In Angiosperms, pollen tubes liberate their male gametes into the:

1. Central cell

2. Antipodal cells

3. Egg cell

4. Synergids

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

Through which cell of the embryo sac, does the pollen tube enter the embryo sac:

1. Persistant synergid

2. Egg cell

3. Central cell

4. Degenerated synergid