Given below are two statements:
Assertion (A):
The cell walls of diatoms are indestructible
Reason (R):
In diatoms, cell walls are embedded with silica
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: Â Kingdom Protista: Chrysophytes |
 77%
From NCERT
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| Assertion (A): | Diatoms leave behind large amount of cell wall deposits in their habitat which gets accumulated over billions of years |
| Reason (R): | -Silicious cell walls in diatoms are indestructible |
| 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: Â Kingdom Protista: Chrysophytes |
 83%
From NCERT
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Given below are two statements:
| Assertion (A): | Infectious agent discovered by T.O. Diener, lack protein coat that is found in viruses |
| Reason (R): | Viroids have RNA of low molecular weight |
| 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: Â Virus, Viroids & Prions |
 73%
From NCERT
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Given below are two statements:
| Assertion (A): | Deuteromycetes are commonly known as imperfect fungi |
| Reason (R): | Sexual reproduction is absent in the members of the deuteromycetes |
| 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: Â Kingdom Fungi: Deuteromycetes |
From NCERT
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Given below are two statements:
| Assertion (A): | Viruses can pass through bacteria-proof filters |
| Reason (R): | Viruses could be crystallized and crystals consist largely of proteins |
| 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: Â Virus, Viroids & Prions |
 79%
From NCERT
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Given below are two statements:
| Assertion (A): | Neurospora crassa is a widely used model organism in experimental genetics |
| Reason (R): | Neurospora crassa produces a large number of antibacterial and antifungal drugs |
| 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: Â Kingdom Fungi: Ascomycetes |
From NCERT
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Given below are two statements:
| Assertion (A): | Bacteriophages are the viruses that infect the bacteria |
| Reason (R): | Bacteriophages usually have ds DNA |
| 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: Â Virus, Viroids & Prions |
 71%
From NCERT
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Given below are two statements:
| Assertion (A): | Mixotrophic nutrition is seen in Euglena |
| Reason (R): | Euglena is a photosynthetic as well as chemosynthetic autotroph |
| 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: Â Kingdom Protista: Euglenoids |
 62%
From NCERT
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Given below are two statements:
| Assertion (A): | Archaebacteria can survive in extreme conditions |
| Reason (R): | The cell wall of archaebacteria is identical in structure to that of bacteria |
| 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: Â Kingdom Monera: Bacterial Classification |
 81%
From NCERT
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Given below are two statements:
| Assertion (A): | Vegetative reproduction by fragmentation is common in basidiomycetes |
| Reason (R): | In club fungi, sexual spores are not formed during sexual reproduction |
| 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: Â Kingdom Fungi: Basidomycetes |
From NCERT
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