Class 10 Science Chapter 7: How do Organisms Reproduce?

Chapter 7 of the NCERT Class 10 Science textbook “Science”.

Chapter at a glance

This part introduces why organisms reproduce and the two main modes: asexual and sexual reproduction. You will learn simple definitions, how each mode works at a basic level, and where they appear in nature. The part highlights advantages and disadvantages of each mode and gives short examples. It sets the vocabulary used later in the chapter.

What you will learn: Definitions of reproduction, the difference between asexual and sexual reproduction, key terms (offspring, parent, gamete, fertilisation) and simple examples.

Why it matters: Knowing modes of reproduction helps you understand diversity, how traits pass on, and practical uses like making new plants by vegetative propagation.

Key concepts

Reproduction (one-line) — Reproduction is the biological process that makes new living individuals.
Asexual reproduction (one-line) — Asexual reproduction makes offspring from one parent without gametes.
Sexual reproduction (one-line) — Sexual reproduction combines genetic material from two parents using gametes.

What the chapter covers

Try at Home — A safe, simple activity to see growth and copying.
Why Questions — Short explanations of common 'why' points from the chapter.

Remember for the exam

Use correct terms and match examples to definitions.
Explain advantage/disadvantage with one reason.

Common mistakes

Mistake: Saying growth and reproduction are the same. Better: Explain that growth changes an existing individual, while reproduction produces a separate new individual.
Mistake: Claiming asexual offspring are always exactly identical to parents. Better: State that asexual offspring are very similar but not always perfect copies.
Mistake: Using the term 'egg' for all gametes without clarifying male/female. Better: Use correct terms: male gamete (sperm or pollen), female gamete (egg or ovule).

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