Sexual Reproduction in Flowering Plants Test

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Sexual Reproduction in Flowering Plants Test - 35

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Question 1
1 / -0

In the diagram, name the parts - A, B, C, D and E.

A
A - Germ pore, B - Generative cell, C- Intine, D - Exine, E - Vegetative cell

B
A- Germ pore, B - Generative cell, C- Exine, D - Entine, E - Vegetative cell

C
A- Intine, B- Exine, C - Germ pore, D - Generative cell, E - Vegetative cell

D
A- Exine, B- Intine, C- Vegetative cell, D - Germ pore, E - Generative cell

Solution

Pollen grains contain the male gametophyte produced by meiosis of microspore mother cells that are located along the inner edge of the microsporangia. The outer part of the pollen is exine, which is composed of a complex polysachharide, sporopollenin. Inner part is intine. The cell contains vegetative cell which develop into the pollen tube and germ pore and generative cell are also present.
Question 2
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Rarely among angiosperms the pollen grains influence the endosperm. This is called as

A
Metaxenia

B
Nemec phenomenon

C
Xenia

D
Mesogamy

Solution

The transfer of characters by a male gamete and its influence on endosperm is known as xenia.The term was coined in 1881 by the botanist Wilhelm Oibers Focke to refer to effects on maternal tissues, including the seed coat and pericarp, but at that time endosperm was also thought to be a maternal tissue, and the term became closely associated with endosperm effects.
So, the correct answer is option C.
Question 3
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Outer wall of pollen grain is made up of

A
Cellulose

B
Sporopollenin

C
Pectocellulose

D
Lignin

Solution

Sporopollenin is a major component of the tough outer walls of plant spores and pollen grains. It is chemically very stable.
So, the correct answer is 'Sporopollenin'
Question 4
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Apomixis in plant means development of new plant

A
From root cuttings

B
Without fusion of gametes

C
From fusion of gametes

D
From cuttings of stem

Solution

Apomixis in plant means development of new plant without fusion of gametes. Although seeds, in general, are the products of fertilization, a few flowering plants such as Asteraceae and grasses, have evolved this special mechanism. Apomixis is a form of asexual reproduction that mimics sexual reproduction. But, it does not involve meiosis and fertilisation.
So, the correct answer is 'Without fusion of gametes'
Question 5
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Which one of the following is resistant to enzyme action?

A
Pollen exine

B
Leaf cuticle

C
Cork

D
Wood fibre

Solution

Leaf cuticle, cork, wood fibre all are prone to enzyme action.
Pollen has a outer hard layer called exine. This exine is made up of sporopollenin protein which is one of the most resistant organic material known. No enzyme so far known can degrade exine. It is also resistant to high temperatures.
Question 6
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Sporopollenin is chemically:

A
Homopolysaccharide

B
Fatty substance

C
Protein

D
Heteropolysaccharide

Solution

Sporopollenin is a major component of the tough outer walls of plant spores and pollen grains. It is chemically very stable and is made of fats. It is a biopolymer of the fatty acid chain, phenolics, phenylpropanoid, carotenoid, and xanthophyll. It is found in the cell wall of the green algae. Phenylalanine is a major precursor for sporopollenin.
So, the correct answer is option B.
Question 7
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Which one of the following is odd?

A
Micropyle

B
Embryo sac

C
Nucellus

D
Pollen grain
Solution
- Micropyle is a small opening on the surface of an ovule.
- Embryo sac is the structure within a plant ovule that contains the egg cell.
- Nucellus is the central part of an ovule, containing the embryo sac.
- Pollen grain is a microscopic body that contains the male reproductive cell of a plant.
As all other structures are part of the ovule apart from the Pollen grain, therefore it is an odd one out. Hence, option D is correct.
Question 8
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Assured seed set is possible even in absence of pollinators, when pollination is

A
Chasmogamous

B
Cleistogamous

C
Geitonogamous

D
Xenogamous

Solution

Cleistogamy is the phenomenon of self-pollination that takes place in a closed flower. In this there is transfer of pollens from the anther to stigma of the same flower. Self- pollination results in preservation of pure lines. However, new variety of species will not be produced by this type of pollination.
So, the correct answer is option B.
Question 9
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Which of the following statement about sporopollenin is false?

A
Exine is made up of sporopollenin.

B
Sporopollenin is one of the resistant organic materials.

C
Exine has apertures called as germ pores where sporopollenin is present.

D
Sporopollenin can withstand high temperatures and strong acids.

E
No enzyme that degrades sporopollenin is so far known.

Solution

Sporopollenin is a major component of the tough outer walls called as exines in plant pores and pollen grains. They are not specified to germ pore alone, but is the chemical which forms the overall structural component.
Question 10
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In a pollen grain, larger nucleus is

A
Generative nucleus

B
Tube nucleus

C
Vegetative nucleus

D
None of the above

Solution

There are two nucleus in mature pollen grain, vegetative (the bigger one, responsible for pollen grain development) and generative (the smaller one, fuses with the egg).
Therefore, the correct answer is option C.

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Sexual Reproduction in Flowering Plants Test - 35

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Sexual Reproduction in Flowering Plants Test - 35

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Question 1

A - Germ pore, B - Generative cell, C- Intine, D - Exine, E - Vegetative cell

A- Germ pore, B - Generative cell, C- Exine, D - Entine, E - Vegetative cell

A- Intine, B- Exine, C - Germ pore, D - Generative cell, E - Vegetative cell

A- Exine, B- Intine, C- Vegetative cell, D - Germ pore, E - Generative cell

Solution

Question 2

Metaxenia

Nemec phenomenon

Xenia

Mesogamy

Solution

Question 3

Cellulose

Sporopollenin

Pectocellulose

Lignin

Solution

Question 4

From root cuttings

Without fusion of gametes

From fusion of gametes

From cuttings of stem

Solution

Question 5

Pollen exine

Leaf cuticle

Cork

Wood fibre

Solution

Question 6

Homopolysaccharide

Fatty substance

Protein

Heteropolysaccharide

Solution

Question 7

Micropyle

Embryo sac

Nucellus

Pollen grain

Solution

Question 8

Chasmogamous

Cleistogamous

Geitonogamous

Xenogamous

Solution

Question 9

Exine is made up of sporopollenin.

Sporopollenin is one of the resistant organic materials.

Exine has apertures called as germ pores where sporopollenin is present.

Sporopollenin can withstand high temperatures and strong acids.

No enzyme that degrades sporopollenin is so far known.

Solution

Question 10

Generative nucleus

Tube nucleus

Vegetative nucleus

None of the above

Solution

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