- 1(current)
Q. No.The chief producers in the oceans are:
| 1. | Floating hydrophytes | 2. | Blue green algae |
| 3. | Desmids | 4. | Diatoms |
Subtopic: Kingdom Protista: Chrysophytes |
87%
From NCERT
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Chrysophytes:
| I. | include diatoms and desmids |
| II. | are found only in marine water |
| III. | are planktonic |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Kingdom Protista: Chrysophytes |
61%
From NCERT
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The cell walls of diatoms are ‘indestructible’ as they are embedded with:
| 1. | Silica | 2. | Chitin |
| 3. | Calcium | 4. | Raphides |
Subtopic: Kingdom Protista: Chrysophytes |
95%
From NCERT
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| Assertion (A): | Diatoms are the chief ‘producers’ in the oceans. |
| Reason (R): | Diatoms are one of the most abundant and diverse groups of photosynthetic phytoplankton in the oceans. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Kingdom Protista: Chrysophytes |
72%
From NCERT
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Identify the correct statements regarding diatoms:
1. Only I, II and III
2. Only I, II and IV
3. Only II, III and IV
4. I, II, III and IV
| I: | Diatoms are chief producers in the oceans |
| II: | Diatoms are microscopic and float passively in water |
| III: | The walls of diatoms are easily destructible |
| IV: | 'Diatomaceous earth' is formed by the cell walls of diatoms |
2. Only I, II and IV
3. Only II, III and IV
4. I, II, III and IV
Subtopic: Kingdom Protista: Chrysophytes |
84%
From NCERT
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Consider the given two statements:
| 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. | Both (A) and (R) are True and (R) explains (A) |
| 2. | Both (A) and (R) are True and (R) does not explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Kingdom Protista: Chrysophytes |
72%
From NCERT
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- 1(current)
Q. No.
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