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.
Explain the beneficial role of the following, produced as a result of the processes of biotechnology, to mankind:
(a) Cow named Rosie
(b) \(\alpha\)-1-antitrypsin

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2.
The following question is based on pollination. Study the figures carefully and answer the questions that follow.

Give the scientific terms for the processes taking place in Figures A and B respectively.
Mention two conditions necessary for the process occurring in Figure B.

[(i)] State one advantage and one disadvantage of the process occurring in Figure B.
OR
[(ii)] Name one plant where, in some flowers only, the process in Figure B takes place and give the reason responsible for it.

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3.
(a) A bilobed dithecous anther has 200 microspore mother cells per microsporangium. How many male gametophytes can be produced by this anther?
(b) Write the composition of intine and exine layers of a pollen grain.

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4.
Read the following passage and answer the questions that follow:
In nature, we rarely find isolated, single individuals of any species; majority of them live in groups in a well-defined geographical area, share or compete for similar resources, potentially interbreed and thus constitute a population. The population has certain attributes whereas, an individual organism does not. A population at a given time is composed of individuals of different ages. The size of the population tells us a lot about its status in the habitat. Whatever ecological processes we wish to investigate in a population, be it the outcome of competition with another species, the impact of the predator or the effect of pesticide application, we always evaluate in terms of any change in the population size. The size, in nature, could be low or go into millions. Population size, technically called population density (N) need not necessarily be measured in numbers only. The size of a population for any species is not a static parameter. It keeps on changing with time depending on various factors including food availability, predation pressure and adverse weather. (a) The Monarch butterfly is highly distasteful to its predator because of a special chemical present in its body. How does the butterfly acquire this chemical?
(b) If population density at a time t + 1 is 800, Emigration = 100, Immigration = 200, Natality = 200 and Mortality = 150, calculate the population density at time t and comment upon the type of age pyramid that will be formed in this case.
Student to attempt either sub-part (c) or (d):
(c) What is the difference in a method of measuring population density in an area if there are 200 carrot grass plants to only single huge banyan tree?
\begin{center} OR \end{center} (d) Name two methods to measure the population density of tigers.

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5.
1. Perform a cross between two sickle cell carriers. What ratio is obtained between carrier, disease free and diseased individuals in F1 progeny? Name the nitrogenous base substituted, in the haemoglobin molecule in this disease.
2. Explain the difference in inheritance pattern of flower colour in garden pea plant and snap-dragon plant with the help of monohybrid crosses.
OR,
Explain with the help of well-labelled diagrams how lac operon operates in E. coli :
1. In presence of an inducer.
2. In absence of an inducer.

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6.
Given below are the diagrammatic representations of the replicating fork of DNA in E. coli. Study the diagrams and answer the questions that follow.

(a) Which one of the three diagrams (i), (ii) or (iii) is the correct representation of the replicating fork of DNA replication? Explain your answer.
(b) Name the enzyme used in E. coli to join the newly synthesised fragments of DNA.

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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.
Explain the beneficial role of the following, produced as a result of the processes of biotechnology, to mankind:
(a) Cow named Rosie
(b) \(\alpha\)-1-antitrypsin

3.
(a) A bilobed dithecous anther has 200 microspore mother cells per microsporangium. How many male gametophytes can be produced by this anther?
(b) Write the composition of intine and exine layers of a pollen grain.

Similar Biology Concepts

Comments

dOGVmW

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.Explain the beneficial role of the following, produced as a result of the processes of biotechnology, to mankind: (a) Cow named Rosie (b) \(\alpha\)-1-antitrypsin

3.(a) A bilobed dithecous anther has 200 microspore mother cells per microsporangium. How many male gametophytes can be produced by this anther? (b) Write the composition of intine and exine layers of a pollen grain.

Similar Biology Concepts

Comments

dOGVmW

1.
Explain the beneficial role of the following, produced as a result of the processes of biotechnology, to mankind:
(a) Cow named Rosie
(b) \(\alpha\)-1-antitrypsin

3.
(a) A bilobed dithecous anther has 200 microspore mother cells per microsporangium. How many male gametophytes can be produced by this anther?
(b) Write the composition of intine and exine layers of a pollen grain.