What type of pollination takes place in Vallisneria?

1.  Pollination occurs in submerged conditions by water.
2.  Flowers emerge above the surface of water and pollination occurs by insects.
3.  Flowers emerge above the water surface and pollen is carried by the wind.
4.  Male flowers are carried by water currents to female flowers at the surface of the water.

Subtopic:  Pollination & Outbreeding Devices |
 70%
From NCERT
NEET - 2019
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In which one of the following, both autogamy and geitonogamy are prevented?

1. Wheat

2. Papaya

3. Castor

4. Maize

Subtopic:  Pollination & Outbreeding Devices |
 85%
From NCERT
NEET - 2019
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Which is the most common type of embryo sac in angiosperms?

1. Tetrasporic with one mitotic stage of division

2. Monosporic with three sequential mitotic divisions

3. Monosporic with two sequential mitotic divisions

4. Bisporic with two sequential mitotic divisions

Subtopic:  Pistil: Female Gametophyte |
 73%
From NCERT
NEET - 2019
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Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

1. Ovules develop into an embryo sac

2. Ovary develops into fruit

3. Zygote develops into an embryo

4. Central cell develops into endosperm

Subtopic:  Pistil: Female Gametophyte |
 79%
From NCERT
NEET - 2019
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What is the fate of the male gametes discharged in the synergid?

1. One fuses with the egg and the other fuses with central cell nuclei
2. One fuses with the egg and the other(s) degenerate(s) in the synergid
3. All fuse with the egg
4. One fuses with the egg and the other(s) fuse(s) with a synergid nucleus

Subtopic:  Double Fertilization |
 87%
From NCERT
NEET - 2019
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In some plants, the female gamete develops into an embryo without fertilization. This phenomenon is known as:

1. Parthenogenesis 2. Autogamy
3. Parthenocarpy 4. Syngamy

Subtopic:  Fruit |
 64%
NEET - 2019
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Persistent nucellus in the seed is known as:

1. Tegmen 2. Chalaza
3. Perisperm 4. Hilum
Subtopic:  Seed |
 90%
From NCERT
NEET - 2019
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In a cereal grain, the single cotyledon of the embryo is represented by:

1. coleorhiza

2. scutellum

3. prophyll

4. coleoptiles

Subtopic:  Embryo |
 88%
From NCERT
AIPMT - 2006
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Which one of the following is resistant to enzyme action?

1. Cork
2. Wood fibre
3. Pollen exine
4. Leaf cuticle
Subtopic:  Stamen: Male Gametophyte |
 94%
From NCERT
AIPMT - 2008
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What does the filiform apparatus do at the entrance into the ovule?
1. it helps in the entry of pollen tube into the synergid
2. it prevents the entry of more than one pollen tube into the embryo sac
3. it brings about the opening of the pollen tube
4. it guides the pollen tube from the synergid to the egg

Subtopic:  Pistil: Female Gametophyte |
 54%
From NCERT
AIPMT - 2008
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