Q. No.Geitonogamy involves:
1.
Pollination of a flower by the pollen from another flower of the same plant.
2.
Pollination of a flower by the pollen from another same flower.
3.
Pollination of a flower by the pollen from a flower of another plant in the same population.
4.
Pollination of a flower by the pollen from a flower of another plant belonging to a distant population.
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Long filamentous threads protruding at the end of a young cob of maize are:
| 1. | anthers | 2. | styles |
| 3. | ovaries | 4. | hairs |
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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 |
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What is the fate of the male gametes discharged in the synergid?
| 1. | One fuses with the egg and the other fuses with central cell nuclei |
| 2. | One fuses with the egg and the other(s) degenerate(s) in the synergid |
| 3. | All fuse with the egg |
| 4. | One fuses with the egg and the other(s) fuse(s) with a synergid nucleus |
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When a plant grows from an embryo, the embryonic organ that persists for the entire life of the plant is:
| 1. | cotyledon | 2. | hypocotyl |
| 3. | suspensor | 4. | seed coat |
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In bananas, fruits can develop without fertilization. Such fruits are called as:
| 1. | Parthenogenetic | 2. | Parthenocarpic |
| 3. | True | 4. | False |
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Which of the following is incorrect regarding seeds in angiosperms?
| 1. | Mature seeds of peas and ground nuts are ex-albuminous. |
| 2. | Perisperm is seen in the mature seeds of black pepper and beet. |
| 3. | Dormant seeds have relatively higher moisture content than germinating seeds. |
| 4. | As ovules mature into seeds, the ovary develops into a fruit. |
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To encourage cross-pollination, all the following devices will be useful in an angiosperm except:
| 1. | Self-incompatibility |
| 2. | Asynchrony between pollen release and stigma receptivity |
| 3. | Cleistogamous flowers |
| 4. | Dioecy |
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Identify the incorrectly matched pair:
|
1. |
Cleistogamous flowers |
Invariable autogamous |
|
2. |
Geitonogamy |
Functionally cross-pollination |
|
3. |
Wind pollination |
Common in grasses |
|
4. |
Pollination by water |
Seen in all aquatic plants |
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Which of the following is incorrect regarding pollen grains in angiosperms?
| 1. | The exine is made up of sporopollenin. |
| 2. | Generative cell divides meiotically to give rise to four gametes. |
| 3. | In over 60% of angiosperms, pollen grains are shed at the 2-celled stage. |
| 4. | Pollen grains of many species can cause severe allergies in humans. |
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