Sexual Reproduction in Flowering Plants

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

1. Pollenkitt
2. Cellulosic intine
3. Oil content
4. Sporopollenin

Winged pollen grains are present in

1. Mustard
2. Cycas
3. Mango
4. Pinus

Double fertilization is

1. fusion of two male gametes of a pollen tube with two different eggs
2. fusion of one male gamete with two polar nuclei
3. fusion of two male gametes with one egg
4. syngamy and triple fusion

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

1. Hydrilla
2. Yucca
3. Banana
4. Viola

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

1. -120 C
2. -80 C
3. -196 C
4. -160 C

The morphological nature of the edible part of coconut is

1. cotyledon
2. endosperm
3. pericarp
4. perisperm

Functional megaspore in an angiosperm develops into an

1. endosperm
2. embryo sac
3. embryo
4. ovule.

Attractants and rewards are required for

1. entomophily
2. hydrophily
3. cleistogamy
4. anemophily.

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

1. bee
2. wind
3. bat
4. water

A dioecious flowering plant prevents both

1. autogamy and geitonogamy
2. geitonogamy and xenogamy
3. cleistogamy and xenogamy
4. autogamy and xenogamy.