Pollen intine is made of:

1. Sporopollenin

2. Cellulose and pectin

3. Ergosterol

4. Phospholipids and cholesterol

Pollen grains lose their viability within 30 minutes of their release in:

1. Rose

2. Potato

3. Pea

4. Wheat

The intine of the pollen grain is a:

1. Thick and discontinuous layer made of sporopollenin

2. Thick and continuous layer made of sporopollenin

3. Thin and discontinuous layer made of cellulose and pectin

4. Thin and continuous layer made of cellulose and pectin

Pollen tablets are available in the market for

(1) In vitro fertilisation

(2) breeding programmes

(3) supplementing food

(4) Ex situ conservation

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

1. cuticle

2. sporopollenin

3. lignin

4. cellulose

Which one of the following is resistant to enzyme action?

(1) Cork

(2) Wood fibre

(3) Pollen exine

(4) Leaf cuticle

Male gametes in angiosperms are formed by the division of:

(1) microspore

(2) generative cell

(3) vegetative cell

(4) microspore mother cell

Male gametophyte in angiosperms produces 

1. two sperms and a vegetative cell

2. single sperm and a vegetative cell

3. single sperm and two vegetative cells

4. three sperms

Which one of the following statements is not true?

1. Pollen grains are rich in nutrients and they are used in the form of tablets and syrups

2. Pollen grains of some plants cause severe allergies and bronchial afflictions in some

people 

3. The flowers pollinated by flies and beetles secrete foul odour to attract them

4. Honey is made by bees by digesting pollen collected from flowers

Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of

(1) cutin

(2) suberin

(3) sporopollenin

(4) callose