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Q. No.In a cereal grain, the single cotyledon of the embryo is represented by:
1.
coleorhiza
2.
scutellum
3.
prophyll
4.
coleoptiles
Subtopic: Embryo |
88%
Level 1: 80%+
AIPMT - 2006
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Subtopic: Seed |
91%
Level 1: 80%+
NEET - 2019
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In some plants, the female gamete develops into an embryo without fertilization. This phenomenon is known as:
| 1. | Parthenogenesis | 2. | Autogamy |
| 3. | Parthenocarpy | 4. | Syngamy |
Subtopic: Seed |
61%
Level 2: 60%+
NEET - 2019
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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 |
Subtopic: Double Fertilization |
87%
Level 1: 80%+
NEET - 2019
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Select the incorrect statement:
| 1. | Inbreeding helps in the accumulation of superior genes and the elimination of undesirable genes |
| 2. | Inbreeding increases homozygosity |
| 3. | Inbreeding is essential to evolve pure lines in any animal |
| 4. | Inbreeding selects harmful recessive genes that reduce fertility and productivity |
Subtopic: Pollination & Outbreeding Devices |
65%
Level 2: 60%+
NEET - 2019
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Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?
| 1. | Ovules develop into an embryo sac |
| 2. | Ovary develops into fruit |
| 3. | Zygote develops into an embryo |
| 4. | Central cell develops into endosperm |
Subtopic: Pistil: Female Gametophyte |
80%
Level 1: 80%+
NEET - 2019
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Which one of the following is resistant to enzyme action?
1. Cork
2. Wood fibre
3. Pollen exine
4. Leaf cuticle
1. Cork
2. Wood fibre
3. Pollen exine
4. Leaf cuticle
Subtopic: Stamen: Male Gametophyte |
95%
Level 1: 80%+
AIPMT - 2008
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What does the filiform apparatus do at the entrance into the ovule?
| 1. | it helps in the entry of pollen tube into the synergid |
| 2. | it prevents the entry of more than one pollen tube into the embryo sac |
| 3. | it brings about the opening of the pollen tube |
| 4. | it guides the pollen tube from the synergid to the egg |
Subtopic: Pistil: Female Gametophyte |
56%
Level 3: 35%-60%
AIPMT - 2008
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Unisexuality of flowers prevents:
1. autogamy, but not geitonogamy
2. Both geitonogamy and xenogamy
3. geitonogamy, but not xenogamy
4. autogamy and geitonogamy
Subtopic: Pollination & Outbreeding Devices |
60%
Level 2: 60%+
AIPMT - 2008
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Wind pollinated flowers are:
| 1. | small, brightly coloured, producing large number of pollen grains |
| 2. | small, producing large number of dry pollen grains |
| 3. | large, producing abundant nectar and pollen |
| 4. | small, producing nectar and dry pollen |
Subtopic: Pollination & Outbreeding Devices |
80%
Level 1: 80%+
AIPMT - 2010
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