Tag: asexual and sexual reproduction in plants

Questions Related to asexual and sexual reproduction in plants

The part of the flower that contains ovules is

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Carpel

  2. Stamen

  3. Petal

  4. Sepal

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Correct Option: A
Explanation:

The carpel is one of the leaflike, seed-bearing structures that constitute the innermost whorl of a flower. The seeds of flowering plants are enclosed inside an ovary which contains ovule. The ovary is part of a flower's female reproductive structure called a carpel. A flower can have one or more carpels. If there are many carpels, they can be separate or fused together. Together, all the carpels are called a gynoecium, or a pistil.

So the correct option is 'carpel'.

What is the function of filiform apparatus in an angiospermic embryo sac?

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Brings about opening of the pollen tube

  2. Guides the pollen tube into a synergid

  3. Prevents entry of more than one pollen tube into a synergid

  4. None of these

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Correct Option: B
Explanation:

The synergid cell wall forming an extremely thick structure at the micropylar end is called the filiform apparatus. It bears several finger-like projections into the structure of synergid cytoplasm. The function of filiform apparatus is to guide entry of pollen tube and release of sperm cells. 

So, the correct option is 'Guides the pollen tube into a synergid'.

Micropyle occurs in 

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Seeds

  2. Ovule

  3. Ovary

  4. Stigma

Show answer
Correct Option: B
Explanation:

A small opening formed by inner/both/outer integument and enclosed by ovule integument/s is called as micropyle. It serves as entry point of pollen tube into ovule. Option B is correct. Seed is a small embryonic plant that develops from fertilised ovule. A typical seed has seed coat, endosperm and embryo. Option A is incorrect. The basal swollen part of pistil represents ovary. It has ovarian cavity with one/more locules and a parenchymatous cushion, i.e., placenta that bear ovule. Option C is incorrect. The terminal receptive part of pistil is termed as stigma that serves as landing platform for pollens during pollination. Option D is incorrect. 

Thus, the correct answer is option B.

Observe the example given in the box and find out how many of them possess single ovule in each ovary?


Papaya, water melon, wheat, paddy, orchids, and mango 

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Three

  2. Four

  3. Five

  4. Six

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Correct Option: A
Explanation:

paddy, mango and wheat possess single ovule in each ovary whereas papaya, watermelon and orchids contain many

A noncellular layer present on the outside of nucellus is
botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Integument

  2. Exine

  3. Endostomium

  4. Cuticle

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Correct Option: D
Explanation:
• The integument is the protective covering of ovule. Integuments may be one or two in number.
• The exine is the outer layer of pollen cell wall. It is chiefly composed of sporopollenin.
• Endostomium, also known as endostome, is the space between the inner Integument and Nucellus.
• Cuticle is a waxy covering which fills the space between the ovary wall and outer integument.
Thus, a non-cellular layer present on the outside of nucellus is Cuticle.
So, the correct answer is D.

A non-nutritive structure is

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Tapetum

  2. Endosperm

  3. Integument

  4. Palisade parenchyma

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Correct Option: C
Explanation:
• Tapetum is the innermost layer and completely surrounds the sporogenous tissue. The cells of tapetum have dense cytoplasm and generally more than one nuclei. It nourishes the developing pollen grains.
• Endosperm is the nutritive tissue that nourishes the developing embryo. It is formed from the fusion of male gamete with the diploid secondary nucleus resulting in the formation of a triploid primary endosperm mother cell which then develops into endosperm.
• Integuments are the protective coverings of the megasporangium. 
• Palisade parenchyma is present in the leaves and is the primary site of photosynthesis in plants. Thus, palisade parenchyma has nutritive function.
Hence, among all the options given in the question, integuments is the non-nutritive structure. So, the correct answer is C.

Meiosis is best observed in dividing.

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. Cells of apical meristem

  2. Cells of lateral meristem

  3. Microspores and anther wall

  4. Microsporocytes

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Correct Option: D

In tomato, meiosis occurs in

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. Pollen sac and ovule

  2. Microspore and megaspore mother cells

  3. Both A and B

  4. Zygote

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Correct Option: B

How many meiotic divisions are required to produce $1000$ pollen grains?

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. $200$

  2. $250$

  3. $500$

  4. $1000$

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Correct Option: B

Which one shows meiosis?

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. Root tip

  2. Archesporium

  3. Pollen grain

  4. Anther

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Correct Option: D