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. |
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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. |
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A | B | C | D | |
1. | Vascular plants | Seed plants | Green plants | Land plants |
2. | Land plants | Green plants | Seed plants | Vascular plants |
3. | Green plants | Land plants | Vascular plants | Seed plants |
4. | Seed plants | Vascular plants | Land plants | Green plants |
1. | Gymnosperm | 2. | Angiosperm |
3. | Bryophyte | 4. | Pteridophyte |
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The given figure represents:
1. | Equisetum, a horsetail where A is macrophyll and B is microphyll |
2. | Sphagnum, peat moss where A is microphyll and B is macrophyll |
3. | Equisetum, a horsetail where A is archegonial branch and B is antheridial branch |
4. | Sphagnum, peat moss where A is archegonial branch and B is antheridial branch |
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The given diagram shows :
1. An alga that lacks flagellated cells 2. A liverwort 3. A heterosporous pteridophyte 4. A gymnosperm with non motile sperms |
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Consider the following statements:
I: | Pteridophytes are the first terrestrial plants to possess vascular bundles. |
II: | Main plant body in pteridophytes is sporophyte which is differentiated into true stem and leaves. |
III: | Genera like Selaginella and Salvinia are heterosporous. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II and III |
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