1. autogamy, but not geitonogamy
2. Both geitonogamy and xenogamy
3. geitonogamy, but not xenogamy
4. autogamy and geitonogamy
1. | it helps in the entry of pollen tube into the synergid |
2. | it prevents the entry of more than one pollen tube into the embryo sac |
3. | it brings about the opening of the pollen tube |
4. | it guides the pollen tube from the synergid to the egg |
Male gametes in angiosperms are formed by the division of:
1. microspore
2. generative cell
3. vegetative cell
4. microspore mother cell
Which one of the following is surrounded by a callose wall?
1. Microspore mother cell
2. Male gamete
3. Egg
4. Pollen grain
What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in its synergids?
1. 16
2. 24
3. 32
4. 8
Long filamentous threads protruding at the end of a young cob of maize are:
1. | anthers | 2. | styles |
3. | ovaries | 4. | hairs |
The arrangement of the nuclei in a normal embryo sac in the dicot plants is:
1. 2+4+2
2. 3+2+3
3. 2+3+3
4. 3+3+2