Primary endosperm nucleus (PEN) is formed by the fusion of

1. 2 polar nuclei + 1 synergid cell nucleus

2. 1 polar nucleus + 1 antipodal cell nucleus + 1 synergid cell nucleus

3. 2 polar nuclei + 1 male gamete nucleus

4. 2 antipodal cell nuclei + 1 male gamete nucleus

Subtopic:  Endosperm |
 87%
From NCERT
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Match column I with column II and select the correct option from the given codes.

      Column - I                 Column - II
A. Parthenocarpy (i) Seed formation without fertilization
B. Polyembryony (ii) More than one embryo in same seed
C.  Apomixis (iii)  Seedless fruits without fertilization
D. Somatic embryogenesis    (iv)   Embryo develops from a somatic cell

1. A - (iv), B - (ii), C - (iii), D - (i)

2. A - (iii), B - (ii), C - (i), D - (iv)

3. A - (i), B - (iv), C - (iii), D - (ii)

4. A - (ii), B - (iii), C - (i), D - (iv)

Subtopic:  Apomixis & Polyembryony | Fruit |
 88%
From NCERT
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The following is the diagram of T.S. of anther. Identify the parts labelled A, B and C.

1. A - Connective tissue, B - Pollen grains, C - Endothecium
2. A - Endothecium, B -Connective tissue, C - Pollen grains
3. A - Pollen grains, B - Connective tissue, C - Endothecium
4. A - Endothecium, B - Pollen grains, C - Connective tissue
Subtopic:  Stamen: Microsporangium |
 90%
From NCERT
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Select the option that contains all plants which produce non-endospermic seeds.

(1) Gram, Pea, Bean, Groundnut

(2) Castor, Peanut, Orchid, Wheat

(3) Coconut, Walnut, Wheat, Gram

(4) Castor, Maize, Coconu, Orchid

Subtopic:  Seed |
 85%
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Pollination in Rafflesia is occurred by

a.   carrion flies

b.   elephant

c.   bat

d.   crow

 

Subtopic:  Pollination & Outbreeding Devices |
AIIMS - 2015
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Censar mechanism of seed dispersal is found in

(1) Papaveraceae

(2) Liliaceae

(3) Leguminosae

(4) Rosaceae

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Which one of the most common embryo sac in flowering plant?

(1) Monosporic, 8 nucleated and 7 celled

(2) Monosporic, 7 celled and 7 nucleated

(3) Bisporic, 8 nucleated and 7 celled

(4) Bisporic, 7 celled and 8 nucleated

Subtopic:  Stamen: Male Gametophyte |
 89%
From NCERT
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When a fern plant is developed from its prothallus without fertilisation? This pehnomenon is an example of

(1) parthenocarpy

(2) apogamy

(3) apospory

(4) organogenesis

Subtopic:  Apomixis & Polyembryony |
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If a stock has 2n = 48 and scion microspore mother cell has 2n = 24; then root cell and the microspores will have .... chromosomes respectively.

(1) 12, 48

(2) 48, 12

(3) 24, 12

(4) 24, 96

Subtopic:  Stamen: Microsporangium | Stamen: Male Gametophyte |
 55%
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A fertilized egg of a plant has 40 chromosomes. The number of chromosomes present in the microspore mother cell is

(1) 20

(2) 40

(3) 60

(4) 80

Subtopic:  Stamen: Microsporangium |
 64%
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