Q. No.Even in absence of pollinating agents, seed setting is assured in:
1.
Commelina
2.
Zostera
3.
Salvia
4.
Fig
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Which one of the following statements is wrong?
| 1. | When pollen is shed at two-celled stage, double fertilization does not take place. |
| 2. | Vegetative cell is larger than generative cell. |
| 3. | Pollen grains in some plants remain viable for months. |
| 4. | Intine is made up of cellulose and pectin. |
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Plants with ovaries having only one or a few ovules, are generally pollinated by:
1. Bees
2. Butterflies
3. Birds
4. Wind
What is the function of germ pore?
1. Emergence of radicle
2. Absorption of water for seed germination
3. Initiation of pollen tube
4. Release of male gametes
Perisperm differs from endosperm in:
| 1. | having no reserved food. |
| 2. | being a diploid tissue. |
| 3. | its formation by fusion of a secondary nucleus with several sperms. |
| 4. | being a haploid tissue. |
Advantage of cleistogamy is :
1. More vigorous offspring
2. No dependence of pollinators
3. Vivipary
4. Higher genetic variability
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Which one of the following statements is correct?
1. Sporogenous tissue is haploid
2. Endothecium produces the microspores
3. Tapetum nourishes the developing pollen
4. Hard outer layer of pollen is called intine
Which one of the following statements is correct?
1. The seed in grasses is not endospermic.
2. Mango is a parthenocarpic fruit.
3. A proteinaceous aleurone layer is present in maize grain.
4. A sterile pistil is called a staminode.
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Geitonogamy involves
1. Fertilization of a flower by the pollen from another flower of the same plant
2. Fertilization of a flower by the pollen from same flower
3. Fertilization of a flower by the pollen from a flower of another plant in the same population
4. Fertilization of a flower by the pollen from a flower of another plant belonging to a distant population
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