Endosperm is formed during double fertilization by:
1. Two polar nuclei & one male gamete
2. One polar nucleus & one male gamete
3. Ovum and male gamete
4. Two polar nuclei & two male gametes
Hair found in the inflorescences of Zea mays is the modification of:
1. | Style | 2. | Stigma |
3. | Spathe | 4. | Filaments |
In Angiosperms, pollen tubes liberate their male gametes into the:
1. Central cell
2. Antipodal cells
3. Egg cell
4. Synergids
What is the direction of the micropyle in the anatropous ovule:
1. | Upward | 2. | Downward |
3. | Right | 4. | Left |
In a flowering plant, archesporium gives rise to:
1. Only the wall of the sporangium
2. Both wall and the sporogenous cells
3. Wall and the tapetum
4. Only tapetum and sporogenous cells
Anemophilly type of pollination is found in:
1. Salvia
2. Bottlebrush
3. Vallisneria
4. Coconut
In grasses what happens in microspore mother cell for the formation of mature pollen grains:
1. One meiotic and two mitotic divisions
2. One meiotic & one mitotic division
3. One meiotic division
4. One mitotic division
Eight-nucleated embryosac is:
1. Only monosporic
2. Only bisporic
3. Only tetra sporic
4. Any of the above
Anthesis is a phenomenon that refers to:
1. formation of pollen
2. Development of anther
3. Opening of a flower bud
4. Reception of pollen by stigma
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which during pollination, brings genetically different types of pollen grains to stigma, is:
1. | Chasmogamy | 2. | Cleistogamy |
3. | Xenogamy | 4. | Geitonogamy |