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Q. No.In some organisms, karyokinesis is not followed by cytokinesis as a result of which multinucleate condition arises leading to the formation of syncytium. The perfect example for this is
1. appearance of a furrow in cell membrane.
2. liquid endosperm in coconut.
3. sexual reproduction.
4. fertilisation.
Subtopic: Endosperm |
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Level 1: 80%+
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Subtopic: Pollination & Outbreeding Devices |
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Subtopic: Stamen: Male Gametophyte |
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Subtopic: Pollination & Outbreeding Devices |
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Subtopic: Stamen: Male Gametophyte |
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The flowers pollinated by flies and beetles:
1. are large in size and always white in colour
2. secrete foul odours to attract these animals
3. produce winged pollens
4. are invariably pollinated by abiotic agents as well
1. are large in size and always white in colour
2. secrete foul odours to attract these animals
3. produce winged pollens
4. are invariably pollinated by abiotic agents as well
Subtopic: Pollination & Outbreeding Devices |
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Select the option that shows the correctly identified 'U', 'X','Y' and 'Z' in a developing dicot embryo
1. X-Plumule (2n), Y-Suspensor (n), Z-Cotyledon(2n), U-Radicle (2n)
2. X-Plumule (2n), Y Suspensor (2n), Z-Radicle(2n), U-Cotyledon (2n)
3. X-Suspensor(2n), Y-Cotyledon (n), Z-Radicle(2n), U-Plumule (2n)
4. X-Cotyledon (2n), Y-Radicle (n), Z-Plumule(n), U-Suspensor (n)
1. X-Plumule (2n), Y-Suspensor (n), Z-Cotyledon(2n), U-Radicle (2n)
2. X-Plumule (2n), Y Suspensor (2n), Z-Radicle(2n), U-Cotyledon (2n)
3. X-Suspensor(2n), Y-Cotyledon (n), Z-Radicle(2n), U-Plumule (2n)
4. X-Cotyledon (2n), Y-Radicle (n), Z-Plumule(n), U-Suspensor (n)
Subtopic: Double Fertilization |
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Enclosed within the integuments of a typical anatropous ovule is a diploid mass of cellular tissue Known as :
1. Megaspore mother cell
2. Nucellus
3. Synergids
4. Embryo sac
1. Megaspore mother cell
2. Nucellus
3. Synergids
4. Embryo sac
Subtopic: Pistil: Ovule |
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Researchers over the world are trying to transfer apomictic genes to hybrid varieties as hybrid characters in the progeny:
1. do not segregate
2. segregate
3. develop genetic variations
4. will remain unexpressed
1. do not segregate
2. segregate
3. develop genetic variations
4. will remain unexpressed
Subtopic: Apomixis & Polyembryony |
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The aquatic plant having long and ribbon like pollen grains is :
1. Vallisneria
2. Hydrilla
3. Eichhornia
4. Zostera
1. Vallisneria
2. Hydrilla
3. Eichhornia
4. Zostera
Subtopic: Pollination & Outbreeding Devices |
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