Organisms And Populations — DPP 1

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.

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1
Ecology is basically concemed with four components which are;
(I) Cells
(II) Tissues
(III) Organs
(IV) Population
(V) Organisms
(VI) Communities
(VII) Biomes
  1. A (I), (II), (III) and (IV)
  2. B (II), (III), (IV) and (V)
  3. C (III), (IV), (V) and (VI)
  4. D (IV), (V), (VI) and (VII)
Show answer

Correct answer: D

2
In a pond there were 20 lotus plants last year and through reproduction 8 new plant are added, taking the current population to 28. What is the birth rate?
  1. A 0.28 offspring per lotus per year
  2. B 0.8 offspring per lotus per year
  3. C 0.32 offspring per lotus per year
  4. D 0.4 offspring per lotus per year
Show answer

Correct answer: D

3
Predation performs all, except;
  1. A transfer of energy.
  2. B keeps prey population under control.
  3. C loss of sense organs.
  4. D maintains species diversity.
Show answer

Correct answer: C

4
Few interactions are given below. How many of them are NOT examples of mutualism?
A. Fungus & roots of higher plants - mycorrhiza
B. Clown fish and sea anemones
C. Cuckoo and crow
D. Orchids and bumblebees
E. Cuscuta and Hedge plants
  1. A 3
  2. B 5
  3. C 4
  4. D 2
Show answer

Correct answer: A

5
While developing theory of natural selection, Darwin observed that each species could fully realise its innate potential to grow in number provided in a particular habitat ____________.
  1. A favourable environmental conditions are prevalent
  2. B natural disasters like floods and famine are absent
  3. C unlimited resources are available
  4. D mutations develop in certain species
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Correct answer: C

6
Biotic potential is;
  1. A intrinsic rate of natural increase under environmental limited condition.
  2. B intrinsic rate of natural increase under environmental unlimited condition.
  3. C extrinsic rate of natural increase under environmental limited conditions.
  4. D extrinsic rate of natural increase under environmental unlimited conditions.
Show answer

Correct answer: B

7
If B = 0.55 , D = 0.45 and N = 1000, then dN/dt = ________.
  1. A 5500
  2. B 1000
  3. C 100
  4. D 4500
Show answer

Correct answer: C

8
Some organisms breed only once in their life-time like;
  1. A pacific salmon fish.
  2. B most birds.
  3. C mammals.
  4. D None of these
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Correct answer: A

9
In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as;
  1. A 25 millions.
  2. B 17 millions.
  3. C 20 millions.
  4. D 18 millions.
Show answer

Correct answer: B

10
In a field experiment, when all the starfish were removed from an enclosed intertidal area, more than _________ (a) ________ species of invertebrates become extinct within a year, because of _______ (b) ______ competition.
  1. A (a) - 10; (b) - intraspecific
  2. B (a) - 10;(b) - interspecific
  3. C (a) - 20; (b) - intraspecific
  4. D (a) - 20; (b) - interspecific
Show answer

Correct answer: B

11
Assertion (A): Barnacles growing on the back of a whale benefit but whale neither benefited nor harmed.
Reason (R): Commensalism is the interaction in which one species benefits and other is harmed.
  1. A Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
  2. B Both Assertion (A) and Reason (R) are 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: C

12
For the defence against predators, butterflies become highly distasteful due to having certain chemical in their bodies. What is the source of the chemical?
  1. A The butterflies has genes for synthesis of this chemical in its each and every cell.
  2. B The butterfly acquires this chemical during its caterpillar stage by feeding on a poisonous plant.
  3. C The chemical accumulates in the cells of butterfly when it feeds sap of a plant.
  4. D The butterfly secretes the chemical from its corpus allatum.
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Correct answer: B

13
What is true for individuals of same species?
  1. A Live in same niche
  2. B Live in same habitat
  3. C Interbreeding
  4. D Live in different habitat
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Correct answer: C

14
Mark the correct statements with respect to ecology.
A. It includes study of interactions among organisms only.
B. The biological organization does not include communities.
C. Human intestine is a unique habitat for hundreds of species of microbe.
D. The size of a population for any species is not a static parameter.
  1. A A and D
  2. B C and D
  3. C B and C
  4. D A and B
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Correct answer: B

15
Grass is eaten by cow. Which type of population interaction is shown in this case?
  1. A Parasitism
  2. B Mutualism
  3. C Commensalism
  4. D Predation
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Correct answer: D

16
Inter-specific interaction could be;
  1. A beneficial.
  2. B detrimental.
  3. C neutral.
  4. D All of these
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Correct answer: D

17
Assertion (A): When certain exotic species are introduced into a geographical area, they become invasive and start spreading fast.
Reason (R): The invaded land does not have natural predator of that particular exotic species.
  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: A

18
The top tier in population age pyramid denotes:
  1. A old women
  2. B old men
  3. C "post reproductive aged" people.
  4. D youth population.
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Correct answer: C

19
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. A 15
  2. B 5
  3. C 0
  4. D 10
Show answer

Correct answer: C

20
Which of the following would necessarily decrease the density of a population in a given habitat?
  1. A Natality and mortality
  2. B Immigration and emigration
  3. C Mortality and emigration
  4. D Natality and immigration
Show answer

Correct answer: C

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