Zea mays have 20 chromosomes in its somatic cell. The number of chromosomes in its endosperm will be:
1. 10
2. 20
3. 30
4. 40

Subtopic:  Double Fertilization | Endosperm |
 77%
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The two innermost wall layers of microsporangium in an anther are:
1. Endothecium and tapetum
2. Epidermis and endodermis
3. Epidermis and middle layer
4. Middle layer and tapetum
Subtopic:  Stamen: Microsporangium |
 82%
From NCERT
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At maturity, the female gametophyte in angiosperms has:
I:  Three cells grouped together at the micropylar end constituting the egg apparatus
II:  Three cells are at the chalazal end and are called the antipodals
 
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:  Pistil: Ovule | Pistil: Female Gametophyte |
 88%
From NCERT
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Consider the two statements:
Statement I:  Cleistogamous flowers are invariably autogamous.
Statement II:  Chasmogamous flowers can never be autogamous.
 
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic:  Pollination & Outbreeding Devices |
 81%
From NCERT
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Cells of which of the following wall layer of microsporangium possess dense cytoplasm and generally have more than one nucleus?
1. epidermis
2. endothecium
3. middle layers
4. tapetum
Subtopic:  Stamen: Anther | Stamen: Microsporangium |
 90%
From NCERT
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During the formation of the embryo sac in angiosperms, cell walls are laid:
1. from the first nuclear division
2. between the 2-nucleate and 4-nucleate stage
3. before the 8-nucleate stage
4. after the 8-nucleate stage
Subtopic:  Pistil: Female Gametophyte |
 72%
From NCERT
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The pollen intine is:

1. a thin and continuous layer made up of cellulose and pectin.
2. a thick and discontinuous layer made up of cellulose and pectin.
3. made up of sporopollenin and is a continuous layer.
4. made up of sporopollenin and has prominent apertures called germ pores.
Subtopic:  Stamen: Anther | Stamen: Male Gametophyte |
 92%
From NCERT
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How many of the given statements are correct:
I: Endosperm development precedes embryo development.
II: The coconut water from tender coconut is cellular endosperm.
III: The white kernel in coconut is free nuclear endosperm.
IV: Endosperm is completely consumed by the developing embryo in pea.
V: Endosperm persists in the mature seed of castor.
1. 2
2. 3
3. 4
4. 5
Subtopic:  Endosperm |
 66%
From NCERT
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Study the given figure and select the correct statements:
   
I: In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage.
II: In 40 per cent of angiosperms, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage).
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic:  Stamen: Microsporangium | Stamen: Male Gametophyte |
 92%
From NCERT
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In the female gametophyte of angiosperms, filiform apparatus is a part of:
1. Synergids
2. Antipodals
3. Central cell
4. Egg
Subtopic:  Pistil: Ovule | Pistil: Female Gametophyte |
 94%
From NCERT
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