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NEET • BIOLOGY • ORGANISMS AND POPULATION
Organisms and population practice · Mixed difficulty
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31
Easy
31 of 178
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.
32
Medium
32 of 178
Remembering
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When two related populations occupy geographically or spatially separate areas, they are called
View answer and explanation
Correct option: A
Allopatric population
Option A (Allopatric population) is correct because allopatric populations are defined as populations of the same species that are geographically isolated from each other.
33
Easy
33 of 178
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
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.
34
Easy
34 of 178
Remembering
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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
II. The organism which tolerate narrow range of salinity called …B…
Choose the correct option for A and B
View answer and explanation
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.
35
Medium
35 of 178
Remembering
+4 | -1
Which of the following does not make a nest of its own?
View answer and explanation
Correct option: C
Cuckoo
Option C (Cuckoo) is correct because cuckoos are brood parasites, meaning they lay their eggs in the nests of other birds.
36
Easy
36 of 178
Remembering
+4 | -1
Attribute of the organisms (morphological, physiological and behavioural) that enables organism to survive and reproduce in its habitat is called
View answer and explanation
Correct option: B
Adaptations
Option B (Adaptations) is correct because adaptations are the attributes that allow organisms to survive and reproduce in their environment.
37
Easy
37 of 178
Remembering
+4 | -1
Organisms that can maintain a constant internal temperature are called
View answer and explanation
Correct option: A
Homoiothermic
Option A (Homoiothermic) is correct because homoiothermic organisms maintain a constant internal body temperature regardless of the external environment.
38
Easy
38 of 178
Understanding
+4 | -1
At high altitude we feels the sickness. The reason for sickness may be due to
View answer and explanation
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.
39
Hard
39 of 178
Understanding
+4 | -1
Assertion: Plants need the help of insects and
animals for pollinating their flowers and
dispersing their seeds.
Reason: Plants offer rewards in the form of pollen
and nectar for pollinators and juicy and nutritious
fruits for seed dispersers.
animals for pollinating their flowers and
dispersing their seeds.
Reason: Plants offer rewards in the form of pollen
and nectar for pollinators and juicy and nutritious
fruits for seed dispersers.
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
Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because while both statements are true, the reason doesn't fully explain why plants need animals for pollination and seed dispersal; it only describes the rewards offered.
40
Medium
40 of 178
Understanding
+4 | -1
Biological control methods adopted in agricultural pest control are mainly based on:-
View answer and explanation
Correct option: A
Predation
Option A (Predation) is correct because biological control relies on predators to control pest populations.
41
Easy
41 of 178
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.
42
Medium
42 of 178
Application
+4 | -1
If in a pond there are 80 lotus plants last year and through reproduction 8 new plants are added, taking the current population to 88. The value of birth rate will be
View answer and explanation
Correct option: B
Option B () is correct because the birth rate is calculated by dividing the number of new plants by the initial population.
43
Medium
43 of 178
Remembering
+4 | -1
Photosynthetically Active Radiation(PAR) have the electromagnetic region of
View answer and explanation
Correct option: B
400-700 nm
Option B (400-700 nm) is correct because Photosynthetically Active Radiation (PAR) falls within the visible light spectrum, ranging from 400 to 700 nm.
44
Easy
44 of 178
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.
45
Medium
45 of 178
Understanding
+4 | -1
Plant grows best in the
I. acidic soil
II. basic soil
III. neutral soil
IV. slightly acidic soil
Choose the correct combination
I. acidic soil
II. basic soil
III. neutral soil
IV. slightly acidic soil
Choose the correct combination
View answer and explanation
Correct option: C
III and IV
Option C (III and IV) is correct because most plants thrive in neutral to slightly acidic soil conditions.
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46
Medium
46 of 178
Understanding
+4 | -1
Model is
View answer and explanation
Correct option: B
Object to which mimic resemble
Option B (Object to which mimic resemble) is correct because the model is the organism or object that the mimic imitates.
47
Hard
47 of 178
Understanding
+4 | -1
Which of the following is not a defence evolved by a prey to avoid predators?
View answer and explanation
Correct option: D
Secretion of pheromones
Option D (Secretion of pheromones) is correct because pheromones are used for communication, often attracting mates or signaling alarm to other members of the same species, not for directly avoiding predators.
48
Easy
48 of 178
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.
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.
49
Hard
49 of 178
Remembering
+4 | -1
Choose the correctly matched option:-
View answer and explanation
Correct option: D
Species-Area relationship – Alexander von Humbolt
Option D (Species-Area relationship – Alexander von Humbolt) is correct because Alexander von Humboldt is credited with describing the species-area relationship.
50
Easy
50 of 178
Analyzing
+4 | -1
Assertion: Temperature is the most ecologically relevant environmental factor.
Reason: Temperature affects the kinetics of enzyme.
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.
51
Medium
51 of 178
Understanding
+4 | -1
Nosema notabilis is an example for
View answer and explanation
Correct option: D
Hyperparasitism
Option D (Hyperparasitism) is correct because Nosema notabilis is a parasite that parasitizes another parasite, making it an example of hyperparasitism.
52
Hard
52 of 178
Application
+4 | -1
A population of 500 experiences 55 births and 5 deaths during a one-year period. What is the reproductive rate for the population during the one-year period?
View answer and explanation
Correct option: C
year
Option C ( year) is correct because the reproductive rate is calculated by (births - deaths) / population size.
53
Easy
53 of 178
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.
54
Medium
54 of 178
Understanding
+4 | -1
Life history traits of organisms have evolved in relation to the constraints imposed by which components of habitat
View answer and explanation
Correct option: D
Both (2) and (3)
Option D (Both (2) and (3)) is correct because life history traits are shaped by both abiotic (non-living) and biotic (living) components of the habitat.
55
Easy
55 of 178
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.
56
Medium
56 of 178
Remembering
+4 | -1
A secondary compound are the part of the plants
View answer and explanation
Correct option: B
Secondary metabolism
Option B (Secondary metabolism) is correct because secondary compounds are products of secondary metabolic pathways in plants.
57
Hard
57 of 178
Remembering
+4 | -1
The mimicing of monarch butterfly by the viceroy butterfly is an example of
View answer and explanation
Correct option: A
Batesian mimicry
Option A (Batesian mimicry) is correct because the viceroy butterfly mimics the monarch butterfly, which is toxic, to avoid predation. The mimic is palatable, and the model is unpalatable.
58
Medium
58 of 178
Understanding
+4 | -1
Ecologist say that niche is like a species …A…, while habitat is like a …B… there A and B indicate
View answer and explanation
Correct option: C
A-occupation; B-address
Option C (A-occupation; B-address) is correct because an ecological niche is often described as a species' "occupation" or role in the ecosystem, while a habitat is its "address" or physical location.
59
Medium
59 of 178
Application
+4 | -1
Individual alive at the beginning of 1 year to 2 year age interval is 800. During this interval 200 individual die. Then find out the death rate
View answer and explanation
Correct option: D
0.25
Option D (0.25) is correct because the death rate is calculated by dividing the number of deaths during the interval by the number of individuals alive at the beginning of the interval (200/800 = 0.25).
60
Hard
60 of 178
Understanding
+4 | -1
(A): An orchid growing as an epiphyte on a mango branch is an example of commensalism.
(R): In this interaction, the mango tree is benefited while the orchid derives no apparent benefit.
(R): In this interaction, the mango tree is benefited while the orchid derives no apparent benefit.
View answer and explanation
Correct option: C
(A) is true but (R) is false
Option C ((A) is true but (R) is false) is correct because the orchid benefits from the mango tree by gaining support and access to sunlight, while the mango tree is neither benefited nor harmed, making it commensalism. The reason is incorrect because the mango tree is not benefited.
Revision notes and key takeaways
Review ORGANISMS AND POPULATION in your textbook or class notes, then use this set to check your understanding.
Showing 31-60 of 178 questions