 Crow&

NEET 2023 Solution View → 25

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. Expa

NEET 2023 Solution View → 26

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

NEET 2022 Solution View → 27

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

NEET 2022 Solution View → 28

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:

NEET 2022 Solution View → 29

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

NEET 2022 Solution View → 30

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.

NEET 2022 Solution View → 31

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

NEET 2022 Solution View → 32

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

NEET 2021 Solution View → 33

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 atm

NEET 2021 Solution View → 34

Amensalism can be represented as:

NEET 2021 Solution View → 35

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

NEET 2021 Solution View → 36

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 fis

NEET 2021 Solution View → 37

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

NEET 2020 Solution View → 38

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)

NEET 2020 Solution View → 39

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

NEET 2020 Solution View → 40

The impact of immigration on population density is:

NEET 2020 Solution View → 41

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

AIIMS 2019 Solution View → 42

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

AIIMS 2019 Solution View → 43

Match the column I with column II.

AIIMS 2019 Solution View → 44

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

JIPMER 2019 Solution View → 45

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

NEET 2019 Solution View → 46

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

NEET 2019 Solution View → 47

Match Column - I with Column - II Column-I Column-II a   Saprophyte   i Symbiotic association of fungi with plant roots b Parasite i i   Decomposition of dead organi

NEET 2019 Solution View → 48

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 a

NEET 2019 Solution View → 49

Match the columns.

AIIMS 2018 Solution View → 50

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.

AIIMS 2018 Solution View → 51

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?

AIIMS 2018 Solution View → 52

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

AIIMS 2018 Solution View → 53

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

AIIMS 2018 Solution View → 54

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

AIIMS 2018 Solution View → 55

In a growing population of the country,

NEET 2018 Solution View → 56

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

NEET 2018 Solution View → 57

Natality refers to

NEET 2018 Solution View → 58

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

AIIMS 2017 Solution View → 59

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

AIIMS 2017 Solution View → 60

Asymptote is a logistic growth curve is obtained when

NEET 2017 Solution View → 61

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

AIIMS 2016 Solution View → 62

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

NEET 2016 Solution View → 63

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

NEET 2016 Solution View → 64

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

NEET 2016 Solution View → 65

The principle of competitive exclusion was stated by

NEET 2016 Solution View → 66

Gause's principle of competitive exclusion states that:

NEET 2016 Solution View → 67

When does the growth rate of a population following the logistic model equal zero? The logistic model is given as d N / d t = r N 1 - N / K :

NEET 2016 Solution View → 68

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

NEET 2015 Solution View → 69

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

NEET 2015 Solution View → 70

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

NEET 2015 Solution View → 71

Most animals are tree dwellers in a:

NEET 2015 Solution View → 72

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.

NEET 2015 Solution View → 73

Which of the following associations shows mutualism?

AIIMS 2014 Solution View → 74

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

AIIMS 2014 Solution View → 75

Choose the wrong pair

JIPMER 2014 Solution View → 76

Viscum album grown on trees. This is an example of

JIPMER 2014 Solution View → 77

Biotic potential or potential natality means

JIPMER 2014 Solution View → 78

Match the following and select the correct option: (a) Earthworm (p) Pioneer species (b) Succession (q) Detrivore (c) Ecosystem service (r) Natality (d) Population growth (s) Polli

NEET 2014 Solution View → 79

Predation and parasitism are which type of interactions.

JIPMER 2013 Solution View → 80

Which of the following plant keeps its stomata open during night and closed during the day?

JIPMER 2013 Solution View → 81

A biologist studied the population of rats in a barn. He found that the average natality was 250 , average mortality 240, immigration 20 and emigration 30. The net increase in popu

NEET 2013 Solution View → 82

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is

NEET 2013 Solution View → 83

Which is correctly labelled with respect to the given diagram?

AIIMS 2012 Solution View → 84

Assertion : Some marine animals find it difficult to live in fresh water and vice versa. Reason : Some animals can tolerate a narrow salinity range, while others can tolerate a wid

AIIMS 2012 Solution View → 85

Which of the following is a total root parasite?

JIPMER 2012 Solution View → 86

Green potatoes are toxic due to

JIPMER 2012 Solution View → 87

Monarch butterfly escapes from predators by

AIIMS 2011 Solution View → 88

Consider the following four conditions (I-IV) and select the correct pair of them as adaptation to environment in desert lizards. The conditions : I. Burrowing in soil to escape hi

NEET 2011 Solution View → 89

The logistic population growth is expressed by the equation

NEET 2011 Solution View → 90

Large woody vines are more commonly found in

NEET 2011 Solution View → 91

Consider the following statements (I)-(IV) each with one or two blanks. I. Bears go into (1) during winter to ......(2) ...... cold weather. II. A conical age pyramid with a broad

NEET 2011 Solution View → 92

Assertion : All pathogens are parasites but all parasites are not pathogens. Reason : Majority of the parasites confer benefits to the host.

AIIMS 2010 Solution View → 93

The permanent decrease in population number occurs due to

JIPMER 2010 Solution View → 94

Benthic organisms are found in

JIPMER 2010 Solution View → 95

Study the four statements (1-4) given below and select the two correct ones out of them. (1) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being c

NEET 2010 Solution View → 96

Which one of the following is most appropriately defined?

NEET 2010 Solution View → 97

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

NEET 2010 Solution View → 98

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

NEET 2010 Solution View → 99

Animals having a built in thermostat to maintain constant body temperature are known as

JIPMER 2009 Solution View → 100

Animals undergoes inactive stage during winter, is known as

JIPMER 2009 Solution View → 101

Small fish get stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called as

JIPMER 2009 Solution View → 102

A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations A and B twenty years apart. Select the correct in

NEET 2009 Solution View → 103

Two opposite forces operate in the growth and development of every population. One of them is related to the ability to reproduce at a given rate. The force opposite to it is calle

AIIMS 2008 Solution View → 104

What is a keystone species?

AIIMS 2008 Solution View → 105

One of the major difficulties in the biological control of insect pest is that

AIIMS 2008 Solution View → 106

The growth curve of bacterial population in lab is plotted against time. What will be the shape of graph?

AIIMS 2008 Solution View → 107

Assertion : Koel does not build nest for egg laying. Reason : Koel lays its eggs in the nest of tailor bird.

AIIMS 2008 Solution View → 108

Which of the following statements is incorrect?

AIIMS 2008 Solution View → 109

Crossing over occurs in

JIPMER 2008 Solution View → 110

Study of Ecology of population is called

JIPMER 2008 Solution View → 111

Consider the following four statements (A-D) about certain desert animals such as kangaroo rat A. they have dark colour and high rate of reproduction and excrete solid urine. B. th

NEET 2008 Solution View → 112

What is true about the isolated small tribal populations?

NEET 2008 Solution View → 113

What is true about the isolated small tribal populations?

NEET 2008 Solution View → 114

The table below gives the populations (in thousands) of ten species (A-J) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the tab

NEET 2008 Solution View → 115

Quercus species are the dominant component in

NEET 2008 Solution View → 116

Consider the following four statements ( a - d ) about certain desert animals such as kangaroo rat. (a) They have dark colour and high rate of reproduction and excrete solid urine

NEET 2008 Solution View → 117

The table below gives the populations (in thousands) of ten species ( A - J ) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the

NEET 2008 Solution View → 118

About 70 % of total global carbon is found in

NEET 2008 Solution View → 119

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example

JIPMER 2007 Solution View → 120

Geometric representation of age structure is a characteristic of:

NEET 2007 Solution View →
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