There are 250 snails in a pond and within a year their number increases to 2500 by reproduction. What should be their birth rate (in per snail per year)?
1. 10 2. 9
3. 25 4. 15

Subtopic:  Population Characters: Natality & Mortality |
From NCERT
NEET - 2023
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): A person goes to high altitude and experiences "Altitude Sickness" with symptoms like breathing difficulty and heart palpitations.
Reason (R): Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen
In the light of the above statements, choose the correct answer from the options given below:
1. (A) is True but (R) is False
2. (A) is False but (R) is True
3. Both (A) and (R) are True and (R) is the correct explanation of (A)
4. Both (A) and (R) are True but (R) is not the correct explanation of (A)
Subtopic:  Adaptations (OLD NCERT) |
 88%
From NCERT
NEET - 2023
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Given below are two statements: 
Assertion (A): Many species of small plants (herbs and shrubs) growing in forest are adapted to photosynthesize optimally under very low light conditions
Reason (R): Small plants are constantly over-shadowed by tall canopied trees.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Abiotic Factors: Light & Water (OLD NCERT) |
 86%
From NCERT
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Given below are two statements: 
Assertion (A): The availability of light on land is closely linked with that of temperature.
Reason (R): Sun is the source of both available light and temperature on land.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Abiotic Factors: Temperature (OLD NCERT) | Abiotic Factors: Light & Water (OLD NCERT) |
 84%
From NCERT
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Given below are two statements: 
Assertion (A): Constant internal environment enhances overall 'fitness' of the species.
Reason (R): Homeostasis permits all biochemical reactions and physiological functions to proceed with maximal efficiency.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Response of Organisms to Abiotic Factors (OLD NCERT) |
 79%
From NCERT
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Given below are two statements: 
Assertion (A): Small animals tend to lose body heat very fast when it is cold outside.
Reason (R): Heat loss is a function of body volume.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Abiotic Factors: Temperature (OLD NCERT) |
From NCERT
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Given below are two statements: 
Assertion (A): A population has certain attributes like birth rates and death rates while an individual organism does not.
Reason (R): The birth and death rates are expressed as change in numbers w.r.t. members of a population.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Population Attributes |
From NCERT
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Given below are two statements: 
Assertion (A): Certain exotic species become invasive and start spreading very fast in a geographical area.
Reason (R): The invaded land does not have natural predators of exotic species.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Population Interactions: Predation |
 88%
From NCERT
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Given below are two statements: 
Assertion (A): Ten species of invertebrates became extinct within a year when all the starfish were removed from an enclosed intertidal zone.
Reason (R): Starfish is an important predator which reduces intensity of competition among invertebrates
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.


 
Subtopic:  Population Interactions: Predation |
 85%
From NCERT
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Given below are two statements: 
Assertion (A): Some species of insects and frogs are cryptically coloured to avoid being detected easily by the predator.
Reason (R): Monarch butterfly develops a special chemical in its body by feeding on a poisonous weed at caterpillar stage.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Population Interactions: Predation |
 83%
From NCERT
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