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Q. No.Cryopreservation is a technique that involves storing biological material in liquid nitrogen at:
1. 0°C
2. - 4°C
3. -100°C
4. -196°C
Subtopic: Stamen: Male Gametophyte |
97%
From NCERT
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A syncarpus gynoecium has:
1. a single pistil
2. no pistils
3. multiple free pistils
4. more than one fused pistils
1. a single pistil
2. no pistils
3. multiple free pistils
4. more than one fused pistils
Subtopic: Pistil: Ovule |
88%
From NCERT
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Gynoecium of Michelia is:
1. multicarpellary and apocarpous
2. multicarpellary and syncarpous
3. monocarpellary
4. sterile
1. multicarpellary and apocarpous
2. multicarpellary and syncarpous
3. monocarpellary
4. sterile
Subtopic: Pistil: Ovule |
81%
From NCERT
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A flower produces light and non-sticky pollens and has well exposed stamens. This flower is most likely pollinated by:
| 1. | Air | 2. | Water |
| 3. | Bees | 4. | Birds |
Subtopic: Pollination & Outbreeding Devices |
93%
From NCERT
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Regarding gynoecium in angiosperms:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | The basal bulged part of the pistil is the ovary. |
| II: | Inside the ovary is the ovarian cavity (locule). |
| III: | The placenta is located inside the ovarian cavity. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Pistil: Female Gametophyte |
90%
From NCERT
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In plant-animal pollinator mutualistic relationships:
| I: | Plants need the help of animals for pollinating their flowers and dispersing their seeds. |
| II: | Plants offer rewards or fees in the form of pollen and nectar for pollinators and juicy and nutritious fruits for seed dispersers. |
| 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: Pollination & Outbreeding Devices |
93%
From NCERT
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What is the chemical composition of the intine of the pollen grain?
1. Sporopollenin
2. Cellulose and pectin
3. Polysulphate esters
4. Alginates
1. Sporopollenin
2. Cellulose and pectin
3. Polysulphate esters
4. Alginates
Subtopic: Stamen: Male Gametophyte |
92%
From NCERT
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An endosperm cell of an angiosperm is found to have 30 chromosomes. What would be the chromosome number in the root cell of this angiosperm?
| 1. | 5 | 2. | 10 |
| 3. | 20 | 4. | 15 |
Subtopic: Double Fertilization | Endosperm |
75%
From NCERT
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Consider the given two statements:
| Assertion (A): | Development of apomictic embryos is considered significant in the context of hybrid seed production. |
| Reason (R): | If hybrids are made into apomicts, there is no segregation of characters in otherwise expensive to produce hybrid progeny. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is True |
Subtopic: Apomixis & Polyembryony |
89%
From NCERT
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Consider the given two statements:
| Assertion (A): | Majority of insect-pollinated flowers are large, colourful, fragrant and rich in nectar. |
| Reason (R): | Insects are attracted to flowers by colour, fragrance and/or nectar. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is True |
Subtopic: Pollination & Outbreeding Devices |
95%
From NCERT
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