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Q. No.A persistent nutritive tissue of a seed derived from the nucellus and deposited external to the embryo sac —distinguished from endosperm is known as:
1. Tegmen
2. Chalaza
3. Perisperm
4. Hilum
Subtopic: Seed |
90%
From NCERT
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Identify the part labelled as 3 in the given diagram:
| 1. | Micropyle | 2. | Nucellus |
| 3. | Funiculus | 4. | Hilum |
Subtopic: Pistil: Ovule |
52%
From NCERT
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The only type of pollination which brings genetically different types of pollen grains to the stigma is:
1. Cleistogamy
2. Chasmogamy
3. Geitonogamy
4. Xenogamy
1. Cleistogamy
2. Chasmogamy
3. Geitonogamy
4. Xenogamy
Subtopic: Pollination & Outbreeding Devices |
91%
From NCERT
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In ‘double fertilization’ in angiosperms:
| I: | Syngamy results in the formation of zygote. |
| II: | Triple fusion results in the formation of the primary endosperm nucleus. |
| 1. | Only I is correct. |
| 2. | Only II is correct. |
| 3. | Both I and II are correct. |
| 4. | Both I and II are incorrect. |
Subtopic: Double Fertilization |
93%
From NCERT
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The female gametophyte in the angiosperms is:
| 1. | 7 celled and 8 nucleate |
| 2. | 8 celled and 7 nucleate |
| 3. | 7 celled and 7 nucleate |
| 4. | 8 celled and 8 nucleate |
Subtopic: Pistil: Female Gametophyte |
92%
From NCERT
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Identify the incorrect statement:
| 1. | Typical angiosperm anther is bilobed and dithecous. |
| 2. | Tapetum in the wall of the anther nourishes the developing pollen grains. |
| 3. | In over 60 % of angiosperms, pollen grains are shed at the three-celled stage. |
| 4. | Pollen exine is made up of sporopollenin. |
Subtopic: Stamen: Male Gametophyte |
92%
From NCERT
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The shield-like cotyledon in grass [monocot] seeds is called:
1. Plumule
2. Scutellum
3. Perisperm
4. Coleoptile
1. Plumule
2. Scutellum
3. Perisperm
4. Coleoptile
Subtopic: Seed |
91%
From NCERT
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Nucellar polyembryony is seen in:
1. Citrus and Mango
2. Castor and Pea
3. Grasses and Mustard
4. Orchids and China rose
Subtopic: Apomixis & Polyembryony |
82%
From NCERT
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In an angiosperm, the ovule is attached to the placenta by a stalk called:
1. Funicle
2. Raphe
3. Hilum
4. Chalaza
1. Funicle
2. Raphe
3. Hilum
4. Chalaza
Subtopic: Pistil: Ovule |
89%
From NCERT
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Wind-pollinated flowers are characterized by:
| 1. | being heavily scented |
| 2. | highly attractive colours |
| 3. | non-sticky light pollen grains, well-exposed stamen, large feathery stigma |
| 4. | ribbon shaped pollen with mucilaginous covering |
Subtopic: Pollination & Outbreeding Devices |
94%
From NCERT
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