Organisms And Populations — DPP 2

20 NEET questions from Organisms And Populations, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Find the mismatched pair.
  1. A Mutualism - both species are benefitted
  2. B Ammensalism - one species is harmed the other one is unaffected
  3. C Competition - only one species is harmed, the other one gets benefitted
  4. D Predation - one species is benefitted and the other gets harmed
Show answer

Correct answer: C

2
How many statements are correct.
A. Emigration is the number of individuals of the population who left the habitat and gone elsewhere permanently.
B. Predators have an ability to overexploit their only food resource but choose not to.
C. Population ecology links ecology to population genetics and evolution.
D. dN/dt describes the exponential or geometric growth pattern of a population and results in a sigmoid curve.
E. Populations have attributes that individual organisms do not - birth rates and death rates, sex ratio and age distribution.
  1. A 1
  2. B 2
  3. C 3
  4. D All are correct
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Correct answer: C

3
Which of the given factors decrease the population size of a species?
A. Natality
B. Mortality
C. Immigration
D. Emigration
  1. A A, B
  2. B B, C
  3. C C, D
  4. D B, D
Show answer

Correct answer: D

4
Find out the incorrect statement.
  1. A In brood parasitism (of Koel and Crow), the eggs of parasitic bird have evolved to resemble the host's egg in size and colour to reduce the chance of the host bird detecting the foreign eggs and ejecting them from the host.
  2. B Majority of the parasites harm the host; they may reduce the survival, growth and reproduction of the host and reduce its population density.
  3. C Many parasites have evolved to the host specific in such a way that both host and the parasite end to co-evolve.
  4. D Monarch butterfly acquire chemical by feeding on a poisonous weed in its adult stage, that chemical makes it high distasteful to its bird.
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Correct answer: D

5
Choose the correct statements about mutualism.
A. Plants need the help of animal for pollinating their flower and dispersal of their seeds.
B. The lichens represent an intimate mutualistic relationship between a fungus and algae.
C. The wasp and fig plant is an example for mutualism.
  1. A A and B
  2. B B and C
  3. C A and C
  4. D All of these
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Correct answer: D

6
If in a pond there were 20 lotus plants last year and through reproduction 8 new plants were added, then the natality is:
  1. A 8/20 per year
  2. B 8/28 per year
  3. C 28/8 per year
  4. D 20/8 per year
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Correct answer: A

7
Statement-I: The development of a habitat of an organism is solely dependent on the type of biotic components present in it with which they interact continuously.
Statement-II: The geographical distribution of an organism is largely dependent on their ability to dominate other species present in that region.
  1. A Both Statement-I and Statement-II are correct.
  2. B Both Statement-I and Statement-II are incorrect.
  3. C Statement-I is correct and Statement-II is incorrect.
  4. D Statement-I is incorrect and Statement-II is correct.
Show answer

Correct answer: B

8
Which of the following is true concerning exponential growth?
  1. A No population can grow exponentially for long.
  2. B Exponential growth slows down as the population reaches near its maximal size.
  3. C Bacterial colonies have been observed to maintain exponential growth for over a month.
  4. D Exponential growth is commonly observed in large, slow growing species such as humans and elephants.
Show answer

Correct answer: A

9
Read the following statements carefully and choose the incorrect one.
  1. A Nicotine, caffeine, quinine, strychnine, opium etc., are products of plants produced specifically for commercial purposes.
  2. B In some types of competition, resources need not be limiting for competition to occur.
  3. C A given habitat has enough resources to support a maximum possible number, beyond which no further growth is possible, this limit is denoted by K.
  4. D A population growing in a habitat with limited resources shows an initial lag phase, followed by phases of acceleration and deceleration.
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Correct answer: A

10
Choose the correct statements.
A. Maximum stable population that a particular environment can support over a long period of time is the carrying capacity.
B. Point of stabilisation represents the maximum carrying capacity of the given environment.
C. Size of a population shows fluctuations around carrying capacity.
  1. A A and B
  2. B B and C
  3. C A and C
  4. D All of these
Show answer

Correct answer: D

11
Vital index of a population is;
  1. A $\frac{\mathrm{B}}{\mathrm{D}} \times 100$
  2. B $\mathrm{B}-\mathrm{D}$
  3. C $\frac{\mathrm{D}}{\mathrm{B}} \times 100$
  4. D $\mathrm{B}+\mathrm{D}$
Show answer

Correct answer: A

12
Assertion (A): Competition occurs when closely related species compete for the same resources that are abundant.
Reason (R): Interspecific competition is a potent source in organic evolution.
  1. A Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct explanation of Assertion (A).
  2. B Both Assertion (A) and Reason (R) are the true but Reason (R) is NOT a correct explanation of Assertion (A).
  3. C Assertion (A) is true and Reason (R) is false.
  4. D Assertion (A) is false and Reason (R) is true.
Show answer

Correct answer: D

13
Which of the following can't be considered a "Population".
  1. A Duck in wet land
  2. B Rats in abandoned dwelling
  3. C Birds and animals in a zoo.
  4. D Bacteria in a culture plate.
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Correct answer: C

14
Find the mismatched pair.
  1. A Copepods - Ectoparasites
  2. B Cuckoo and crow - brood parasitism
  3. C Female Anopheles mosquito - parasite on humans
  4. D Human liver fluke - trematode parasite
Show answer

Correct answer: C

15
A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?
  1. A 128
  2. B 24
  3. C 64
  4. D 32
Show answer

Correct answer: C

16
Choose the correct statements about competition.
A. Unrelated species could also compete for the same resource.
B. Resources need not be limited for competition to occur.
C. When resources are limited, the competitively superior species will eventually eliminate the other species as per Gause‘s competitive exclusion principle.
  1. A A and B
  2. B B and C
  3. C A and C
  4. D All of these
Show answer

Correct answer: D

17
Find the mismatched pair.
  1. A Interference competition - Abingdon tortoise and Goat in Galapagos island.
  2. B Competitive release - visiting flamingoes and resident fishes in shallow South American lakes.
  3. C Resource partitioning - Five closely related species of warblers living on the same tree.
  4. D Competition - Superior barnacle Balanus dominates and excludes smaller barnacle Chathamalus.
Show answer

Correct answer: B

18
$\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left(\frac{\mathrm{K}-\mathrm{N}}{\mathrm{K}}\right)$
In the above equation if $\mathrm{K}=\mathrm{N}$ then, it implies that:
I. Growth rate will become Zero.
II. Population start decreasing.
III. Population size reaches the carrying capacity.
Choose the correct option.
  1. A I only
  2. B II, III
  3. C I, II
  4. D I, III
Show answer

Correct answer: D

19
Read the following statements carefully and choose the correct one.
  1. A The primary and only reason for competition to occur among species is the limited availability of resources (food).
  2. B A group of individuals resulting from asexual reproduction is not considered as a population.
  3. C In a new habitat which is just being colonized, immigration has more weightage than birth rates in population growth.
  4. D In 1981, the r value for human population in India was 0.205.
Show answer

Correct answer: C

20
Select the option containing correct statements.
A. The r value is used in assessing impacts of biotic factors only, on population growth.
B. In a logistic growth curve, the asymptote condition arises when population density reaches nature's carrying capacity.
C. Populations evolve to maximize their Darwinian fitness that is low r value, in the habitat in which they live.
D. Predation is the only way of transferring energy fixed by plants to higher trophic levels.
  1. A A and B
  2. B A and C
  3. C B and D
  4. D C and D
Show answer

Correct answer: C

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