CBSE Class 7 Science Revision Notes Chapter 12

CBSE Class 7 Science Revision Notes Chapter 12 – Reproduction in Plants

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Chapter 12 Science Class 7 Notes cover all of the subtopics, in brief, making them ideal for reviewing the material prior to any examination. Students can access these Class 7 Science Notes Chapter 12 to improve their study habits, solidify fundamentals, and perform well on test day.

Revision Notes for CBSE Class 7 Science Chapter 12

Access Class 7 Science Chapter 12 – Reproduction in Plants Notes

Mode of Reproduction:

• Reproduction is the process by which a parent creates offspring.
• The process is biological.
• It is possible but not necessary for the offspring to resemble their parents exactly.
• The two types of reproduction are asexual reproduction and sexual reproduction.

Asexual Reproduction

• Asexual reproduction is defined as reproduction that takes place without the participation of male and female gametes.
• In this method of reproduction, the seed is not produced.

Sexual Reproduction

• The process of reproduction that uses both male and female gametes is known as sexual reproduction.
• In most plants, a male gamete is formed by pollen grains and a female gamete is produced by the ovary of the pistil. When they fuse, a zygote is formed.
• Ovary, stigma, and style make a pistil.
• In this mode of reproduction, a seed is produced.
• This reproduction takes place in the flower, which is the plant’s reproductive organ.
• Both male and female reproductive components, known as stamens and pistils, are present in flowers.
• Bisexual flowers are those that have both a pistil and a stamen, as opposed to unisexual flowers, which only have one of the two.

Pollination

• Pollination occurs when pollen is moved from a flower’s anther to its stigma.
• Self-pollination is the process by which a flower’s pollen adheres to its own stigma.
• Cross-pollination occurs when a flower’s pollen contacts the stigma of another flower.

Fertilisation

• Following pollination, there is fertilisation, in which male and female gametes combine to form a zygote, which then grows into an embryo.
• Following fertilisation, the ovary becomes the fruit and the ovules as seeds of the fruit.

Class 7 Science Chapter 12 Notes 

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NCERT Class 7 Science Chapter 12 Notes Revision

The details of the chapter Reproduction in Plants are covered in the Reproduction in Plants Chapter 12 Science Class 7 Notes.

There are two types of reproduction. Both asexual and sexual reproduction fall under this category.

Reproduction is the process through which organisms duplicate themselves.

Plants use asexual reproduction to reproduce. Without fusing the gametes, the organism creates a new organism in this instance. Asexual reproduction involves just one parent.

Fission

Asexual reproduction known as fission occurs in unicellular organisms like amoebas. In this instance, the parent cell will split into two or more daughter cells during binary fission. The single parent cell will split into numerous daughter cells during multiple fissions.

Fragmentation

This process of asexual reproduction, known as cloning, involves dividing the original organism into numerous copies. The fragments will then grow into mature, fully grown individuals that are clones of the original organism.

Budding

A type of asexual reproduction called budding occurs when cells divide at one specific parent organism site to create a new organism from an outgrowth or bud. Eventually, this separates from the parent cell.

Spore Formation

The phrase “spore formation” refers to spore-based reproduction. The microscopic spores serve as a reproductive body. When the spores are dispersed into the vicinity, if the conditions are favourable, they grow into plants. Among them are fungi.

A type of asexual reproduction known as vegetative propagation creates new plants from stems, roots, buds, and leaves.

Reproduction in Plants

Sexual Reproduction in Plants

Plants can reproduce sexually as well. It occurs when the gametes have fused. This eventually results in seeds, each of which develops into a new plant. A component of a plant that reproduces sexually is the flower. The pollen grains created by the anthers are the male gametes. The ovule that is created by the pistils contains the female gametes. During pollination, the male and female gametes come into contact. These come together during the fertilisation process, and as a result, a new plant is created through the production of fruit and seeds.

Pollination

The process of pollination involves moving the pollen grain from the male flower parts, called anthers, to the female flower part, called stigma.

Types of Pollination

Pollination can be of two types. Self-pollination occurs when the pollen touches the stigma of the same flower. Cross-pollination occurs when the stigma of one flower is touched by the pollen of another.