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Q. No.Assertion(A): The main plant body of the bryophyte is haploid which possesses true roots, leaf-like and stem-like structures.
Reason(R): This main plant body produces gametes and it is known as gametophyte.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Subtopic: Bryophytes |
76%
Level 2: 60%+
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Assertion(A): Mosses are of great ecological importance.
Reason(R): Mosses are among the first organisms to colonize the rocks.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Reason(R): Mosses are among the first organisms to colonize the rocks.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Subtopic: Bryophytes |
76%
Level 2: 60%+
Hints
| Assertion(A): | Species of Sphagnum have good capacity to hold water. |
| Reason(R): | They have been used as packing material for trans-shipment of living material. |
Choices for Assertions and reasons:
| 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. | (A) is false, but (R) is true. |
Subtopic: Bryophytes |
Level 3: 35%-60%
Hints
Assertion(A): Double fertilization is an event unique to angiosperms.
Reason(R): There is an occurrence of two fusions i.e., syngamy and triple fusion.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Reason(R): There is an occurrence of two fusions i.e., syngamy and triple fusion.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Level 3: 35%-60%
Hints
| Assertion(A): | Earliest systems of classification separated the closely related species. |
| Reason(R): | Such systems were based on phylogenetic characters. |
| 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. | (A) is false, but (R) is true. |
Subtopic: Classification System |
78%
Level 2: 60%+
Hints
| Assertion(A): | Mosses reduce the impact of falling rain and prevent soil erosion. |
| Reason(R): | Lichens form a dense mat on the soil. |
| 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. | (A) is false, but (R) is true. |
Subtopic: Bryophytes |
57%
Level 3: 35%-60%
Hints
| Assertion(A): | Gymnosperms are called naked-seeded plants. |
| Reason(R): | The seeds remain exposed after their fertilization. |
| 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. | (A) is false, but (R) is true. |
Subtopic: Gymnosperms |
Level 4: Below 35%
Hints
Thallus level of organisation, rhizoids, dominant gametophyte and dependence on water to complete its life are the characteristics seen in:
| 1. | Pteridophytes | 2. | Gymnosperms |
| 3. | Angiosperms | 4. | Bryophytes |
Subtopic: Bryophytes |
89%
Level 1: 80%+
Please attempt this question first.
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Please attempt this question first.
What is the correct description of a prothallus?
| 1. | A structure in gymnosperms formed just after fertilisation |
| 2. | A sporophytic free living structure formed in pteridophytes |
| 3. | A gametophytic free living structure formed in pteridophytes |
| 4. | Sex organs bearing stage in Bryophytes |
Subtopic: Pteridophytes |
78%
Level 2: 60%+
Please attempt this question first.
Hints
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A ‘protonema’ stage in the life cycle of a moss is the:
| 1. | first stage in gametophyte generation |
| 2. | second stage in gametophyte generation |
| 3. | first stage in sporophyte generation |
| 4. | second stage in sporophyte generation |
Subtopic: Bryophytes |
69%
Level 2: 60%+
Please attempt this question first.
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