NCERT Solutions For Class 12 Biology Chapter 2: Sexual Reproduction in Flowering Plants

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NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants is included in this article. It comprises all the important definitions, concepts, and methodologies which will prove to be extremely beneficial for the students appearing for CBSE Class 12 Exam 2022-23. The important topics that are covered in Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants are:

Expected no. of Questions: 3-4 questions of around 4 marks.

Download PDF: NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants

NCERT Solutions for Class 12 Biology Chapter 2

NCERT Solutions PDF for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants are given below:

Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants: Important Topics

The organ of sexual reproduction is the flower. Male gametes are found in pollen grains and produced in the anthers of the flower. Female gametes are found in ovules and produced in the ovary of the flower. In plants, both sexual and asexual reproduction takes place.

Apomixis

Apomixis in flowering plants can be referred to as the asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization, and leading to embryo development.

Binary Fission

Binary Fission is a type of asexual reproduction wherein an organism divides into two, each part carrying one copy of genetic material. This process takes place with the division and duplication of the parent’s genetic matter into two parts

Double Fertilization

Double fertilization is a process in flowering plants, also known as angiosperms, by means of which they reproduce sexually.

Fertilization: The process, in general, involves the fusion of male and female gametes. In an angiosperm, double fertilization is said to be taking place. This simply means that two types of fertilization or fusion are occurring simultaneously where one female gamete fuses with two male gametes.

Flower Structure

The flower structure comprises four main parts or whorls—known as the calyx, corolla, androecium, and gynoecium. Flowering plants, also known as angiosperms, account for the vast majority of the plant kingdom.

Calyx: The calyx, part of a flower, is made up of sepals, green leaf-like structures that enclose the unopened bud.
Corolla: The corolla is composed of the petals of the flower, which are usually brightly colored in order to attract insects.
Androecium: The androecium is made up of the male reproductive organs, the stamens. Each stamen comprises a long, slender filament topped by a pollen-producing anther.
Gynoecium: The gynoecium lies in the very middle of the flower and is composed of a pistil or pistils (or carpels, as they are also sometimes called).

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CBSE CLASS XII Related Questions

1.
Why are restrictions imposed on MTP in India? Up to how many weeks or trimesters, is MTP considered relatively safe for a female, if necessary to perform, by a medical practitioner?

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2.
Student to attempt either option (A) or (B).
(A)
(i) Describe the process of megasporogenesis in an angiosperm.
(ii) Draw a diagram of a mature embryo sac of the angiosperm. Label its any four parts.
OR
(B) The reproductive cycle in the female primates is called menstrual cycle. The first menstruation begins at puberty.
Answer the following questions:
(i) Name the four phases of menstrual cycle in a proper sequence.
(ii) How long does the menstrual phase last in a menstrual cycle?
(iii) When and why hormones estrogen and progesterone reach their peak levels respectively, in the menstrual cycle?
(iv) Give the significance of LH surge.

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3.
If a natural population of 60 individuals is in Hardy-Weinberg equilibrium for a gene with two alleles B and b, with the gene frequency of allele B of 0.7, the genotype frequency of Bb will be:

( 0.21 )
( 0.42 )
( 0.49 )
( 0.56 )

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4.
Student to attempt either option-(A) or (B):
(A) Write the features a molecule should have to act as a genetic material. In the light of the above features, evaluate and justify the suitability of the molecule that is preferred as an ideal genetic material.
OR
(B) Differentiate between the following:
[(i)] Polygenic Inheritance and Pleiotropy
[(ii)] Dominance, Codominance and Incomplete dominance

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5.
Observe the given sequence of nitrogenous bases on a DNA fragment and answer the following questions:

(a) Name the restriction enzyme which can recognise the DNA sequence.
(b) Write the sequence after restriction enzyme cut the palindrome.
(c) Why are the ends generated after digestion called as ‘Sticky Ends’?

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6.
Flowering plants with hermaphrodite flowers have developed many reproductive strategies to ensure cross-pollination. Study the given outbreeding devices adopted by certain flowering plants and answer the questions that follow.

Note : All plants belong to the same species. No pollen tube growth/inhibition of pollen germination on stigma. Pollen germination on stigma.
[(a)] Name and define the outbreeding device described in the above table.
[(b)] Explain what would have been the disadvantage to the plant in the absence of the given strategy.

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NCERT Solutions For Class 12 Biology Chapter 2: Sexual Reproduction in Flowering Plants

NCERT Solutions for Class 12 Biology Chapter 2

Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants: Important Topics

Apomixis

Binary Fission

Double Fertilization

Flower Structure

CBSE CLASS XII Related Questions

1.
Why are restrictions imposed on MTP in India? Up to how many weeks or trimesters, is MTP considered relatively safe for a female, if necessary to perform, by a medical practitioner?

3.
If a natural population of 60 individuals is in Hardy-Weinberg equilibrium for a gene with two alleles B and b, with the gene frequency of allele B of 0.7, the genotype frequency of Bb will be:

Similar Biology Concepts

Comments

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NCERT Solutions For Class 12 Biology Chapter 2: Sexual Reproduction in Flowering Plants

NCERT Solutions for Class 12 Biology Chapter 2

Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants: Important Topics

Apomixis

Binary Fission

Double Fertilization

Flower Structure

CBSE CLASS XII Related Questions

1.Why are restrictions imposed on MTP in India? Up to how many weeks or trimesters, is MTP considered relatively safe for a female, if necessary to perform, by a medical practitioner?

3.If a natural population of 60 individuals is in Hardy-Weinberg equilibrium for a gene with two alleles B and b, with the gene frequency of allele B of 0.7, the genotype frequency of Bb will be:

Similar Biology Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Why are restrictions imposed on MTP in India? Up to how many weeks or trimesters, is MTP considered relatively safe for a female, if necessary to perform, by a medical practitioner?

3.
If a natural population of 60 individuals is in Hardy-Weinberg equilibrium for a gene with two alleles B and b, with the gene frequency of allele B of 0.7, the genotype frequency of Bb will be: