Plant Reproduction Test

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Plant Reproduction Test - 5

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Weekly Quiz Competition

Question 1
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The female gametophyte in angiosperm is:

A
Ovule

B
Carpel

C
Embryo sac

D
Egg

Solution

The female gametophyte in angiosperms plants is calledEmbryo sac.
The female gametophyte of flowering plants, which produces the two female gametes –the egg cell and central cell –for double-fertilization by the two sperm cells of the male gametophyte (pollen grain).
Hence the correct option is 'C '
Question 2
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Sporopollenin an organic material is present in:

A
Exine

B
Intine

C
Style

D
Stigma
Solution
The exine of the pollen grain is made of sporopollenin. Sporopollenin is one of the most resistant organic compounds.
It can withstand high temperature, strong acids, and alkalis and cannot be degraded by any of the known enzymes.
Hence, it acts as a shield and protects the pollen grain from getting damaged.
Structure of pollen grain:
Hence the correct option is 'A '
Question 3
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What is the function of germ pore?

A
Absorption of water for seed germination.

B
Release of male gemetes.

C
Emergence of radicle.

D
Initiation of the pollen tube.
Solution
The germ pores are apertures in the exine layer of the pollen grain where the sporopollenin is absent.
The germ pore helps in theformation of the pollen tube and the release of the male gametes during fertilisation.
Thus, thecorrect answer is option ‘D ’ Initiation of pollen tube.
Question 4
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Male gametes in angiosperms are formed by the division of:

A
Vegetative cell

B
Microspore

C
Microspore mother cell

D
Generative cell
Solution
Male gametes in angiosperms are formed by the division ofgenerative cells.
A generative cell in flowering plants is defined as a precursor that divides into two sperm cells in the developing male gametophyte,the pollen.
Hence the correct option is D.
Question 5
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Starting from the innermost part, the correct sequence of parts in an ovule are:

A
Egg, integument, embryo sac and nucellus.

B
Egg, embryo sac, nucellus and integument.

C
Embryo sac, nucellus, integument and egg.

D
Egg, nucellus, embryo sac and integument.

Solution

Starting from the innermost part, the correct sequence of parts in an ovule isegg, Embryosac, nucellus, integument. This sequence can be seen in following

A diagrammatic view of an ovule
Question 6
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Filiform apparatus is a characteristic feature of:

A
Synergid

B
Egg

C
Suspensor

D
Zygote

Solution

A synergid cell wall forms a highly thickened structure called the filiform apparatus at the micropylar end consisting of numerous finger-like projections into synergid cytoplasm. These synergid cells are necessary for pollen tube guidance in the ovule.
Question 7
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Why is the bilobed nature of an anther distinct in a transverse section?

A
Because of the microsporangia

B
Because of the tapetum layer

C
Because of the epidermis

D
Because of the longitudinal groove

Solution

The bilobed nature of an anther is distinct in a transverse section due to the presence of microsporangia located at the corners of each lobe.
Question 8
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Directions: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion : The stigma serves as a landing platform for pollen grains.
Reason : The stigma is covered in fine hairs that help it trap pollen grains.

A
Both the assertion and reason are true, and the reason is a correct explanation of the assertion.

B
Both the assertion and reason are true, but the reason is not a correct explanation of the assertion.

C
The assertion is true, but the reason is false.

D
The assertion is false, but the reason is true.

Solution

The assertion correctly states that the stigma serves as a landing platform for pollen grains. The reason also correctly states that the stigma has fine hairs (which are part of the stigma 's structure) that aid in trapping pollen grains, providing a logical explanation for the assertion.
Question 9
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Assertion: In monosporic development, all four megaspores produced from the megaspore mother cell (MMC) do not contribute to the formation of the female gametophyte.
Reason: Monosporic development results in the formation of four functional megaspores.

A
Both the assertion and reason are true, and the reason is a correct explanation of the assertion.

B
Both the assertion and reason are true, but the reason is not a correct explanation of the assertion.

C
The assertion is true, but the reason is false.

D
The assertion is false, but the reason is true.

Solution

Explanation: In monosporic development, only one megaspore out of the four produced from the megaspore mother cell (MMC) develops into the female gametophyte. The other three megaspores typically degenerate. Therefore, the assertion is correct. However, the reason is incorrect as it states that all four megaspores become functional, which is not the case in monosporic development.
Question 10
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Match the terms on the Column I with their corresponding descriptions Column II:
Column I
A. Monocarpellary
B. Syncarpous
C. Micropyle
Column II
1. Refers to the condition where pistils are fused together.
2. Refers to the condition where gynoecium consists a single pistil.
3. The small opening in the ovule through which pollen tubes enter.

A
A - 1, B - 2, C - 3

B
A - 2, B - 3, C - 1

C
A - 3, B - 1, C - 2

D
A - 2, B - 1, C - 3

Solution

A. Monocarpellary:
- This term refers to the condition where the gynoecium (the female parts of a flower) consists of a single pistil.
- A pistil is a single orfused carpel , and the carpel is the individual unit of the gynoecium.
- Hence, option A (Monocarpellary ) matches with 2 (Refers to the condition where gynoecium consists a single pistil ).
B. Syncarpous:
- This term is used to describe the condition where multiple pistils are fused together.
- The pistils could be completely fused, or they could maintain separate ovaries but share a common style or stigma.
- Therefore, option B (Syncarpous ) matches with 1 (Refers to the condition where pistils are fused together ).
C. Micropyle:
- Micropyle is a small opening in the ovule of a seed plant.
- It 's through this opening that the pollen tube enters during fertilization.
- The micropyle allows for the sperm cells carried within the pollen tube to reach the ovule and fertilize it, leading to the formation of a seed.
- As a result, option C (Micropyle ) matches with 3 (The small opening in the ovule through which pollen tubes enter ).

So, the correct matching is: A - 2, B - 1, C - 3. Therefore, the answer is D.