Tag: asexual and sexual reproduction in plants

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Questions Related to asexual and sexual reproduction in plants

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

The female reproductive system produces haploid (n) gametes called ............. or egg cell.

  1. Ovum

  2. Endosperm

  3. Pollen grains

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

A. Female gametes are also called eggs or ovum. They are created during the cellular reproduction process known as meiosis. The resulting gamete cell is a haploid cell.

B. The endosperm is a tissue produced inside the seeds of most of the flowering plants following fertilization, It surrounds the embryo and provides nutrition.
C. pollen grains are the granular microspores that occur in pollen and give rise to male gametophyte of a seed plant and they are haploid.
D. The synergids are part of the egg apparatus and are thought to help the pollen nucleus reach the egg cell for fertilization.
So, the correct answer is "ovum".

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

Androphore is lightly differentiated in the flower of .................

  1. $Rafflesia$
  2. $Calycanthus$
  3. $Salvia$
  4. $Passiflora$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When in a flower, the internode between the corolla and the androecium is lengthened so as to raise the androecium high up in the air then that internode is called Androphore. It is an extension of the receptacle carrying the androecium and the gynoecium, typical of the caper family. In Passiflora, androphore is lightly differentiated.

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

When pollen tube enters through the base of a funiculus or the integument the phenomenon is known as

  1. Porogamy

  2. Chalazogamy

  3. Mesogamy

  4. Isogamy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When pollen tube enters through the micropyle, the phenomenon is known as porogamy. When pollen tube enters to the embryo sac through the tissue of the chalaza, the phenomenon is known as chalazogamy. When pollen tube enters through the base of a funiculus or the integument, the phenomenon is known as mesogamy. Isogamy is a form of sexual reproduction that involves fusion of gametes of similar size and structure. 

Thus, the correct answer is option C.

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

Ovule is comparable to ............

  1. Megasporangium

  2. Microsporangium

  3. Microsporophyll

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

Ovule means 'small egg'. In seed plants, the ovule is the surface that gives rise to and contains the female reproductive cells. It consists of three parts: the integuments form its outer layers, the nucellus and female gametophyte in its center. The female gametophyte specifically termed as megagametophyte is also called the embryo sac in angiosperms.

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

Nurse tissue of ovule is .............

  1. Nucellus

  2. Chalaza

  3. Hilum

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

The mature ovule contains in its central part a region called the nucellus that in turn contains an embryo sac with eight nuclei, each with one set of chromosomes. The two nuclei near the centre are referred to as polar nuclei. In the pines, the female gametophyte develops within the tissues of the nucellus and acquires abundant food reserves. The proembryo forms after a period of free-nuclear division in the zygote, and the tier of cells above the basal four then elongates to form a suspensor which pushes the embryonic group deep into the gametophyte.

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

Select the correct match.

   List I    List II
 A  Endothecium  1  Nutritive layer
 B  Tapetum  2  Single flower
 C  Tulip  3  Floral organs are borne
 D  Receptacle  4  Middle layer of anther

  1. A- 4, B- 1, C- 2, D- 3

  2. A- 1, B- 4, C- 3, D- 2

  3. A- 3, B- 4, C-2, D- 1

  4. A- 2, B- 3, C- 4, D- 1

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Endothecium is defined as the lining of the inner cavity of the anther. It is present as a middle layer. 

Tapetum is the nutritive layer present. It provides the function of providing nourishment for the growth. It gets extinct by the time pollen develops. 
Tulip is a flower, which belongs to the family of Liliaceae. 75 wild species are currently accepted. It is a single flower. T
he receptacle is the thickened part of a stem from which the flower organs grow. In some accessory fruits, like pome and strawberry, the receptacle gives rise to the edible part of the fruit.
So, the correct answer is option A.

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

What is the number of chromosomes in aleurone layer if 10 number of chromosomes are found in megaspore mother cell?

  1. 10

  2. 20

  3. 15

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If chromosomes of megaspore mother cell are 10; it ensures that the diploid number is 10. 2n = 10. Therefore, n = 5. Aleurone layer will be triploid in nature. Thus, the number of chromosomes in aleurone layer = 15.

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

The root cell of wheat plant has 42 chromosomes. What would be the number of chromosomes in the synergid cells?

  1. 7

  2. 14

  3. 21

  4. 28
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pollen tube ultimately enters an ovule through the micropyle and penetrates one of the sterile cells on either side of the egg ( synergids). These synergids begin to degenerate immediately after pollination. 
Synergids are haploid in nature. Thus, if root cell has 2n = 42, synergids will have n = 21.