In water hyacinth and water lily, pollination takes place by:

1. Water currents only

2. Wind and water

3. Insects and water

4. Insects or wind

The body of the ovule is fused within the funicle at :

In some plants, the thalamus contributes to fruit formation. Such fruits are termed as:

1. False fruits

2. Aggregate fruits

3. True fruits

4. Parthenocarpic fruits

Which of the following is incorrect for wind-pollinated plants?

1. Well exposed stamens and stigma

2. Many ovules in each ovary

3. Flowers are small and not brightly colored

4. Pollen grains are light and non-sticky

In which one of the following, both autogamy and geitonogamy are prevented?

1. Wheat

2. Papaya

3. Castor

4. Maize

What type of pollination takes place in Vallisneria?

Which is the most common type of embryo sac in angiosperms?

1. Tetrasporic with one mitotic stage of division

2. Monosporic with three sequential mitotic divisions

3. Monosporic with two sequential mitotic divisions

4. Bisporic with two sequential mitotic divisions

Plants with ovaries having only one or a few ovules, are generally pollinated by : 

1.  Butterflies 

2.  Birds 

3. Wind 

4. Bees 

What is the function of germ pore ?
1.  Absorption of water for seed germination
2.  Initiation of pollen tube
3.  Release of male gametes
4.  Emergence of radicle

Which one of the following statements is wrong?
1.  Vegetative cell is larger than generative cell
2.  Pollen grains in some plants remain viable for months
3.  Intine is made up of cellulose and pectin
4.  When pollen is shed at two-celled stage, double fertilization does not take place