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)
Subtopic: Â Double Fertilization |
 85%
Level 1: 80%+
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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: Â Pistil: Ovule |
 80%
Level 1: 80%+
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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: Â Apomixis & Polyembryony |
Level 3: 35%-60%
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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: Â Pollination & Outbreeding Devices |
 61%
Level 2: 60%+
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In a typical dicotyledonous embryo, the portion of embryonal axis above the level of cotyledon is :
1. Plumule
2. Coleoptile
3. Epicotyl
4. Hypocotyl
1. Plumule
2. Coleoptile
3. Epicotyl
4. Hypocotyl
Subtopic: Â Embryo |
 73%
Level 2: 60%+
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To overcome incompatible pollination so as to get desired hybrids, a plant breeder must have the knowledge of ................ .
1. Pollen - nucellar interaction
2. Pollen - egg cell interaction
3. Pollen - pistil interaction
4. Pollen - embryo sac interaction
1. Pollen - nucellar interaction
2. Pollen - egg cell interaction
3. Pollen - pistil interaction
4. Pollen - embryo sac interaction
Subtopic: Â Pollen - Pistil Interaction |
 93%
Level 1: 80%+
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Pollen grains retain viability for months in plants belonging to different families given below :
(i) Solanaceae
(ii) Leguminosae
(iii) Gramineae
(iv) Rosaceae
(v) Liliaceae
The correct option is :
1. (i), (ii) and (v)
2. (i), (ii) and (iv)
3. (ii), (iv) and (v)
4. (i), (iii) and (v)
(i) Solanaceae
(ii) Leguminosae
(iii) Gramineae
(iv) Rosaceae
(v) Liliaceae
The correct option is :
1. (i), (ii) and (v)
2. (i), (ii) and (iv)
3. (ii), (iv) and (v)
4. (i), (iii) and (v)
Subtopic: Â Stamen: Male Gametophyte |
 86%
Level 1: 80%+
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In the transverse section of a young anther shown below, identify the correct sequence of wall layers from outside to inside:
| (i) | (ii) | (iii) | (iv) | |
| 1 | Middle layers | Endothecium | Epidermis | Tapetum |
| 2 | Tapetum | Middle layers | Endothecium | Epidermis |
| 3 | Epidermis | Endothecium | Middle layers | Tapetum |
| 4 | Endothecium | Middle layers | Tapetum | Epidermis |
Subtopic: Â Stamen: Anther |Â Stamen: Microsporangium |
 74%
Level 2: 60%+
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Floral reward's provided by insect pollinated flowers to sustain animal visit is/are :
1. Nectar and fragrance
2. Nectar and pollen grains
3. Pollen grains and fragrance
4. Fragrance and bright colour
1. Nectar and fragrance
2. Nectar and pollen grains
3. Pollen grains and fragrance
4. Fragrance and bright colour
Subtopic: Â Pollination & Outbreeding Devices |
 81%
Level 1: 80%+
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Which condition of gynoecium (pistil) is shown the figures (i) and (ii)?
| 1. | (i) | Multicarpellary apocarpous | (ii) | Multicarpellary syncarpous |
| 2. | (i) | multicarpellary syncarpous | (ii) | Multicarpellary apocarpous |
| 3. | (i) | Bicarpellary apocarpous | (ii) | Bicarpellary syncarpous |
| 4. | (i) | Bicarpellary syncarpous | (ii) | Bicarpellary apocarpous |
Subtopic: Â Pistil: Female Gametophyte |
 84%
Level 1: 80%+
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