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
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which during pollination, brings genetically different types of pollen grains to stigma, is:
1. | Chasmogamy | 2. | Cleistogamy |
3. | Xenogamy | 4. | Geitonogamy |
In some members of which of the following pairs of families, pollen grains retain their viability for months after release?
1. Poaceae; Solanaceae
2. Rosaceae; Leguminosae
3. Poaceae; Rosaceae
4. Poaceae; Leguminosae
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 |
The plant parts which consist of two generations, one within the other, are:
a. | Pollen grains inside the anther |
b. | Germinated pollen grain with two male gametes |
c. | Seed inside the fruit |
d. | Embryo sac inside the ovule |
1. (a), (b), and (c)
2. (c) and (d)
3. (a) and (d)
4. (a) only
A typical angiospermic embryo sac is:
1. | 8 - nucleate, 8 - celled |
2. | 7 - nucleate, 8 - celled |
3. | 8 - nucleate, 7 - celled |
4. | 7 - nucleate, 6 - celled |
1. | Moths and butterflies are the most dominant pollinating agents among insects |
2. | Pollination by water is quite rare in flowering plants |
3. | Pollination by wind is more common amongst abiotic pollination |
4. | Flowers produce foul odours to attract flies and beetles to get pollinated |
Given below are two statements:
Statement I: | Cleistogamous flowers are invariably autogamous. |
Statement II: | Cleistogamy is disadvantageous as there is no chance for cross pollination. |
In the light of the above statements, choose the correct answer from the options given below:
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.