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Q. No.Assertion (A): Viruses are an exception to cell theory.
Reason (R): Viruses are noncellular in nature.
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: Virus, Viroids & Prions |
83%
From NCERT
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Assertion (A): In five kingdom system, Whittaker emphasized on reproductive characters of living beings.
Reason (R): Reproductive characters show less variations.
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.
Reason (R): Reproductive characters show less variations.
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: Different Classification Systems |
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Assertion (A): Archaebacteria are most resistant to adverse environmental conditions.
Reason (R): In archaebacteria, cell wall is highly resistant and complex.
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.
Reason (R): In archaebacteria, cell wall is highly resistant and complex.
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: Kingdom Monera: Bacterial Classification |
91%
From NCERT
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Chemosynthetic autotrophic bacteria play a great role in:
| 1. | forming blooms in polluted water bodies |
| 2. | recycling nutrients like nitrogen, phosphorous, iron and sulphur |
| 3. | making curd from milk |
| 4. | fixing nitrogen in legume roots |
Subtopic: Kingdom Monera: Introduction |
82%
From NCERT
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A dikaryophase of fungus is commonly seen in the sexual reproduction of:
I. Phycomycetes
II. Ascomycetes
III. Basidiomycetes
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
I. Phycomycetes
II. Ascomycetes
III. Basidiomycetes
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Kingdom Fungi: Introduction | Kingdom Fungi: Ascomycetes | Kingdom Fungi: Basidomycetes |
89%
From NCERT
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The infectious agent that causes potato spindle tuber disease is:
| 1. | a free RNA lacking a protein coat |
| 2. | a nucleocapsid |
| 3. | an abnormally folded protein |
| 4. | a ribozyme |
Subtopic: Virus, Viroids & Prions |
82%
From NCERT
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Bacteria are grouped under four categories based on their shape. Identify the incorrect match:
| 1. | Coccus | Spherical |
| 2. | Bacillus | Rod-shaped |
| 3. | Vibrium | Icosahedron |
| 4. | Spirillum | Spiral |
Subtopic: Kingdom Monera: Introduction |
94%
From NCERT
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Identify the correct statement regarding Euglenoids:
| 1. | Majority of them are marine water organisms found in running water. |
| 2. | The cell wall has stiff cellulose plates on the outer surface. |
| 3. | They have only one flagellum. |
| 4. | Though they are photosynthetic in the presence of sunlight, when deprived of sunlight they behave like heterotrophs. |
Subtopic: Kingdom Protista: Euglenoids |
88%
From NCERT
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What would be true for Alternaria but not for Puccinia?
| 1. | Heterotrophic mode of nutrition |
| 2. | Sexual stage is unknown |
| 3. | Lack of vegetative reproduction |
| 4. | Called as bracket fungi |
Subtopic: Kingdom Fungi: Deuteromycetes |
82%
From NCERT
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I [Protist] |
Column II [Feature of wall] |
||
| A | Diatoms | P | Cell wall has stiff cellulose plates on outer surface |
| B | Dinoflagellates | Q | Cell wall embedded with silica |
| C | Euglenoids | R | Protein rich layer instead of a cell wall |
| D | Slime moulds | S | True walls in spores |
| A | B | C | D | |
| 1. | Q | P | R | S |
| 2. | Q | P | S | R |
| 3. | P | Q | R | S |
| 4. | P | Q | S | R |
Subtopic: Kingdom Protista: Chrysophytes | Kingdom Protista: Dinoflagellates | Kingdom Protista: Euglenoids | Kingdom Protista: Slime Moulds |
88%
From NCERT
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