From the statements given below choose the option that is true for a typical female gametophyte.

i. It is eight-nucleate and seven-celled at maturity.
ii. It is free-nuclear during the development.
iii. It is situated inside the integument, but outside the nucellus.
iv. It has an egg apparatus situated at the chalazal end.

1. (i) and (iv)             

2. (ii) and (iii)

3. (i) and (ii)                       

4. (ii) and (iv)

Subtopic:  Pistil: Female Gametophyte |
 83%
From NCERT
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Autogamy can occur in a chasmogamous flower if

1. pollen matures before maturity of ovule

2. ovules mature before maturity of pollen

3. both pollen and ovules mature simultaneously

4. both anther and stigma are of equal lengths

Subtopic:  Pollination & Outbreeding Devices |
 88%
From NCERT
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Choose the correct statement from the following : 
 
1. Cleistogamous flowers always exhibit autogamy
2. Chasmogamous flowers always exhibit geitonogamy 
3. Cleistogamous flowers exhibit both autogamy  geitonogamy 
4. Chasmogamous flowers never exhibit autogamy
Subtopic:  Pollination & Outbreeding Devices |
 87%
From NCERT
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Q. 12 A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by
1. insects     

2. water     

3. wind     

4. animals

Subtopic:  Pollination & Outbreeding Devices |
 93%
From NCERT
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Q.13 From among the situations given below, choose the one that prevents both autogamy and geitonogamy.

1. Monoecious plant bearing unisexual flowers.

2. Dioecious plant bearing only male or female flowers.

3. Monoeciousplant with bisexual flowers.

4. Dioecious plant with bisexual flowers.

Subtopic:  Pollination & Outbreeding Devices |
 79%
From NCERT
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Q.14 In a fertilised embryo sac, the haploid, diploid, and triploid structure are

(1) synergid, zygote and primary endosperm nucleus

(2) synergid, antipodal and polar nuclei

(3) antipodal, synergid and primary endosperm nucleus

(4) synergid, polar nuclei and zygote

Subtopic:  Pistil: Ovule |
 86%
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In an embryo sac, the cells that degenerate after fertilisation are

1. synergids and primary endosperm cell

2. synergids and antipodals

3. antipodals and primary endosperm cell

4. egg and antipodals

Subtopic:  Pistil: Female Gametophyte |
 88%
From NCERT
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While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps would not be relevant?

1. Bagging of female flower

2. Dusting of pollen on stigma

3. Emasculation

4. Collection of pollen

Subtopic:  Pollen - Pistil Interaction |
 69%
From NCERT
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In the embryos of a typical dicot and a grass, true homologous structures are

1. Coleorrhiza and coleoptile

2. Coleoptile and scutellum

3. Cotyledons and scutellum

4. Hypocotyle and radicle

Subtopic:  Embryo |
 63%
From NCERT
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The phenomenon observed in some plants wherein parts of the sexual apparatus is used for forming embryos without fertilization is called

1. parthenocarpy                   

2. apomixis

3. vegetative propagation     

4. sexual reproduction

Subtopic:  Apomixis & Polyembryony |
 68%
From NCERT
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