1. | To protect seeds | 2. | To attract insects |
3. | To trap pollen grains | 4. | To disperse pollen grains |
1. | Synergids, antipodals and Polar nuclei |
2. | Synergids, Primary endosperm nucleus and zygote |
3. | Antipodals, synergids, and primary endosperm nucleus |
4. | Synergids, Zygote and Primary endosperm nucleus |
1. | wind pollinated plants | 2. | insect pollinated plants |
3. | bird pollinated plants | 4. | bat pollinated plants |
1. | Geitonogamy | 2. | Xenogamy |
3. | Autogamy | 4. | Cleistogamy |
A. | 3 successive free nuclear divisions in functional megaspore. |
B. | Degeneration of 3 megaspores |
C. | Meiotic division in megaspore mother cell |
D. | Migration of 3 nuclei towards each pole. |
E. | Formation of a wall resulting in seven celled embryosac. |
1. | (A), (B), (C), (D), (E) | 2. | (C), (E), (A), (D), (B) |
3. | (B), (C), (A), (D), (E) | 4. | (C), (B), (A), (D), (E) |
1. | Polyembryony will be seen and each seed will produce many plantlets. |
2. | Seeds of hybrid plants will show longer dormancy. |
3. | Farmers can keep on using the seeds produced by the hybrids to raise new crop year after year. |
4. | There will be segregation of the desired characters only in the progeny. |
a: | the female flower buds of plant producing unisexual flower need not be bagged. |
b: | there is no need to emasculate unisexual flowers of selected female parent. |
c: | emasculated flowers are to be bagged immediately after cross pollination. |
d: | emasculated flowers are to be bagged after removal of anthers. |
e: | bisexual flowers, showing protogyny are never selected for cross. |
1. | One egg cell, two synergids, three antipodal cells, two Polar nuclei |
2. | One egg cell, two synergids, two antipodal cells, three Polar nuclei |
3. | One egg cell, three synergids, two antipodal cells, two Polar nuclei |
4. | One egg cell, two synergids, two antipodal cells, two Polar nuclei |