Q. No.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 :
| 1. | Micropyle | 2. | Nucellus |
| 3. | Chalaza | 4. | Hilum |
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?
| 1. | Pollination occurs in submerged conditions by water. |
| 2. | Flowers emerge above the surface of water and pollination occurs by insects. |
| 3. | Flowers emerge above the water surface and pollen is carried by the wind. |
| 4. | Male flowers are carried by water currents to female flowers at the surface of the water. |
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 pores?
1. Absorption of water for seed germination
2. Initiation of pollen tube
3. Release of male gametes
4. The 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 a two-celled stage, double fertilization does not take place |
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