Sexual Reproduction in Flowering Plants

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.

In angiosperms pollen tubes liberate their male gametes into the

1. central cell
2. antipodal cells
3. egg cell
4. synergids

In angiosperms all the four microspores of tetrad are covered by a layer which is formed by

1. pectocellulose
2. callose
3. cellulose
4. sporopollenin

What is the direction of micropyle in anatropous ovule?

1. Upwards
2. Downward
3. Right
4. Left

Adventive embryony in Citrus is due to

1. nucellus
2. integuments
3. zygotic embryo
4. fertilized egg.

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 and one mitotic divisions
3. One meiotic division
4. One mitotic division

Anemophily type of pollination is found in

1. Salvia
2. bottle brush
3. Vallisneria
4. coconut.

Hair found in the inflorescence of Zea mays are the modification of

1. style
2. stigma
3. spathe
4. filaments.

Endosperm is formed during the double fertilization by

1. two polar nuclei and one male gamete
2. one polar nucleus and one male gamete
3. ovum and male gamete
4. two polar nuclei and two male gametes

Eight nucleated embryo sac is

1. only monosporic
2. only bisporic
3. only tetrasporic
4. any of these.