Which of the following layers in the wall of an anther nourishes the developing pollen grains?

1. Tapetum

2. Epidermis

3. Endothecium

4. Middle layers

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 pistil of Papaver is:

1. Monocarpellary

2. Multicarpellary apocarpous

3. Multicarpellary syncarpous

4. Absent

How many of the nuclei in the female gametophyte in angiosperms are surrounded by cell wall?

(1) 5

(2) 6

(3) 7

(4) 8

The only type of pollination that brings genetically different types of pollen grains to the stigma is:

(1) Chasmogamy

(2) Cleistogamy

(3) Geitonogamy

(4) Xenogamy

Dioecy in plants prevents:

(1) Autogamy but not geitonogamy

(2) Geitonogamy but not autogamy

(3) Both autogamy and geitonogamy

(4) Neither autogamy nor geitonogamy

If the female parent produces unisexual flower:

(1) Emasculation must be done before maturity

(2) Emasculation must be done after maturity

(3) Emasculation must be done before pollination

(4) Emasculation is not needed

The central cell in the embryo sac, after triple fusion, becomes:

(1) Primary endosperm cell

(2) Endosperm

(3) Embryo

(4) Zygote

The endosperm is completely consumed by the developing embryo in all of the following except:

1. Pea

2. Groundnut

3. Beans

4. Castor