Sexual Reproduction in Flowering Plants Test

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Sexual Reproduction in Flowering Plants Test - 31

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Question 1
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Assertion : Photomodulation of flowering is phytochrome-regulated process.

Reason : Active form of phytochrome (Pfr) directly induces floral induction in shoot buds.

A
If both the assertion and reason are true and the reason is a correct explanation of the assertion

B
If both the assertion and reason are true but the reason is not a correct explanation of the assertion

C
If the assertion is true but the reaon is false

D
If both the assertion and reason are false

E
If the assertion is false but reason is true

Solution

Phytochrome is a receptor pigment present in leaves. They are responsible for flowering in plants. Phytochrome are two types $P_{r}$ (Red light) and $P_{fr}$ (far-red light) $P_{fr}$ are responsible for flowering of LDP.
Question 2
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The process of removal of anther from the flower bud before it dehisces is called as?

A
Emasculation

B
Bagging

C
Embryo rescue

D
Budding
Solution
- Emasculation is the process of removing anthers from bisexual flowers without affecting the female reproductive part (pistil).
- Emasculation is performed by plant breeders in bisexual flowers to obtain a desired variety of a plant by dusting the pollen grains from the required variety onto the stigma of the emasculated flower
- So, the correct answer is 'Emasculation'
Question 3
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In which one of the following, would you expect to find glyoxysomes?

A
Endosperm of wheat

B
Endosperm of castor

C
Palisade cells in leaf

D
Root hairs

Solution

Glyoxysomes are microbodies. These microbodies occur only in fat rich plant cells like castor seeds where they take part in $\beta$ -oxidation of fats and perform glyoxylate cycle. Glyoxysomes possess catalase enzyme.
Question 4
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Upon fertilization, what structure develops from carpel?

A
Testa

B
Tegmen

C
Pericarp

D
Perisperm

Solution

Ripened ovary or fertilized ovary is called fruit. The wall of the ovary forms fleshy or dry fruit wall known as pericarp. It means that the pericarp is developed from pistil or carpel.
Question 5
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Cleistogamy is leading over anthesis because;

A
Pollination agent is not required

B
It assures heterozygosity

C
It favours insect pollination

D
It allows xenogamy

Solution

Cleistogamous flowers do not open at all. In such flowers, the anthers and stigma lie close to each other. Anthers when dehisce in the flower buds, pollen grains come in contact with the stigma to effect pollination. Thus, cleistogamous flowers are autogamous as there is no chance of cross-polliation. So, no pollination agent is required in these flowers.
Question 6
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By tissue culture, indefinite number of plants from a small amount of parental tissue can be obtained. This technique is of great economic importance as ____________________________.

A
New species can be generated

B
Through somaclonal variation, a large number of variants can be isolated

C
It is a useful method to multiply genetically uniform population of elite species

D
Homozygous diploids can be obtained

Solution

Tissue culture technology is grounded on the fact that the entire plant can be regenerated from explants. This capacity to produce a whole plant from any cell/explant is named totipotency. Individually these plants will be genetically identical to the original plant. Several important food plants like tomato, apple, banana, etc., can be generated on the commercial scale by this method.

Thus, the correct option is C.
Question 7
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Select the options that contains all plants which produce non-endosprmic seeds.

A
Gram, pea, bean, groundnut

B
Castor, peanut, orchid, wheat

C
Coconut, walnut, wheat, gram

D
Castor, maize, coconut, orchid

Solution

Non-endospermic seeds or exalburninous seeds have no residual endosperm as it is completely consumed during embryo development. Gram, pea, bean and groundnut have non-endospermic seeds.
Question 8
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Exine of pollen is composed of ?

A
Pectocellulose

B
Lignocellulose

C
Sporopollenin

D
Pollenkitt

Solution

Sporopollenin is a major component of the tough outer walls called exine of pollen grains. It is chemically very stable and is usually well preserved in soils and sediments.
So, the correct answer is 'Sporopollenin'
Question 9
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Xenia is an effect of pollen grains on ......................

A
Embryo

B
Endosperm

C
Embryo sac

D
Nucellus

Solution

Xenia in plants is the effect of pollen grains on seeds and fruit. The term was coined in 1881 by botanist Wilhelm Olbers 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 'Endosperm'
Question 10
1 / -0

In plants, in nature, autogamy is avoided since the seeds produced

A
Are fewer in number

B
Do not germinate successfully

C
Do not produce healthy plants

D
All of the above

Solution

Autogamy is the phenomena of fusion of gametes produced from the same individual. It involves the transfer of pollen from the anther to the stigma of the same flower. It is avoided when the number of seed is less, or the produced pollen is not able to fuse and germinate with the ovule of the same flower or the produced pollen are not healthy. Autogamy is avoided by the plant to promote variation in the characters in the upcoming generation by cross pollination.
So, the correct answer is option D.

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Sexual Reproduction in Flowering Plants Test - 31

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Sexual Reproduction in Flowering Plants Test - 31

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Question 1

If both the assertion and reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reaon is false

If both the assertion and reason are false

If the assertion is false but reason is true

Solution

Question 2

Emasculation

Bagging

Embryo rescue

Budding

Solution

Question 3

Endosperm of wheat

Endosperm of castor

Palisade cells in leaf

Root hairs

Solution

Question 4

Testa

Tegmen

Pericarp

Perisperm

Solution

Question 5

Pollination agent is not required

It assures heterozygosity

It favours insect pollination

It allows xenogamy

Solution

Question 6

New species can be generated

Through somaclonal variation, a large number of variants can be isolated

It is a useful method to multiply genetically uniform population of elite species

Homozygous diploids can be obtained

Solution

Question 7

Gram, pea, bean, groundnut

Castor, peanut, orchid, wheat

Coconut, walnut, wheat, gram

Castor, maize, coconut, orchid

Solution

Question 8

Pectocellulose

Lignocellulose

Sporopollenin

Pollenkitt

Solution

Question 9

Embryo

Endosperm

Embryo sac

Nucellus

Solution

Question 10

Are fewer in number

Do not germinate successfully

Do not produce healthy plants

All of the above

Solution

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