NCERT Solutions For Class 12 Biology Chapter 1: Reproduction In Organisms

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NCERT Solutions for Class 12 Biology Chapter 1 Reproduction In Organisms is provided in this article. This chapter is under Unit VI- Reproduction, which is excluded from CBSE Class 12 Syllabus. The important topics that are covered in Class 12 Biology Chapter 1 are:

Download PDF: NCERT Solutions for Class 12 Biology Chapter 1 Reproduction in Organisms

NCERT Solutions for Class 12 Biology Chapter 1

NCERT Solutions PDF for Class 12 Biology Chapter 1 Reproduction in Organisms is provided below.

Class 12 Biology Chapter 1 Reproduction in Organisms: Important Topics

Reproduction in organisms is a biological process that helps animals to breed and continue the growth of the species. There are different ways of reproducing which can be either sexual or asexual. The article helps the students to understand both sexual and asexual reproduction, their processes, male and female reproductive organs systems, and disorders related. The important topics related to the chapter are as follows:

Reproduction

Reproduction is the production of offspring. There are different ways of reproduction in both sexual and asexual forms based on preference.

Sexual Reproduction: In this process, an organism combines the genetic information from each of its parents and is genetically unique. It occurs when the sperm from the male parent fertilizes an egg from the female parent, producing offspring.
Asexual Reproduction: On the contrary, one parent copies itself to form a genetically identical offspring in asexual reproduction. The offspring that inherits the full set of genes of their single parent arises by asexual reproduction from either unicellular or multicellular organisms.

Binary Fission

Binary fission is the asexual reproduction that takes place by a separation of the body into two new bodies. In this process, an organism duplicates its genetic material, or deoxyribonucleic acid (DNA), and then divides into two parts (cytokinesis), with each new organism receiving one copy of DNA.

Gemmule Formation

Gemmule formation generally takes place in freshwater by several sponges like Spongilia and some water species such as sea sponges, figuline ficus, and various other types of poriferans.

Vegetative Propagation in Plants

Vegetative propagation is an asexual process of plant reproduction that occurs in its leaves, roots and stem. The process can take place through fragmentation and regeneration of specific vegetative parts of plants.

Vegetative propagation in plants

Vegetative propagation in plants

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CBSE CLASS XII Related Questions

1.
Study the graphs given below for Case 1 and Case 2 showing different levels of certain hormones and answer the question that follows:
(a) Which hormone is responsible for the peak observed in Case 1 and Case 2? Write one function of that hormone.
(b) Write changes that take place in the ovary and uterus during follicular phase.
Student to attempt either sub-part (c) or (d):
(c) Name the hormone Q of Case 2. Write one function of hormone Q.
OR
(d) Which structure in the ovary will remain functional in Case 2? How is it formed?
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2.
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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3.
Compare and contrast convergent and divergent evolution.
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4.
Describe the structure and working of a sparged stirred-tank bioreactor.
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5.
Which one of the following options shows the correct evolutionary order of the plants mentioned below?
(i) Fern
(ii) Ginkgo
(iii) Zostrophyllum
(iv) Gnetales
- (iii), (ii), (i), (iv)
- (iii), (i), (ii), (iv)
- (ii), (i), (iii), (iv)
- (iv), (iii), (ii), (i)
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6.
(a) Indiscriminate human activities such as alien species invasion, fragmentation and habitat loss have accelerated the loss of biodiversity. Justify by taking one example for each.
(b) State the importance of the following:
(i) IUCN Red data list
(ii) Hot spots in conservation of biodiversity
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