In an embryo sac, the cells that degenerate after fertilisation are:
1. Synergids and primary endosperm cell
2. Synergids and antipodals
3. Antipodals and primary endosperm cell
4. Egg and antipodals
1. Synergids and primary endosperm cell
2. Synergids and antipodals
3. Antipodals and primary endosperm cell
4. Egg and antipodals
While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would not be relevant?
1. Bagging of the female flower
2. Dusting of pollen on the stigma
3. Emasculation
4. Collection of pollen
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is:
| 1. | Cuticle | 2. | Sporopollenin |
| 3. | Lignin | 4. | Cellulose |
Consider the following two statements regarding the integuments of an ovule:
| I: | Angiosperms are generally bitegmic and gymnosperms unitegmic. |
| II: | The integuments develop into the seed coat when the ovule matures after fertilization. |
Of the two statements:
1. Both I and II are true
2. Both I and II are false
3. Only I is true
4. Only II is true
Cleistogamous flowers are:
| 1. | Mostly autogamous | 2. | Invariably autogamous |
| 3. | Mostly xenogamous | 4. | Invariably xenogamous |
The germ pore in the pollen wall:
| 1. | is an aperture in the pollen intine that allows the pollen tube to exit. |
| 2. | is the name of the nucleus of the microspore mother cell. |
| 3. | is formed where sporopollenin is located in the exine. |
| 4. | is an aperture in the pollen exine that allows the pollen tube to exit. |
Which of the following is not used by flowering plants as an outbreeding device?
| 1. | Lack of synchronization between pollen release and stigma receptivity. |
| 2. | Anther and Stigma placed at different levels. |
| 3. | Self-incompatibility. |
| 4. | Production of bisexual flowers. |
Filiform apparatus is associated with _____ and helps in _____________.
1. Syngergids; Nourishment of egg cells
2. Synergids; Guiding the pollen tube
3. Antipodals; Nourishment of egg cells
4. Antipodals; Guiding the pollen tube
Whether a pollen grain will be able to germinate on a stigma is primarily decided by:
| 1. | The stage at which the pollen is shed |
| 2. | Recognition by the stigma |
| 3. | Maturity of the egg cell in the embryosac |
| 4. | Environmental conditions |
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