Sexual Reproduction in Flowering Plants Test

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Sexual Reproduction in Flowering Plants Test - 28

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Weekly Quiz Competition

Question 1
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Choose the correct statement from the following:

A
Cleistogamous flowers always exhibit autogamy

B
Chasmogamous flowers always exhibit geitonogamy

C
Cleistogamous flowers exhibit both autogamy and geitonogamy

D
Chasmogamous flowers never exhibit autogamy

Solution

Cleistogamous flowers (that do not open at all) always exhibit autogamy, whereas chasmogamous flowers (with exposed anthers and stigma) can exhibit autogamy, geitonogamy or xenogamy.
Question 2
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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:

A
Insects

B
Water

C
Wind

D
Animals

Solution

Light and non-sticky pollens are ideal to be blown away by wind. Feathery stamens are able to sway with the wind which helps in release of pollens into air.
Question 3
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From among the situations given below, choose the one that prevents both autogamy and geitonogamy.

A
Monoecious plant bearing unisexual flowers

B
Dioecious plant bearing only male or female flowers

C
Monoecious plant with bisexual flowers

D
Dioecious plant with bisexual flowers

Solution

Autogamy can happen in case of bisexual flowers, where the androecium and gynoecium mature at the same time. Geitonogamy can happen in case of monoecious plants, like cucurbits bearing both male and female flowers on the same plant.
Dioecious plants bear either male or female flowers, hence cannot undergo self pollination of any type. Example, Carica papaya.
So, the correct answer is 'Dioecious plant bearing only male or female' flowers.
Question 4
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In a fertilised embryo sac, the haploid, diploid and triploid structures are:

A
Synergid, zygote and primary endosperm nucleus

B
Synergid, antipodal and polar nuclei

C
Antipodal, synergid and primary endosperm nucleus

D
Synergid, polar nuclei and zygote.

Solution

Synergid, zygote and primary endosperm nucleus
Question 5
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In an embryo sac, the cells that degenerate after fertilisation are:

A
Synergids and primary endosperm cell

B
Synergids and antipodals

C
Antipodals and primary endosperm cell

D
Egg and antipodals.

Solution

PEN provides food for the growing embryo, while egg develops into embryo.
Question 6
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While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would not be relevant:

A
Bagging of female flower

B
Dusting of pollen on stigma

C
Emasculation

D
Collection of pollen

Solution

In case of dioecious plant, male and female flowers are not usually on a single plant. Hence, emasculation may not be necessary in certain cases.
Question 7
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In the embryos of a typical dicot and a grass, true homologous structures are:

A
Coleorhiza and coleoptile

B
Coleoptile and scutellum

C
Cotyledons and scutellum

D
Hypocotyl and radical.

Solution

In monocot, the cotyledon is called scutellum
Question 8
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The phenomenon observed in some plants wherein parts of the sexual apparatus is used for forming embryos without fertilisation is called:

A
Parthenocarpy

B
Apomixis

C
Vegetative propagation

D
Sexual reproduction

Solution

When seeds are produced without fertilization, this phenomenon is called apomixes. In parthenocarpy, seeds are not produced which means embryos are not produced.
Question 9
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In a flower, if the megaspore mother cell forms megaspores without undergoing meiosis and if one of the megaspores develops into an embryo sac, its nuclei would be:

A
Haploid

B
Diploid

C
A few haploid and a few diploid

D
With varying ploidy

Solution

Since no meiosis takes place so no change in ploidy will take place
Question 10
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The phenomenon wherein, the ovary develops into a fruit without fertilisation is called:

A
Parthenocarpy

B
Apomixis

C
Asexual reproduction

D
Sexual reproduction

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Sexual Reproduction in Flowering Plants Test - 28

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Sexual Reproduction in Flowering Plants Test - 28

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SHARING IS CARING

Question 1

Cleistogamous flowers always exhibit autogamy

Chasmogamous flowers always exhibit geitonogamy

Cleistogamous flowers exhibit both autogamy and geitonogamy

Chasmogamous flowers never exhibit autogamy

Solution

Question 2

Insects

Water

Wind

Animals

Solution

Question 3

Monoecious plant bearing unisexual flowers

Dioecious plant bearing only male or female flowers

Monoecious plant with bisexual flowers

Dioecious plant with bisexual flowers

Solution

Question 4

Synergid, zygote and primary endosperm nucleus

Synergid, antipodal and polar nuclei

Antipodal, synergid and primary endosperm nucleus

Synergid, polar nuclei and zygote.

Solution

Question 5

Synergids and primary endosperm cell

Synergids and antipodals

Antipodals and primary endosperm cell

Egg and antipodals.

Solution

Question 6

Bagging of female flower

Dusting of pollen on stigma

Emasculation

Collection of pollen

Solution

Question 7

Coleorhiza and coleoptile

Coleoptile and scutellum

Cotyledons and scutellum

Hypocotyl and radical.

Solution

Question 8

Parthenocarpy

Apomixis

Vegetative propagation

Sexual reproduction

Solution

Question 9

Haploid

Diploid

A few haploid and a few diploid

With varying ploidy

Solution

Question 10

Parthenocarpy

Apomixis

Asexual reproduction

Sexual reproduction

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