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.
Describe the series of experiments conducted by Frederick Griffith. Comment on the significance of the result obtained.
State the contribution of Avery, MacLeod and McCarty.
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2.
A DNA molecule is 160 base pairs long. It has 30% Guanine. How many Adenine bases are present in this DNA molecule?
- 48
- 64
- 96
- 192
View Solution
3.
Suggest how a virus-free healthy plant can be obtained from a diseased sugarcane plant.
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4.
Draw a labelled two-celled structure of male gametophyte of an angiosperm.
Name the three layers that surround the cytoplasm of a male gametophyte starting from innermost to outermost layer.
(iii) Which organic material makes the outermost layer? Mention its advantage.
(iv) Why is the outermost layer of male gametophyte not continuous ?
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5.
Work out the crosses between:
Normal female and Haemophilic male
Carrier female and Normal male
(III) Carrier female and Haemophilic male
Write the conclusions you draw from these crosses. Comment on the type of inheritance of the disease.
(Use: $X$ - Normal, $X^h$ - Haemophilic)
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6.
Read the following passage and answer the questions that follow:
India is one of the megadiverse countries housing around 8·1 per cent of global species diversity, although its land area is only 2·4 per cent of the world’s land area. Many of the species are highly threatened due to human activities like deforestation, mining and habitat fragmentation. Laws like Wildlife (Protection) Act, 1972 were enacted by the Government of India to preserve our biological wealth. Various conservation measures are being implemented to save the threatened species. The following bar graph shows the number of species conserved under different biodiversity conservation methods.

Which other methods shown in the diagram are opposite to the one identified by you in question ? How are these two conservation approaches different?
(c) Write two features of Biodiversity hotspots.
(c) To which category do sacred groves belong and how do they help in bio-conservation?