Regarding Marchantia:
I: | The thallus is dorsi-ventral and closely appressed to the substrate. |
II: | The plant is monoecious. |
1. | Both I and II are incorrect |
2. | Only I is incorrect |
3. | Only I is correct |
4. | Both I and II are correct |
1. Only I | 2. Only II |
3. Both I and II | 4. Neither I nor II |
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. |
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. |
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 |
1. | Red algae | 2. | Bryophytes |
3. | Pteridophytes | 4. | Gymnosperms |
1. Red algae | 2. Bryophytes |
3. Pteridophytes | 4. Gymnosperms |