What is the charasteristic of tapetum ?

(1) It does not store food.

(2) It is multi-nucleated.

(3) It is multi-layered structure.

(4) It nourishes the megaspore.

Subtopic:  Stamen: Anther |
 70%
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Cleistogamy is leadingover anthesis because

(1) pollination agent is not required

(2) it assures heterozygosity

(3) it favours insect pollination

(4) it allows xenogamy

Subtopic:  Pollination & Outbreeding Devices |
 86%
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Sporopollenin is a constituent of pollen exine.

It can be degraded by the action of 

(1) enzymes

(2) high temperature

(3) strong acids

(4) cannot be degraded

Subtopic:  Stamen: Male Gametophyte |
 91%
From NCERT
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The pollen grains of rice and wheat lose their viability in ___ minutes of their release.

(1) 30

(2) 10

(3) 60

(4) 90

Subtopic:  Stamen: Male Gametophyte |
 96%
From NCERT
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After double fertilizaton, a mature ovule has

(1) 1 diploid and 1 haploid cell

(2) 1 diploid and 1 triploid cell

(3) 2 haploid and 1 triploid cell

(4) 1 haploid and 1 triploid cell

Subtopic:  Double Fertilization |
 78%
From NCERT
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How many haploid nuclei are present in a mature pollen grain?

(1) One

(2) Two

(3) Three

(4) Four

Subtopic:  Double Fertilization |
 52%
From NCERT
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What is the correct sequence of the formation of female gametophyte in angiosperms?

(1) Nucellus, megapore tetrad, megaspore mother cell, megaspore, female gametophyte

(2) Megaspore tetrad, nucellus, megaspore mother cell, megaspore, female gametophyte

(3) Nucellus, megaspore mother cell, megaspore tetrad, megaspore, female gametophyte

(4) Megaspore mother cell, megaspore tetrad, megaspore, nucellus, female gametophyte

Subtopic:  Pistil: Female Gametophyte |
 60%
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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%
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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%
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