Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by

• Water

• Bee

• Wind

• Wind

Functional megaspore in an angiosperm develops into

• Ovule

• Endosperm

• Embryo sac

• Embryo sac

Double fertilization is

• Fusion of two male gametes of a pollen tube with two different eggs

• Fusion of one male gamete with two polar nuclei

• Syngamy and triple fusion

• Fusion of two male gametes with one egg

Coconut fruit is a

• Drupe

• Berry

• Nut

• Nut

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

• –120°C

• –80°C

• –160°C

• –196°C