I: | Three cells grouped together at the micropylar end constituting the egg apparatus |
II: | Three cells are at the chalazal end and are called the antipodals |
1. | Only I is correct |
2. | Only II is correct |
3. | Both I and II are correct |
4. | Both I and II are incorrect |
Statement I: | Cleistogamous flowers are invariably autogamous. |
Statement II: | Chasmogamous flowers can never be autogamous. |
1. | Statement I is correct; Statement II is correct |
2. | Statement I is correct; Statement II is incorrect |
3. | Statement I is incorrect; Statement II is correct |
4. | Statement I is incorrect; Statement II is incorrect |
1. | from the first nuclear division |
2. | between the 2-nucleate and 4-nucleate stage |
3. | before the 8-nucleate stage |
4. | after the 8-nucleate stage |
The pollen intine is:
1. | a thin and continuous layer made up of cellulose and pectin. |
2. | a thick and discontinuous layer made up of cellulose and pectin. |
3. | made up of sporopollenin and is a continuous layer. |
4. | made up of sporopollenin and has prominent apertures called germ pores. |
I: | Endosperm development precedes embryo development. |
II: | The coconut water from tender coconut is cellular endosperm. |
III: | The white kernel in coconut is free nuclear endosperm. |
IV: | Endosperm is completely consumed by the developing embryo in pea. |
V: | Endosperm persists in the mature seed of castor. |
I: | In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. |
II: | In 40 per cent of angiosperms, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage). |