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Q. No.Study the Assertion statement followed by the Reason statement given below:
Assertion (A):
Diatoms have left behind large amount of cell wall deposits in their habitat.
Reason (R):
Diatoms are the chief ‘producers’ in the oceans.
1.
(A) is True; (R) is False.
2.
Both (A) and (R) are True and (R) correctly explains (A).
3.
Both (A) and (R) are True and (R) does not correctly explain (A).
4.
(A) is False; (R) is True.
Subtopic: Kingdom Protista: Chrysophytes |
68%
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 [Organism] |
COLUMN II [Cell wall] |
||
| A | Diatoms | P | Not present |
| B | Dinoflagellates | Q | Composed of peptidoglycan |
| C | Euglenoids | R | Cellulose plates on the outer surface |
| D | Eubacteria | S | Embedded with silica |
| A | B | C | D | |
| 1. | R | S | P | Q |
| 2. | S | R | P | Q |
| 3. | Q | R | P | S |
| 4. | S | R | Q | P |
Subtopic: Kingdom Protista: Chrysophytes | Kingdom Protista: Dinoflagellates | Kingdom Protista: Euglenoids |
82%
From NCERT
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The organism shown in the given figure:
| 1. | is amongst the chief producers in oceans. |
| 2. | is capable of heterotrophic nutrition when deprived of sunlight. |
| 3. | causes red tide that releases harmful toxins. |
| 4. | is an extremophile living in hydrothermal vents. |
Subtopic: Kingdom Protista: Dinoflagellates |
89%
From NCERT
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The phrase ‘Contagium vivum fluidum’ is associated with:
| 1. | M.W. Beijerinck | 2. | W.M. Stanley |
| 3. | Louis Pasteur | 4. | Dmitri Ivanowsky |
Subtopic: Virus, Viroids & Prions |
87%
From NCERT
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Viroid is an infectious agent that:
1. is larger than viruses.
2. was found to be a free DNA.
3. lacks the protein coat that is found in viruses.
4. has RNA of a very high molecular weight.
1. is larger than viruses.
2. was found to be a free DNA.
3. lacks the protein coat that is found in viruses.
4. has RNA of a very high molecular weight.
Subtopic: Virus, Viroids & Prions |
93%
From NCERT
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Regarding the bacteria shown in the given figure:
1. I is correct; II is incorrect
2. I is correct; II is correct
3. I is incorrect; II is incorrect
4. I is incorrect; II is correct
| I: | A is a bacillus and an example is a bacterium that adds cyanocobalamin to curd during fermentation. |
| II: | B is a coccus and an example of bacterium that was used by Griffith in his experiments. |
2. I is correct; II is correct
3. I is incorrect; II is incorrect
4. I is incorrect; II is correct
Subtopic: Kingdom Monera: Bacterial Classification |
89%
From NCERT
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Flagella are two in number and:
1. I is correct; II is incorrect
2. I is correct; II is correct
3. I is incorrect; II is incorrect
4. I is incorrect; II is correct
| I: | one lies longitudinally and the other transversely in a furrow between the wall plates in Euglenoids. |
| II: | one is shorter length and another longer in length in Dinoflagellates. |
2. I is correct; II is correct
3. I is incorrect; II is incorrect
4. I is incorrect; II is correct
Subtopic: Kingdom Protista: Dinoflagellates | Kingdom Protista: Euglenoids |
73%
From NCERT
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Viruses are no more "alive" than isolated chromosomes because: -
1. They require both RNA and DNA
2. They both need food molecules
3. They both require oxygen for respiration
4. Both require the environment of a cell to replicate
Subtopic: Virus, Viroids & Prions |
94%
From NCERT
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The vast majority of bacteria:
| 1. | are capable of fixing atmospheric nitrogen. |
| 2. | are photosynthetic autotrophs and have gas vacuoles. |
| 3. | do not have peptidoglycan in their cell walls. |
| 4. | depend on other organisms or on dead organic matter for food. |
Subtopic: Kingdom Monera: Bacterial Classification |
81%
From NCERT
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Amongst the given statements, the number of correct statements regarding viruses will be:
| I: | Viruses are inert outside their specific host cell. |
| II: | Viruses are obligate parasites. |
| III: | All viruses contain both RNA and DNA. |
| IV: | A virus is a nucleoprotein. |
| V: | Viruses are smaller than bacteria. |
| 1. | 2 | 2. | 3 |
| 3. | 4 | 4. | 5 |
Subtopic: Virus, Viroids & Prions |
82%
From NCERT
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