Tag: structure of male and female reproductive structures

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

Ovule in which funicle, chalaza and micropyle occur in one vertical plane is _________.

  1. Anatropous

  2. Orthotropous

  3. Amphitropous

  4. Campylotropous
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Those ovules in which the funicle, chalaza and micropyle lie in one straight line are called orthotropous ovules. Example, Urticaceae.

A. Anatropous ovules are those that have turned 180$^{o}$ and so the micropyle lies close to the hilum.
B. Orthotropous ovules are those that have funicle, chalaza and micropyle lie in one straight line.
C. Amphitropous ovules are curved and are horseshoe shaped.
D. Campylotropous ovules are curved such that micropyle and hilum do not lie in the straight line.
Hence, the correct answer is 'Orthotropous'.

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

Starting from the Innermost part, the correct sequence of parts in an ovule are.

  1. Egg, nucellus, embryo sac, integument

  2. Egg, embryo sac, nucellus, integument

  3. Embryo sac, nucellus, integument, egg

  4. Egg, integument, embryo sac, nucellus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Egg cell is inside the embryo sac in the ovule. The embryo sac is further enclosed by the parenchymatous tissue, nucellus, which provides nutrition to developing embryo. Nucellus is ultimately surrounded by integuments.

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

If spores have 10 chromosomes and 20 picogram DNA then what would be the chromosome number and DNA amount in spore mother cell at the end of S-phase in the life cycle of the same plant?

  1. 40 chromosomes and 80 pg DNA

  2. 20 chromosomes and 80 pg DNA

  3. 20 chromosomes and 40 pg DNA

  4. 40 chromosomes and 40 pg DNA
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Spores are haploid (n=10, DNA=20pg). The spore mother cell (SMC) is diploid (2n=20, DNA=40pg). During the S-phase, DNA replicates, doubling the DNA content to 80pg, while the chromosome number remains 20.

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

State whether the following statements are true or false.
Ovules are classified on the basis of the position of micropyle with respect to funicle.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In seed plants, the ovule ("small egg") is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: The integument(s) form its outer layer(s), the nucellus (or remnant of the megasporangium), and female gametophyte (formed from haploid megaspore) in its centre. Mature ovules i.e. megasporangia in angiosperms are mainly of five types. The principle of classification is based on the position of the micropyle, chalaza and hilum with regard to one another and also to the placenta.

So, the correct option is, 'true'.

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

Following meiosis in ovules, how many megaspores are formed?

  1. Two

  2. Four

  3. Six

  4. Eight
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ovule is the structure that gives rise to and contains the female reproductive cells. The megaspore is produced inside the nucleus of the ovule. During megasporogenesis, the megasporocyte or megaspore mother cell, undergoes meiosis to produce initially four haploid cells (the megaspores). After megasporogenesis, the megaspore develops into the female gametophyte (the embryo sac) in a process called megasporogenesis

So, the correct answer is 'four'

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

The part of the flower that contains ovules is

  1. Carpel

  2. Stamen

  3. Petal

  4. Sepal
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

Micropyle occurs in 

  1. Seeds

  2. Ovule

  3. Ovary

  4. Stigma
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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 

  1. Three

  2. Four

  3. Five

  4. Six
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

  1. Integument

  2. Exine

  3. Endostomium

  4. Cuticle
Reveal answer Fill a bubble to check yourself
D Correct answer
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.