Important Questions on Organism And Population Class 12

Organism And Population Class 12 NEET PYQ

The students who are targeting for NEET exam should prepare for all the important chapters of NEET syllabus to secure good marks in NEET 2022. Candidates planning to appear in the medical exam must have knowledge about the weightage of chapters. Biology section carries the maximum weightage.

Organism And Population is the ninth chapter categorized under the unit 'Ecology'. According to the NEET chapter wise weightage Organism And Population contributes to around 3% of the total number of questions asked in the last years. On average we can expect 3-4 questions from this particular chapter.

Here you will find all previous year Organism And Population Class 12 NEET Questions. Solving previous years Organism And Population Class 12 NEET Questions will be beneficial for you. Firstly you get an idea of what type of questions are asked in previous year.

Every year around many of questions of biology are repeated as it is without even changing single word. These previous year Organism And Population Class 12 NEET Questions will definitely guide you in what direction you need extra push.

Organism And Population Class 12 NEET Questions And Answers

1. Asymptote in a logistic growth curve is obtained when: (NEET 2017)

(a) K = N

(b) K > N

(d) the value of ‘r’ approaches zero

Solution : A

2. Plants which produce characteristic pneumatophores and show vivipary belong to'

(NEET 2017)

(a) halophytes

(b) psammophytes

(d) mesophytes.

Solution : A

3. Presence of plants arranged into well defined vertical layers depending on their height can be seen best in: (NEET 2017)

(a) tropical rainforest

(b) grassland

(d) tropical savannah

Solution : A

4. Mycorrhizae are the example of : (NEET 2017)

(a) amensalism

(b) antibiosis

(d) fungistasis

Solution : C

5. Which of the following is correct for r-selected species? (NEET II 2016)

(a) Large number of progeny with small size

(b) Large number of progeny with large size

(d) Small number of progeny with large size

Solution : A

6. If ‘+’ sign is assigned to beneficial interaction, ‘–’ sign to detrimental and ‘O’ sign to neutral interaction, then the population interaction represented by ‘+’ ‘–’ refers to : (NEET II 2016)

(a) mutualism

(b) amensalism

(d) parasitism

Solution : D

7. The principle of competitive exclusion was stated by: (NEET II 2016)

(a) C. Darwin

(b) G.F. Gause

(d) Verhulst and Pearl

Solution : B

8. It is much easier for a small animal to run uphill than for a large animal, because: (NEET I 2016)

(a) small animals have a lower O 2 requirement

(b) the efficiency of muscles in large animals is less than in the small animals

(d) smaller animals have a higher metabolic rate

Solution : B

9. 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) : (NEET I 2016)

(a) when N/K equals zero

(b) when death rate is greater than birth rate

(d) when N nears the carrying capacity of the habitat

Solution : C

10. Gause’s principle of competitive exclusion states that : (NEET I 2016)

(a) no two species can occupy the same niche indefinitely for the same limiting resources

(b) larger organisms exclude smaller ones through competition

(d) competition for the same resources exclude species having different food preferences

Solution : A

11. In which of the following interactions both partners are adversely affected? (2015)

(a) Parasitism

(b) Mutualism

(d) Predation

Solution : C

12. An association of individuals of different species living in the same habitat and having functional interactions is : (2015)

(a) ecosystem

(b) population

(d) biotic community

Solution : D

13. 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: (2015 Cancelled)

(a) population A produced more offspring than population B

(b) population A consumed the members of population B

(d) population B competed more successfully for food than population A

Solution : D

14. 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 : (2014)

(a) Western Ghat

(b) Meghalaya

(d) Keolado National Park

Solution : D

15. Besides paddy fields, cyanobacteria are also found inside vegetative part: (NEET 2013)

(a) Equisetum

(b) Psilotum

(d) Cycas

Solution : D

16. A sedentary sea anemone gets attached to the Lining shell lining of hermit crab. The association is : (NEET 2013)

(a) commensalism

(b) amensalism

(d) symbiosis

Solution : D

17. 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: (NEET 2013)

(a) 05

(b) zero

(d) 15

Solution : B

18. The age pyramid with broad base indicates : (Karnataka NEET 2013)

(a) high percentage of old individuals

(b) low percentage of young individuals

(d) high percentage of young individuals

Solution : D

19. Which one of the following is not a parasitic adaptation? (Karnataka NEET 2013)

(a) Development of adhesive organs

(b) Loss of digestive organs

(d) Loss of unnecessary sense organs

Solution : C

20. Benthic organisms are affected the most by : (Karnataka NEET 2013)

(a) light reaching the forest floor

(b) surface turbulence of water

(d) water holding capacity of soil

Solution : C

21. Cuscuta is an example of : (Mains 2012)

(a) ectoparasitism

(b) brood parasitism

(d) endoparasitism

Solution : A

22. What type of human population is represented by the following age pyramid? (2011)

(a) Vanishing population

(b) Stable population

(d) Expanding population

Solution : C

23. Large woody vines are more commonly found in : (2011)

(a) temperate forests

(b) mangroves

(d) alpine forests

Solution : C

24. Consider the following four conditions (1-4). select a correct pair of them as adaptations to environment in desert lizards. (2011)

Conditions:

1.Burrowing in soil to escape high temperature.

2. Losing heat rapidly from the body during high temperature.

3. Bask in sun when temperature is low.

4. Insulating body due to thick fatty dermis.

(a) 3, 4

(b) 1, 3

(d) 1, 2

Solution : B

25.Which one of the following is categorised as a parasite in true sense? (2011)

(a) The female Anopheles bites and sucks blood from humans

(b) Human foetus developing inside the uterus draws nourishment from the mother

(d)The cuckoo (koel) lays its eggs in crow’s nest

Solution : C

26. The logistic population growth is expressed by the equation : (Mains 2011)

(a) dt/dN = Nr

(\frac{K - N}{K})

(\frac{K - N}{K})

(b) dN / dt = rN

(\frac{K - N}{K})

(d) dN / dt - rN ( N-K)

Solution : B

27. The figure given below is a diagrammatic representation of response of organisms to abiotic actors. What do (i), (ii) and (iii) represent respectively? (2010)

Solution : D

28. Which one of the following is one of the characteristics of a biological community? (2010)

(a) Stratification

(b) Natality

(d) Sex ratio

Solution : A

29. Which one of the following is most appropriately defined? (Mains 2010)

(a) Host is an organism which provides food to another organism.

(b)Amensalism is a relationship in which one species is benefitted whereas the other is unaffected.

(d)Parasite is an organism which always lives

inside the body of other organism and may kill it.

Solution : C

30. A country with a high rate of population growth took measures to reduce it. The figure below shows agesex pyramids of populations A and B twenty years apart. Select the correct interpretation about them. (2009)

Interpretations:

(a) “B” is earlier pyramid and shows stabilized growth rate.

(b) “B” is more recent showing that population is very young.

(d) “A” is more recent and shows slight reduction in the growth rate.

Solution : D

31. Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of : (2009)

(a) mesophytes

(b) epiphytes

(d) xerophytes

Solution : C

32. Consider the following four statements (1-4) about certain desert animals such as kangaroo rat. (2008)

(1) They have dark colour and high rate of reproduction and excrete solid urine.

(2) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs.

(3) They feed on dry seeds and do not require drinking water.

(4) They excrete very concentrated urine and do not use water to regulate body temperature.

Which two of the above statements for such animals are true?

(a) 3 and 1

(b) 1 and 2

(d) 2 and 3

Solution : C

33. Quercus species are the dominant component in: (2008)

(a) scrub forests

(b) tropical rain forests

(d) alpine forests

Solution : C

34. Geometric representation of age structure is a characteristic of : (2007)

(a) population

(b) landscape

(d) biotic community

Solution : A

35. The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show: (2007)

(a) The food plants mature and die at the end of the rainy season.

(b) Its population growth curve is of J type.

(d) S shaped or sigmoid growth of this insect.

Solution : B

36. If the mean and the median pertaining to certain character of a population are of the same value, the following is most likely to occur : (2007)

(a) a bimodal distribution

(b) a T shaped curve

(d) a normal distribution

Solution : D

37.A high density of elephant population in an area can result in : (2007)

(a) intraspecific competition

(b) interspecific competition

(d) mutualism

Solution : A

38. Niche overlap indicates : (2006)

(a) mutualism between two species

(b) active cooperation between two species

(d) sharing of one or more resources between the two species

Solution : D

39. More than 70% of world’s freshwater is contained in : (2005)

(a) polar ice

(b) glaciers and mountains

(d) Greenland

Solution : A

40.At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation? (2005)

(a) 66 $^{o}$ North and South
(b) 22 ${\frac{1}{2}}^{o}$ North and South
(c) 40 $^{o}$ North and South
(d) 4212 ° North and South

Solution : C

41.Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example. (2005)
(a) Colour change in Chamaeleon
(b) Enlargement of body size by swallowing air in puffer fish

(d) Melanism in moths

Solution : C

42. Which one of the following pairs is mismatched? (2005)

(a) Tundra permafrost

(b) Savanna Acacia trees

(d) Coniferous forest Evergreen trees

Solution : C

In this article we have provided you important previous year Organism And Population Class 12 NEET Questions. Solve the above all previous year Organism And Population Class 12 NEET Questions.

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Also check for,

Class 12 Ecosystem MCQs - NEET PYQ

Biodiversity And Conservation Class 12 NEET