Which one is surrounded by callose wall
1. Male gamete
2. Pollen grain
3. Egg
4. Microspore mother cell

Subtopic:  Stamen: Microsporangium | Stamen: Male Gametophyte |
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Unisexuality of flowers prevents
1. Getionogamy but not xenogamy
2. Autogamy and geitonogamy
3. Autogamy but not geitonogamy
4. Both getionogamy and xenogamy

Subtopic:  Pollination & Outbreeding Devices |
 58%
From NCERT
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Flowers are unisexual in:
1. Cucumber
2. China rose
3. Onion
4. Pea

Subtopic:  Post Pollination Events |
 66%
From NCERT
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Megasporangium is equivalent to :
1. Fruit
2. Nucellus
3. Ovule
4. Embryo sac

Subtopic:  Pistil: Ovule |
 68%
From NCERT
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Dioecy in flowering plants prevents:
1. autogamy but not geitonogamy
2. geitonogamy but not autogamy
3. both autogamy and geitonogamy
4. neither autogamy nor geitonogamy

Subtopic:  Pollination & Outbreeding Devices |
 70%
From NCERT
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What is the function of germ pores?
1. Absorption of water for seed germination
2. Initiation of pollen tube
3. Release of male gametes
4. The emergence of radicle

Subtopic:  Pollen - Pistil Interaction |
 70%
From NCERT
AIPMT - 2012

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To ensure that only the desired pollens fall on the stigma in artificial hybridization process :
(a) the female flower buds of plant producing unisexual flower need not be bagged.
(b) there is no need to emasculate unisexual flowers of selected female parent
(c) emasculated flowers are to be bagged immediately after cross pollination
(d) emasculated flowers are to be bagged after removal of anthers
(e) bisexual flowers, showing protogyny are never selected for cross

Choose the correct answer from the options given below :
1. (a), (b) and (c) only 2. (b), (c) and (d) only
3. (b), (c) and (e) only 4. (a), (d) and (e) only
Subtopic:  Pollination & Outbreeding Devices | Post Pollination Events |
 74%
From NCERT
NEET - 2022

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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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Apomictic embryos in citrus arise from
1. Maternal sporophytic tissue in ovule
2. Antipodal cells
3. Diploid egg
4. Synergids

Subtopic:  Apomixis & Polyembryony |
 73%
From NCERT
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Plants with ovaries having only one or a few ovules, are generally pollinated by:
1. Bees
2. Butterflies
3. Birds
4. Wind

Subtopic:  Pollination & Outbreeding Devices |
 74%
From NCERT
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