Q. No.Consider the given statements regarding Mosses:
I:
Protonema is a gametophyte stage that is creeping, green, branched and frequently filamentous.
II:
Leafy stage bears sex organs and is attached to the soil through multicellular and branched rhizoids.
III:
Sex organs are produced at the apex of the leafy shoot.
IV:
They have an elaborate mechanism of spore dispersal.
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
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Consider the given statements regarding certain pteridophytes:
Statement I: In Selaginella and Equisetum, sporophylls may form distinct compact structures called strobili or cones.
Statement II: Selaginella and Salvinia are heterosporous.
1. Statement I is correct but Statement II is incorrect
2. Statement I is incorrect but Statement II is correct
3. Statement I and Statement II are correct
4. Statement I and Statement II are incorrect
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Heterospory in some pteridophytes paved the way for the evolution of seeds in higher plants. |
| Reason (R): | The megaspores and microspores in heterosporous ferns give rise to female and male gametophytes respectively. |
In the light of the above statements choose the correct answer from the options given below:
| 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. |
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| Statement I: | In Cycas, the pinnate leaves persist for a few years. |
| Statement II: | In conifers, the needle-like leaves reduce the surface area helping to reduce water loss. |
2. Statement I is incorrect but Statement II is correct
3. Statement I and Statement II are correct
4. Statement I and Statement II are incorrect
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I. The dicots are characterized by seeds having two cotyledons, reticulate venation and trimerous flowers.
II. The monocots are characterized by single cotyledonous seed, parallel venation and tetramerous or pentamerous flowers.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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| I. | Sporophytic generation is represented only by the one-celled zygote. |
| II. | Meiosis in zygote results in the formation of haploid gametes. |
| III. | The dominant photosynthetic stage is the free living gametophyte |
| 1. | Only I is correct |
| 2. | Only I and III are correct |
| 3. | Only II is correct |
| 4. | I, II and III are correct |
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1. Gametophyte is the dominant photosynthetically independent phase.
2. The sporophytic stage is represented by the single to few-celled diploid sporophyte.
3. All seed bearing plants follow this pattern with some variations.
4. Most algae follow this type of life cycle.
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| 1. | Red algae | 2. | Bryophytes |
| 3. | Pteridophytes | 4. | Gymnosperms |
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I. Spirogyra is haplontic
II. Fucus is diplontic
III. Ectocarpus, Polysiphonia and kelps is haplo-diplontic
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
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| 1. Red algae | 2. Bryophytes |
| 3. Pteridophytes | 4. Gymnosperms |
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