Sexual Reproduction in Flowering Plants · Question 40

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.

Double fertilisation is exhibited by

1. algae
2. fungi
3. angiosperms
4. gymnosperms

The coconut water from tender coconut represents

1. free nuclear proembryo
2. free nuclear endosperm
3. endocarp
4. fleshy mesocarp.

Which one of the following statements is not true?

1. Pollen grains of many species cause severe allergies.
2. Stored pollen in liquid nitrogen can be used in the crop breeding programmes.
3. Tapetum helps in the dehiscence of anther.
4. Exine of pollen grains is made up of sporopollenin.

Seed formation without fertilisation in flowering plants involves the process of

1. somatic hybridisation
2. apomixis
3. sporulation
4. budding.