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Q. No.For chemical defense against herbivores, Calotropis has
1.
Cardiac glycosides
2.
strychnine
3.
toxic ricin
4.
distasteful quinine
Subtopic: Population Interactions: Predation |
85%
From NCERT
NEET - 2023
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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)
In the light of the above statements, choose the correct answer from the options given below:
| 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 |
| 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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