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NEET Exam  >  NEET Test  >  NCERT Based Tests  >  Assertion & Reason Test: Organisms & Populations - NEET MCQ

Organisms & Populations - Free Assertion Reason Questions with Solutions


MCQ Practice Test & Solutions: Assertion & Reason Test: Organisms & Populations (10 Questions)

You can prepare effectively for NEET NCERT Based Tests for NEET with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Assertion & Reason Test: Organisms & Populations". These 10 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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Assertion & Reason Test: Organisms & Populations - Question 1
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Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion (A) : The human population represents the logistic growth curve.

Reason (R) : When the resources are limited leading to competition between individuals and survival of fittest, the population tends to grow in a logistic manner.

Detailed Solution: Question 1

The human population represents the logistic growth curve as the numbers of human beings are increasing rapidly but available resources are not increasing at the same pace. Such a growth pattern is not sustainable because at one point the human population would reach a place where there would not be enough resources for everyone.

Topic in NCERT: Logistic growth

Line in NCERT: "No population of any species in nature has at its disposal unlimited resources to permit exponential growth. This leads to competition between individuals for limited resources."

Assertion & Reason Test: Organisms & Populations - Question 2
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Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion : Natality rate increases the population size and population density both.
Reason : Natality increases the number of individuals in an area by births.

Detailed Solution: Question 2

Correct answer is D. Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

  • Natality rate, also known as the birth rate, represents the number of births in a population over a specific period.
  • Natality indeed increases the number of individuals in a population by contributing new individuals through births.
  • When natality rate is high, it leads to an increase in the population size, as more individuals are being added through births.
  • The increase in population size, in turn, affects population density, which is the number of individuals per unit area.
  • Therefore, both the population size and population density increase when the natality rate is high.

Topic in NCERT: Natality

Line in NCERT: "Natality refers to the number of births during a given period in the population that are added to the initial density."

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Assertion & Reason Test: Organisms & Populations - Question 3
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Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion (A) : Ecology is concerned with four levels of biological organisation.

Reason (R) : Organisms, populations, communities and biomes are four levels of biological organisation.

Detailed Solution: Question 3

Ecology includes six levels of organization that are organism, population, community, ecosystem, biosphere and biome.

Topic in NCERT: Ecology

Line in NCERT: "Ecology is basically concerned with four levels of biological organisation - organisms, populations, communities and biomes."

Assertion & Reason Test: Organisms & Populations - Question 4
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Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion (A) : Small animals are rarely found in polar regions.

Reason (R) : Heat loss or heat gain is a function of surface area. Large surface area, great loss of heat.

Detailed Solution: Question 4

Small animals have a large surface area with respect to their volume, so they lose body heat fast if it is cold outside, small animals are rarely found in polar regions.

Assertion & Reason Test: Organisms & Populations - Question 5
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Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion (A) : Many freshwater animals cannot live for long in sea water.

Reason (R) : Freshwater animals face osmotic problems in sea water.

Detailed Solution: Question 5

When freshwater animals move into sea, water continuously moves out of the animal’s body through the process of osmosis.

Assertion & Reason Test: Organisms & Populations - Question 6
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Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion (A) : Population has certain attributes which an individual organism does not have.

Reason (R) : Population is a group of people living in a well defined area, at a particular time.

Detailed Solution: Question 6

Population is a group of people therefore it's attributes are different from an individual organism.

Topic in NCERT: Population Attributes

Line in NCERT: "A population has certain attributes whereas, an individual organism does not."

Assertion & Reason Test: Organisms & Populations - Question 7
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Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion (A) : Clown fish maintains a commensalistic relation with the sea anemone.

Reason (R) : In this interaction, one species benefits and the other is neither harmed nor benefited.

Detailed Solution: Question 7

Clown fish maintain a commensalistic relation with the sea anemone. In this interaction, one species benefits and the other is neither harmed nor benefited. Sea anemone has stinging tentacles that provide protection to Clown fish from predators. The sea anemone does not appear to derive any benefit from the clownfish.

Topic in NCERT: Commensalism

Line in NCERT: "Another example of commensalism is the interaction between sea anemone that has stinging tentacles and the clown fish that lives among them. The fish gets protection from predators which stay away from the stinging tentacles. The anemone does not appear to derive any benefit by hosting the clown fish."

Assertion & Reason Test: Organisms & Populations - Question 8
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Assertion (A): Brood parasitism is a strategy used by some birds to increase their reproductive success by laying eggs in the nests of other bird species.

Reason (R):
This behavior has evolved because the host birds are unable to recognize foreign eggs due to their similar appearance in size and color.

Detailed Solution: Question 8

  • The Assertion is correct because it accurately describes brood parasitism as a reproductive strategy among certain bird species.
  • The Reason is also correct; it explains that the similarity in egg appearance reduces the chances of host birds detecting and ejecting the foreign eggs.
  • Since the Reason explains why the Assertion is true, we conclude that both the Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.

Assertion & Reason Test: Organisms & Populations - Question 9
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Assertion (A): Plants have developed various chemical defenses to deter herbivores from feeding on them.

Reason (R): Chemical defenses in plants are solely for attracting pollinators.

Detailed Solution: Question 9

- The assertion is correct; plants do have a range of chemical defenses aimed at deterring herbivores, which can include toxic compounds and substances that inhibit feeding.

- The reason is false; while some chemical compounds can attract pollinators, the primary purpose of many plant chemicals is indeed to protect against herbivores, not to attract them.

- Therefore, the reason does not correctly explain the assertion, making Option B the right choice.

Assertion & Reason Test: Organisms & Populations - Question 10
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Assertion (A): Organisms that breed multiple times during their lifetime often display greater adaptability to changing environmental conditions.

Reason (R): Organisms that reproduce only once in their lifetime tend to have a higher overall reproductive success compared to those that breed multiple times.

Detailed Solution: Question 10

  • Assertion Analysis: The assertion is true. Organisms that breed multiple times can adapt better to environmental changes because they have more opportunities to reproduce and pass on advantageous traits.
  • Reason Analysis: The reason is false. While some organisms that reproduce once may have high reproductive success, this does not universally apply to all species, especially given the variability of environmental pressures.
  • Explanation: Therefore, while both statements are true, the reason does not correctly explain the assertion, as the success of breeding multiple times is context-dependent and can enhance adaptability rather than diminish it.

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About this NEET Practice Test

This test contains 10 MCQs on Assertion & Reason Test: Organisms & Populations with detailed solutions for each question. It is part of the NCERT Based Tests for NEET course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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