Which one is surrounded by callose wall
1. Male gamete
2. Pollen grain
3. Egg
4. Microspore mother cell

Unisexuality of flowers prevents
1. Getionogamy but not xenogamy
2. Autogamy and geitonogamy
3. Autogamy but not geitonogamy
4. Both getionogamy and xenogamy

Flowers are unisexual in:
1. Cucumber
2. China rose
3. Onion
4. Pea

Megasporangium is equivalent to :
1. Fruit
2. Nucellus
3. Ovule
4. Embryo sac

Dioecy in flowering plants prevents:
1. autogamy but not geitonogamy
2. geitonogamy but not autogamy
3. both autogamy and geitonogamy
4. neither autogamy nor geitonogamy

What is the function of germ pores?
1. Absorption of water for seed germination
2. Initiation of pollen tube
3. Release of male gametes
4. The emergence of radicle

Which is the most common type of embryo sac in angiosperms?

1. Tetrasporic with one mitotic stage of division

2. Monosporic with three sequential mitotic divisions

3. Monosporic with two sequential mitotic divisions

4. Bisporic with two sequential mitotic divisions

Apomictic embryos in citrus arise from
1. Maternal sporophytic tissue in ovule
2. Antipodal cells
3. Diploid egg
4. Synergids

Plants with ovaries having only one or a few ovules, are generally pollinated by:
1. Bees
2. Butterflies
3. Birds
4. Wind