Number of individuals leaving the habitat

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NEET • BIOLOGY • ORGANISMS AND POPULATION

Organisms and population practice · Easy

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Showing 1-30 of 64 questions

1 Easy

1 of 64

Remembering +4 | -1

Natality refers to

View answer and explanation

Correct option: A

Birth rate

Option A (Birth rate) is correct because natality refers to the rate at which new individuals are born into a population.

2 Easy

2 of 64

Understanding +4 | -1

Which of the following adaptation do not lessen the impact of predation?

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Correct option: D

Different feeding habits of finches.

Option D (Different feeding habits of finches) is correct because different feeding habits of finches is an example of resource partitioning and character displacement, not an adaptation to lessen predation.

3 Easy

3 of 64

Understanding +4 | -1

Which of the given contribute to increase the population density during a given period in an area?
(i) Natality (ii) Mortality (iii) Immigration (iv) Emigration

View answer and explanation

Correct option: C

Both (i) and (iii)

Option A (If the population density reaches the carrying capacity) is correct because the asymptote in population growth is reached when the population density equals the carrying capacity of the environment.

4 Easy

4 of 64

Understanding +4 | -1

Regulators are the their animals which

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Correct option: B

Can maintains their body homeostasis

Option B (Can maintains their body homeostasis) is correct because regulators are organisms that can maintain a stable internal environment regardless of external conditions.

5 Easy

5 of 64

Understanding +4 | -1

I. Many xerophytic plants have thick cuticle on leaf epidermis and sunken stomata
II. Some xerophytic plants have special photosynthetic pathway (CAM) that enables their stomata close during day
III. Opuntia has spines (modified leaves), photosynthetic phylloclade (stem)
IV. All adaptations are genetically fixed in all organisms
(v) In Opuntia, the pathway of photosynthesis is through

C_3

cycle.
Choose the combinations of correct option

View answer and explanation

Correct option: D

I, II, III and V

Option D (I, II, III and V) is correct because xerophytes have thick cuticles and sunken stomata, CAM pathways, modified leaves and stems, and Opuntia uses the C3 cycle.

6 Easy

6 of 64

Remembering +4 | -1

Mortality refers to

View answer and explanation

Correct option: A

Death rate

Option A (Death rate) is correct because mortality is the term used to describe the rate of death in a population.

7 Easy

7 of 64

Understanding +4 | -1

The relation between algae and fungi in a lichen is

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Correct option: A

Symbiosis

Option A (Symbiosis) is correct because lichens represent a mutually beneficial relationship between algae and fungi.

8 Easy

8 of 64

Understanding +4 | -1

I. Birds II. Family – Asteraceae
III. Polar bear IV. Human
V. Lizards VI. Amphibians
VII. Coconut
Identify stenothermals from the given examples

View answer and explanation

Correct option: A

III, V, VI and VII

Option A (III, V, VI and VII) is correct because stenothermals are organisms that can only survive within a narrow temperature range, and polar bears, lizards, amphibians, and coconuts fit this description.

9 Easy

9 of 64

Understanding +4 | -1

Keystone species deserve protection because these

View answer and explanation

Correct option: D

Play an important role in supporting other species

Option D (Play an important role in supporting other species) is correct because keystone species have a disproportionately large impact on their environment relative to their abundance, often maintaining the structure of the community.

10 Easy

10 of 64

Understanding +4 | -1

An overwhelming majority …A… of animals and nearly all plants cannot maintain a constant internal environment. Their body temperature …B… with the ambient temperature. In aquatic animals, the osmotic concentration of the body fluids …C… with that of the ambient water osmotic concentration. These animals and plants are simply conformers
Choose the correct option for A , B and C

View answer and explanation

Correct option: D

A-99%, B-Changes, C-Changes

Option D (A-99%, B-Changes, C-Changes) is correct because the majority of animals and nearly all plants are conformers, meaning their body temperature and osmotic concentration change with the ambient environment.

11 Easy

11 of 64

Remembering +4 | -1

The organism which tolerate wide range of salinity called …A…
II. The organism which tolerate narrow range of salinity called …B…
Choose the correct option for A and B

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Correct option: B

A–euryhaline; B–stenohaline

Option B (A–euryhaline; B–stenohaline) is correct because euryhaline organisms tolerate a wide range of salinity, while stenohaline organisms tolerate a narrow range.

12 Easy

12 of 64

Remembering +4 | -1

Attribute of the organisms (morphological, physiological and behavioural) that enables organism to survive and reproduce in its habitat is called

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Correct option: B

Adaptations

Option B (Adaptations) is correct because adaptations are the attributes that allow organisms to survive and reproduce in their environment.

13 Easy

13 of 64

Remembering +4 | -1

Organisms that can maintain a constant internal temperature are called

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Correct option: A

Homoiothermic

Option A (Homoiothermic) is correct because homoiothermic organisms maintain a constant internal body temperature regardless of the external environment.

14 Easy

14 of 64

Understanding +4 | -1

At high altitude we feels the sickness. The reason for sickness may be due to

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Correct option: A

Low atmospheric pressure

Option A (Low atmospheric pressure) is correct because at high altitudes, the lower atmospheric pressure results in less oxygen availability, leading to altitude sickness.

15 Easy

15 of 64

Remembering +4 | -1

Average temperature of thermal springs and deep sea hydrothermal vents exceeds

View answer and explanation

Correct option: D

100℃

Option D (100℃) is correct because thermal springs and deep-sea hydrothermal vents can reach temperatures exceeding 100 degrees Celsius due to geothermal activity.

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16 Easy

16 of 64

Understanding +4 | -1

Why a population fluctuate when it reaches to carrying capacity?

View answer and explanation

Correct option: A

Due to limiting factors

Option A (Keystone species) is correct because keystone species have a disproportionately large effect on their environment relative to their abundance, and their removal can significantly alter the community structure.

17 Easy

17 of 64

Analyzing +4 | -1

Assertion (A) : A mangrove tree growing in marshy place does not have pneumatophores.

Reason (R) : Pneumatophores help in taking in air from atmosphere deficient saline soil.

View answer and explanation

Correct option: D

If A is false, but R is true

Option D (If A is false, but R is true) is correct because mangrove trees in marshy places *do* have pneumatophores, and the reason correctly explains their function.

18 Easy

18 of 64

Analyzing +4 | -1

Assertion: Temperature is the most ecologically relevant environmental factor.

Reason: Temperature affects the kinetics of enzyme.

View answer and explanation

Correct option: B

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

The correct answer is B (If both the assertion and reason are true but the reason is not a correct explanation of the assertion) because temperature is ecologically relevant, and temperature affects enzyme kinetics, but enzyme kinetics is not the only reason for temperature's ecological relevance.

19 Easy

19 of 64

Remembering +4 | -1

The niche of a population is defined as

View answer and explanation

Correct option: C

Set of conditions and resources it uses

Option C (Set of conditions and resources it uses) is correct because a niche encompasses all the environmental factors and resources a species utilizes for survival and reproduction.

20 Easy

20 of 64

Remembering +4 | -1

Which horizon in soil profile is known as top soil?

View answer and explanation

Correct option: B

A-horizon

Option B (A-horizon) is correct because the A-horizon in the soil profile is commonly referred to as the topsoil.

21 Easy

21 of 64

Remembering +4 | -1

Cold-blooded animals fall under the category of

View answer and explanation

Correct option: A

Ectotherms

Option A (Ectotherms) is correct because cold-blooded animals rely on external sources for body heat, which is characteristic of ectotherms.

22 Easy

22 of 64

Understanding +4 | -1

Mark the wrong match.

View answer and explanation

Correct option: B

Cattle and cattle egret – Mutualism

Option B (Growth rate being almost zero) is correct because a stable population has a birth rate approximately equal to its death rate, resulting in a near-zero growth rate.

23 Easy

23 of 64

Application +4 | -1

After poaching 3 lions in a certain forest of Gujarat, only 15 are left in a year. Determine the death rate
per capita.

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Correct option: C

0.166

Option B (0.2) is correct because the death rate per capita is calculated by dividing the number of deaths by the initial population size (3/15 = 0.2).

24 Easy

24 of 64

Remembering +4 | -1

In the association between two organisms, if one organism is benefitted and the other is not benefitted, this relationship is known as

View answer and explanation

Correct option: C

Commensalism

Option C (Commensalism) is correct because commensalism is defined as a relationship where one organism benefits and the other is neither benefited nor harmed.

25 Easy

25 of 64

Understanding +4 | -1

Which of the following supports a dense population of plankton and littoral vegetation?

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Correct option: B

Eutrophic

Option B (Eutrophic) is correct because eutrophic environments are rich in nutrients, supporting a dense population of plankton and littoral vegetation.

26 Easy

26 of 64

Understanding +4 | -1

‘Cryptically-coloured’ (camouflaged) is a technique through which prey can

View answer and explanation

Correct option: B

Lessen the impact of predator

Option B (Lessen the impact of predator) is correct because camouflage helps prey avoid detection by predators, reducing predation risk.

27 Easy

27 of 64

Remembering +4 | -1

According to Bergmann's rule, the mammals from cold climate have

View answer and explanation

Correct option: A

Larger body and short extremities

Option A (Larger body and short extremities) is correct because Bergmann's rule states that animals in colder climates tend to have larger bodies and shorter appendages to conserve heat.

28 Easy

28 of 64

Understanding +4 | -1

Which of the given population interaction is seen between plant and pollinators?

View answer and explanation

Correct option: C

Mutualism

Option A (extinction) is correct because intense competition between species can lead to the elimination of one of the species, resulting in extinction or competitive exclusion.

29 Easy

29 of 64

Understanding +4 | -1

Many fishes of freshwater can’t live in sea water and vice-versa because of

View answer and explanation

Correct option: B

Osmotic problems

Option B (Osmotic problems) is correct because freshwater and saltwater fishes have different osmotic regulations, and transferring them to the wrong environment causes osmotic stress.

30 Easy

30 of 64

Remembering +4 | -1

Hibernation is

View answer and explanation

Correct option: A

Winter sleep under ground

Option A (Winter sleep under ground) is correct because hibernation is a state of inactivity during winter, often spent in a sheltered underground location.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 64 single-correct-answer MCQs on ORGANISMS AND POPULATION.
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