Double fertilization is exhibited by

• Gymnosperms

• Algae

• Fungi

• Fungi

Attractants and rewards are required for

• Anemophily

• Entomophily

• Hydrophily

• Hydrophily

A dioecious flowering plant prevents both:

• Autogamy and xenogamy

• Autogamy and geitonogamy

• Geitonogamy and xenogamy

• Geitonogamy and xenogamy

Coconut fruit is a

• Drupe

• Berry

• Nut

• Nut

Functional megaspore in an angiosperm develops into

• Ovule

• Endosperm

• Embryo sac

• Embryo sac

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

• Water

• Bee

• Wind

• Wind

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

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

• –120°C

• –80°C

• –160°C

• –196°C

Which of the following has proved helpful in preserving pollen as fossils?

• Pollenkitt

• Cellulosic intine

• Sporopollenin

• Oil content

180.

Offsets are produced by

• Meiotic divisions

• Mitotic divisions

• Parthenogenesis

• Parthenocarpy