Q. No.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
Long filamentous threads protruding at the end of a young cob of maize are:
| 1. | anthers | 2. | styles |
| 3. | ovaries | 4. | hairs |
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. |
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 |
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 |
In bananas, fruits can develop without fertilization. Such fruits are called as:
| 1. | Parthenogenetic | 2. | Parthenocarpic |
| 3. | True | 4. | False |
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. |
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 |
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 |
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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