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NEET • BIOLOGY • ORGANISMS AND POPULATION
Organisms and population practice · Mixed difficulty
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1
Hard
1 of 178
Remembering
+4 | -1
Obligate parasites live on:
View answer and explanation
Correct option: A
living host only.
Option A (living host only.) is correct because obligate parasites can only survive and reproduce on a living host.
2
Easy
2 of 178
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.
3
Medium
3 of 178
Understanding
+4 | -1
You never see any cattle or goat browsing on Calotropis due to
View answer and explanation
Correct option: C
Formation of cardiac glycosides
Option C (Formation of cardiac glycosides) is correct because Calotropis produces cardiac glycosides, which are toxic and make the plant unpalatable to most herbivores.
4
Medium
4 of 178
Remembering
+4 | -1
A species inhabiting different geographical area is known as
View answer and explanation
Correct option: A
Allopatric
Option A (Allopatric) is correct because allopatric speciation occurs when populations are geographically isolated, leading to the evolution of distinct species.
5
Medium
5 of 178
Understanding
+4 | -1
In aquatic environment the types of benthic animals are determined by
View answer and explanation
Correct option: B
Type of sediment characteristics
Option B (Type of sediment characteristics) is correct because the sediment type directly influences the availability of food and suitable habitats for benthic animals.
6
Medium
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Analyzing
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In an area there are 200 Parthenium and is single banyan tree. Which of the conculsion (s) is/are correct?
I. Population density of banyan is low
II. Population cover area of banyan is high
III. In above cases the percentage of cover of biomass is more meaningful than population size
I. Population density of banyan is low
II. Population cover area of banyan is high
III. In above cases the percentage of cover of biomass is more meaningful than population size
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because all three conclusions are valid when comparing a large number of small plants to a single large tree.
7
Medium
7 of 178
Understanding
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Find out the correct ones
I. Mammals of colder climate generally have shorter ears and limbs to minimize heat loss
II. All organisms have behavioural adaptations that allow them to respond quickly to a stressful situation
III. Some organisms possess behavioural adaptations which allow them migrating temporarily to a less stressful situation
IV. Invertebrates and fishes live at great depths in the ocean have biochemical adaptation to cope with high pressure
I. Mammals of colder climate generally have shorter ears and limbs to minimize heat loss
II. All organisms have behavioural adaptations that allow them to respond quickly to a stressful situation
III. Some organisms possess behavioural adaptations which allow them migrating temporarily to a less stressful situation
IV. Invertebrates and fishes live at great depths in the ocean have biochemical adaptation to cope with high pressure
View answer and explanation
Correct option: C
I, III and IV
Option C (I, III and IV) is correct because these statements accurately describe adaptations to environmental conditions.
8
Hard
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Understanding
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Consider the following four statements (I-IV) about certain desert animals such as kangaroo rat.
I.They have dark colour and high rate of reproduction and excrete solid urine.
II.They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs.
III.They feed on dry seeds and do not require drinking water.
IV.They excrete very concenntated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true?
I.They have dark colour and high rate of reproduction and excrete solid urine.
II.They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs.
III.They feed on dry seeds and do not require drinking water.
IV.They excrete very concenntated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true?
View answer and explanation
Correct option: A
III and IV
Option A (III and IV) is correct because kangaroo rats feed on dry seeds without drinking water and excrete very concentrated urine to conserve water.
9
Easy
9 of 178
Understanding
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Which of the following adaptation do not lessen the impact of predation?
View answer and explanation
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.
10
Hard
10 of 178
Understanding
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Which of the following factors (given below) determines the vegetation of any area?
(i) of soil.
(ii) Mineral compositon of the soil.
(iii) Water holding capacity of soil.
(iv) Precipitation.
(i) of soil.
(ii) Mineral compositon of the soil.
(iii) Water holding capacity of soil.
(iv) Precipitation.
View answer and explanation
Correct option: C
(i), (ii), and (iii)
Option D ((i), (ii), (iii) and (iv)) is incorrect. Precipitation is a weather condition, and the question asks for factors that determine the vegetation of any area. pH, mineral composition, and water holding capacity of the soil are all factors that determine the vegetation of any area.
11
Medium
11 of 178
Remembering
+4 | -1
Sea plants are an example of
View answer and explanation
Correct option: C
hydrophyte
Option C (hydrophyte) is correct because hydrophytes are plants adapted to aquatic environments, like sea plants.
12
Easy
12 of 178
Understanding
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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
(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.
13
Hard
13 of 178
Analyzing
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Assertion (A) :Smaller the organism, higher is the rate of metabolism per gram weight
Reason (R) : The heart rate of six months old baby is much higher than that of an old person
Reason (R) : The heart rate of six months old baby is much higher than that of an old person
View answer and explanation
Correct option: A
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
Option A is correct because smaller organisms have a higher surface area to volume ratio, leading to greater heat loss and thus a higher metabolic rate, and a baby's heart rate is higher than an old person's due to higher metabolic demands.
14
Medium
14 of 178
Remembering
+4 | -1
Schimper’s second low related to
View answer and explanation
Correct option: A
Local distribution of plants
Option A (Local distribution of plants) is correct because Schimper's second law relates to the local distribution of plants based on environmental factors.
15
Hard
15 of 178
Understanding
+4 | -1
Assertion: The community of an ecotone
commonly contains the organisms of each of
the overlapping communities and in addition the
organisms which are restricted to the ecotone.
Reason: The tendency for increased variety and
density at community junctions is known as the
edge effect.
commonly contains the organisms of each of
the overlapping communities and in addition the
organisms which are restricted to the ecotone.
Reason: The tendency for increased variety and
density at community junctions is known as the
edge effect.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion
is not the correct explanation of Assertion
The correct answer is B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) because both statements are correct, but the edge effect doesn't fully explain why ecotones contain organisms from both communities and unique species.
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16
Medium
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Application
+4 | -1
If 4 individuals in a laboratory population of 40 fruitflies died during a specified time interval (i.e., a week), the death rate in the population during that period is:
View answer and explanation
Correct option: B
0.1
Option B (0.1) is correct because the death rate is calculated by dividing the number of deaths by the total population.
17
Hard
17 of 178
Remembering
+4 | -1
Pseudo copulation occurs in
View answer and explanation
Correct option: B
Ophrys
Option B (Ophrys) is correct because Ophrys orchids exhibit pseudo-copulation, where the flower mimics a female insect, attracting male insects for pollination.
18
Easy
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Understanding
+4 | -1
Regulators are the their animals which
View answer and explanation
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.
19
Medium
19 of 178
Remembering
+4 | -1
Life on earth originated in
View answer and explanation
Correct option: B
Water
Option B (Water) is correct because scientific evidence suggests that life originated in aquatic environments due to the presence of necessary elements and conditions.
20
Medium
20 of 178
Remembering
+4 | -1
The soil with poorest water holding capacity is
View answer and explanation
Correct option: C
Sandy
Option C (Sandy) is correct because sandy soil has the largest particles and therefore the poorest water holding capacity.
21
Medium
21 of 178
Remembering
+4 | -1
Pedology refers to study of
View answer and explanation
Correct option: A
Soil
Option A (Soil) is correct because pedology is the scientific study of soil, including its formation, classification, and mapping.
22
Easy
22 of 178
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 cycle.
Choose the combinations of correct option
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 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.
23
Medium
23 of 178
Understanding
+4 | -1
Among four basic processes, which contribute more significantly to population growth if a habitat is colonised newly?
View answer and explanation
Correct option: D
Immigration
Option D (Immigration) is correct because immigration, the influx of new individuals, directly adds to the population size in a newly colonized habitat.
24
Easy
24 of 178
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.
25
Easy
25 of 178
Understanding
+4 | -1
The relation between algae and fungi in a lichen is
View answer and explanation
Correct option: A
Symbiosis
Option A (Symbiosis) is correct because lichens represent a mutually beneficial relationship between algae and fungi.
26
Medium
26 of 178
Analyzing
+4 | -1
Statement I: The number of fish caught per trap is good enough measure of its population density in the lake.
Statement II: For certain ecological investigations, there is no need to know the absolute population densities: relative densities serve the purpose equally well.
Statement II: For certain ecological investigations, there is no need to know the absolute population densities: relative densities serve the purpose equally well.
View answer and explanation
Correct option: C
Both statements I and II are correct
Option C (Both statements I and II are correct) is correct because both relative and absolute densities can be useful in ecological studies.
27
Medium
27 of 178
Understanding
+4 | -1
To a large extent the vegetation in any area is determined by
View answer and explanation
Correct option: C
pH, mineral composition and topography.
The correct answer is C (pH, mineral composition and topography) because these factors significantly influence plant distribution and vegetation type.
28
Medium
28 of 178
Remembering
+4 | -1
Monarch butterflies are highly distasteful to predator due to
View answer and explanation
Correct option: B
A special chemical present in its body
Option B (A special chemical present in its body) is correct because monarch butterflies sequester chemicals from milkweed plants, making them distasteful to predators.
29
Medium
29 of 178
Analyzing
+4 | -1
Assertion: Photosynthesis is an essential life process of plants.
Reason: Small plants growing in forest are adapted to other process than photosynthesis because they are over-shadowed by tall canopied trees
Reason: Small plants growing in forest are adapted to other process than photosynthesis because they are over-shadowed by tall canopied trees
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 photosynthesis is essential, and small plants may have adaptations to other processes, but the latter isn't *because* of being overshadowed.
30
Easy
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Understanding
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I. Birds II. Family – Asteraceae
III. Polar bear IV. Human
V. Lizards VI. Amphibians
VII. Coconut
Identify stenothermals from the given examples
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.
Revision notes and key takeaways
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Key Takeaways
- ✓ This set contains 178 single-correct-answer MCQs on ORGANISMS AND POPULATION.
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Showing 1-30 of 178 questions