Organisms and Populations - NCERT Based MCQs for NEET

This article contains NCERT based 45 MCQ questions test on Biology chapter "Organisms and Populations". These questions are highly valuable for the NEET exam. You can attempt these questions in the form of an interactive quiz and calculate your score. Read the below quiz rules carefully before you start

General Instructions

• Quiz contains 45 questions of 4 marks each.
• Correct answer (✔) will award you +4 marks and Incorrect answer (✘) will give you -1 mark.
• Total test is of 180 marks.
• Tap on box in order to select any option that you think is correct.
• Press the Submit button given in the end of quiz to calculate your score.
• There is a PDF file attached in the end of quiz. You can see detailed solutions to all questions and do self analysis from that file as well. 

Question 1. Benthic organisms are affected the most by

(1) light reaching the forest floor

(2) surface turbulence of water

(3) sediment characteristics of aquatic ecosystems

(4) water-holding capacity of soil

1

2

3

4

Question 2. The term niche of a species refers to

(1) specific place where an organism lives

(2) competitive power of an organism

(3) specific function of an organism

(4) specific and habitual function

1

2

3

4

Question 3. Besides paddy fields, cyanobacteria are also found inside vegetative part of :

(1) Psilotum 

(2) Pinus

(3) Cycas 

(4) Equisetum

1

2

3

4

Question 4. A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is –

(1) Amensalism 

(2) Ectoparasitism

(3) Symboisis 

(4) Commensalism

1

2

3

4

Question 5. 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 population is –

(1) Zero 

(2) 10

(3) 15 

(4) 5

1

2

3

4

Question 6. Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to –

(1) Western Ghat 

(2) Meghalaya

(3) Corbett National Park 

(4) Keolado National Park

1

2

3

4

Question 7. The study of the relation of an organism with its environment is called

(1) synecology 

(2) bionomics

(3) autecology 

(4) herpetology

1

2

3

4

Question 8. Major ecological community of plants and animals

extending over large natural areas is known as

(1) bioregion 

(2) biosphere

(3) biota 

(4) biome

1

2

3

4

Question 9. The following graph depicts changes in two

populations (A and B) of herbivores in a grassy field. A

possible reason for these is that :

(1) Population B competed more successfully for food than population A.

(2) Population A produced more offspring than population B.

(3) Population A consumed the members of population B

(4) Both plant populations in this habitat decreased.

1

2

3

4

Question 10. In which of the following interactions both partners are

adversely affected ?

(1) Predation 

(2) Parasitism

(3) Mutualism 

(4) Competition

1

2

3

4

Question 11. An association of individuals of different species living in the same habitat and having functional interactions is:

(1) Biotic community 

(2) Ecosystem

(3) Population 

(4) Ecological niche

1

2

3

4

Question 12. 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)

(1) When N/K is exactly one

(2) When N nears the carrying capacity of the habitat

(3) When N/K equals zero

(4) When death rate is greater than birth rate

1

2

3

4

Question 13. The geographic limit within which a population exists is called

(1) niche (2) ecosystem

(3) habitat (4) biome

1

2

3

4

Question 14. In a fresh water environment like pond, rooted autotrophs are

(1) Nymphaea and Typha

(2) Ceratophyllum and Utricularia

(3) Wolffia and Pistia

(4) Azolla and Lemna

1

2

3

4

Question 15. Gause’s principle of competitive exclusion states that –

(1) More abundant species will exclude the less abundant species through competition.

(2) Competition for the same resources excludes species having different food preferences.

(3) No two species can occupy the same niche indefinitely for the same limiting resources.

(4) Larger organisms exclude smaller ones through competition.

1

2

3

4

Question 16. Which part of the world has a high density of organisms?

(1) Deciduous forests 

(2) Grasslands

(3) Tropical rain forests 

(4) Savannahs

1

2

3

4

Question 17. If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to

(1) Mutualism 

(2) Amensalism

(3) Commensalism 

(4) Parasitism

1

2

3

4

Question 18. The principle of competitive exclusion was stated by

(1) C. Darwin 

(2) G. F. Gause

(3) MacArthur 

(4) Verhulst and Pearl

1

2

3

4

Question 19. Autecology is the:

(1) Relation of a population to its environment

(2) Relation of an individual to its environment

(3) Relation of a community to its environment

(4) Relation of a biome to its environment

1

2

3

4

Question 20. Which of the following forest plants controls the light conditions at the ground?

(1) Lianas and climbers 

(2) Shrubs

(3) Tall trees 

(4) Herbs

1

2

3

4

Question 21. A population has more young individuals compared to the older individuals. What would be the status of the population after some years?

(1) It will decline

(2) It will stabilise

(3) It will increase

(4) It will first decline and then stabilise

1

2

3

4

Question 22. A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

(1) 128 (2) 24

(3) 64 (14) 32

1

2

3

4

Question 23. Many fresh water animals cannot live for long in sea water mainly because of the

(1) change in the atmosphere

(2) change in the levels of thermal tolerance

(3) variations in light intensity

(4) osmotic problems they would face

1

2

3

4

Question 24. Some desert beetles can survive on “metabolic water”, without ever drinking liquid water which

(1) is a breakdown product of pyruvate inside the mitochondria, along with carbon dioxide.

(2) was produced as water in the organisms they eat

(3) is a breakdown product from glycolysis in the cytoplasm.

(4) is absorbed from the air along with respiratory oxygen

1

2

3

4

Question 25. The adaptations in an organism are meant for

(1) optimum primary production

(2) optimum life span

(3) optimum mobility

(4) optimum survival and reproduction

1

2

3

4

Question 26. Allen’s rule applies to –

(1) tribes living in high altitudes

(2) mammals from colder climates

(3) fish living in Antarctic waters

(4) desert lizards

1

2

3

4

Question 27. Which one of the following is the specific xerophytic adaptation?

(1) Presence of spines

(2) Absence of stomata

(3) Presence of long tap root system

(4) Presence of stipular leaves

1

2

3

4

Question 28. Which of the following statements regarding responses of organisms to abiotic factors is false?

(1) All birds & mammals are capable of thermoregulation.

(2) Majority of animals and nearly all plants cannot maintain a constant internal environment.

(3) Shivering is a kind of exercise which produces heat and raises body temperature.

(4) Very small animals are commonly found in polar regions as they have to spend less energy to generate body heat.

1

2

3

4

Question 29. The success of mammals on earth is largely because

(1) they have the ability to maintain constant body temperature.

(2) they can conform to the changes in the environment.

(3) they can take care of their young ones as they have mammary glands to suckle them.

(4) they can reduce metabolic activity and go into a state of dormancy during unfavorable conditions in the environment.

1

2

3

4

Question 30. Which of the following is a partial root parasite?

(1) Sandal wood 

(2) Mistletoe

(3) Orobanche 

(4) Ganoderma

1

2

3

4

Question 31. Which one of the following is not a parasitic

adaptation?

(1) Development of adhesive organs

(2) Loss of digestive organs

(3) Loss of reproductive capacity

(4) Loss of unnecessary sense organs

1

2

3

4

Question 32. Organisms capable of maintaining constant body

temperature are

(1) stenothermal 

(2) homoiothermal

(3) poiki lothermal 

(4) conformers.

1

2

3

4

Question 33. The animals that rely on the heat from environment

than metabolism to raise their body temperature are, in

strict sense, called

(1) ectothemnic 

(2) poikilothermic

(3) homeothermic 

(4) endothermic

1

2

3

4

Question 34. The stage of suspended development shown by

zooplanktons is called

(1) desiccation 

(2) diapause

(3) hibernation 

(4) homeostasis

1

2

3

4

Question 35. Match the following and select the correct option.

Column I	Column II
A. Bears	1. Diapause
B. Snail	2. Hibernation
C. Zooplanktons	3. Dormacy
D. Seeds	4. Aestivation

(1) A-3, B-4, C-l, D-2 

(2) A-2, B-1, C-4, D-3

(3) A-4, B-1, C-2, D-3 

(4) A-2, B-4, C-l, D-3

1

2

3

4

Question 36. The feature of the xerophytic plant leaves are

(I) Leathery surface

(II) Large surface area

(III) Waxy cuticle

(IV) Sunken stomata on upper epidermis

(1) I, II and IV 

(2) II and III

(3) I, III and IV 

(4) I and IV

1

2

3

4

Question 37. Hydrophytes are characterized by

(1) leaf reduced to spines

(2) well developed vascular tissue

(3) well developed mechanical tissue

(4) increase in aerenchyma

1

2

3

4

Question 38. The correct statement is –

(1) in a population, number of births is different from birth rate.

(2) a sigmoid growth curve is depiction of exponential growth.

(3) in a logistic growth curve the asymptote is beyond the carrying capacity.

(4) ‘r’ is equal to the difference between number of births and number of deaths in a population

1

2

3

4

Question 39. A decline in population size will be in the simulation

(1) Natality < Mortality

(2) Mortality < Natality

(3) Immigration < Emigration

(4) Both (1) and (3)

1

2

3

4

Question 40. Connel’s field experiment on the rocky sea coast of Scotland, where larger Barnacle balanus dominates the intertidal area and removes the smaller Barnacle cathamalus. This happened due to –

(1) parasitism 

(2) predation

(3) mutualism 

(4) competition

1

2

3

4

Question 41. All the following interactions are mutualism, except

(1) Plant and animal relation for pollination.

(2) Association of algae and fungi in lichens.

(3) Association of cattle egret and grazing cattle.

(4) Association of fungi and roots of higher plants in mycorrhiza

1

2

3

4

Question 42. In which type of interactions, both the interacting organisms do not live close together?

(1) Mutualism 

(2) Predation

(3) Competition 

(4) Parasitism

1

2

3

4

Question 43. Which of the following organisms cite an example of commensalism?

(1) Sea anemone and clown fish

(2) Sea anemone and hermit crab

(3) Lichens

(4) None of these

1

2

3

4

Question 44. Which of the following associations shows mutualism?

(1) Fig and wasp

(2) Barnacles on whale

(3) Roundworms in human intestine

(4) Orchids on mango tree

1

2

3

4

Question 45. An orchid growing as an epiphyte on a mango tree is an example for

(1) parasitism 

(2) predation

(3) commensalism 

(4) mutualism

1

2

3

4

Detailed Solutions

Return Back to - NEET Chapterwise Test Series