NCERT Solutions for Class 12 Biology Chapter 2

Sexual Reproduction in Flowering Plants Class 12

Chapter 2 Sexual Reproduction in Flowering Plants Exercise Solutions

<< Previous Chapter 1 : Reproduction in Organisms Next Chapter 3 : Human Reproduction >>

Exercise : Solutions of Questions on Page Number : 40

Q1 :  

Name the parts of an angiosperm flower in which development of male and female gametophyte take place.


Answer :

The male gametophyte or the pollen grain develops inside the pollen chamber of the anther, whereas the female gametophyte (also known as the embryo sac) develops inside the nucellus of the ovule from the functional megaspore.

Answer needs Correction? Click Here

Q2 :  

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.


Answer :

(a)

Microsporogenesis

Megasporogenesis

1.

It is the process of the formation of microspore tetrads from a microspore mother cell through meiosis.

It is the process of the formation of the four megaspores from a megaspore mother cell in the region of the nucellus through meiosis

2.

It occurs inside the pollen sac of the anther.

It occurs inside the ovule.

(b) Both events (microsporogenesis and megasporogenesis) involve the process of meiosis or reduction division which results in the formation of haploid gametes from the microspore and megaspore mother cells.

(c) Microsporogenesis results in the formation of haploid microspores from a diploid microspore mother cell. On the other hand, megasporogenesis results in the formation of haploid megaspores from a diploid megaspore mother cell.

Answer needs Correction? Click Here

Q3 :  

Arrange the following terms in the correct developmental sequence:

Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q4 :  

With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q5 :  

What is meant by monosporic development of female gametophyte?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q6 :  

With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q7 :  

What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q8 :  

Mention two strategies evolved to prevent self-pollination in flowers.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q9 :  

What is self-incompatibility? Why does self-pollination not lead to seed formation in self-incompatible species?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q10 :  

What is bagging technique? How is it useful in a plant breeding programme?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q11 :  

What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q12 :  

Why do you think the zygote is dormant for sometime in a fertilized ovule?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q13 :  

Differentiate between:

(a) Hypocotyl and epicotyl;

(b) Coleoptile and coleorrhiza;

(c) Integument and testa;

(d) Perisperm and pericarp.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q14 :  

Why is apple called a false fruit? Which part(s) of the flower forms the fruit?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q15 :  

What is meant by emasculation? When and why does a plant breeder employ this technique?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q16 :  

If one can induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q17 :  

Explain the role of tapetum in the formation pollen-grain wall.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q18 :  

What is apomixis and what is its importance?


Answer :

Please Register/Login to get access to all solutions Facebook Login
<< Previous Chapter 1 : Reproduction in Organisms Next Chapter 3 : Human Reproduction >>

Biology : CBSE NCERT Exercise Solutions for Class 12th for Sexual Reproduction in Flowering Plants will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

Popular Articles