Cell the Building Block of Life — Class 9 Science NCERT Solutions (Free)

Free step-by-step NCERT solutions for Class 9 Science chapter "Cell the Building Block of Life" — 8 important questions with detailed answers for CBSE board exam preparation.

TL;DR: Free step-by-step NCERT solutions for Class 9 Science chapter "Cell the Building Block of Life" — 8 important questions with detailed answers for CBSE…

By Syllab.in · Updated Jun 14, 2026

Key Questions Covered:

What is the cell?
Distinguish between prokaryotic and eukaryotic cells.
Name the three main parts of the cell.
What is the function of the plasma membrane?
What is the function of mitochondria?
Name two differences between plant and animal cells.
+ 2 more questions in the full chapter

Solutions Summary:

Question	Status
What is the cell?	✓ Solved
Distinguish between prokaryotic and eukaryotic cells.	✓ Solved
Name the three main parts of the cell.	✓ Solved
What is the function of the plasma membrane?	✓ Solved
What is the function of mitochondria?	✓ Solved
Name two differences between plant and animal cells.	✓ Solved

Showing 6 of 8 questions

Q1: What is the cell?

The cell is the fundamental unit of life. It is the smallest unit of living organisms that can carry out all life processes independently. All living organisms are made of one or more cells.

Q2: Distinguish between prokaryotic and eukaryotic cells.

Prokaryotic cells lack a membrane-bound nucleus and organelles (e.g., bacteria). Eukaryotic cells have a true membrane-bound nucleus and membrane-bound organelles (e.g., animal and plant cells). Prokaryotes are generally smaller than eukaryotes.

Q3: Name the three main parts of the cell.

1. Cell membrane (plasma membrane) - controls passage of materials 2. Cytoplasm - gel-like substance containing organelles 3. Nucleus - contains genetic material (DNA), controls cell activities

Q4: What is the function of the plasma membrane?

The plasma membrane is a semipermeable barrier that controls the passage of substances in and out of the cell. It allows useful materials to enter and prevents harmful substances from entering while removing waste products.

Q5: What is the function of mitochondria?

Mitochondria are the powerhouses of the cell. They generate energy (ATP) through cellular respiration, breaking down glucose and other nutrients to release energy that the cell uses for various activities.

Q6: Name two differences between plant and animal cells.

1. Plant cells have a cell wall (rigid) outside the membrane; animal cells do not. 2. Plant cells have large vacuoles for storage; animal cells have small vacuoles. 3. Plant cells have chloroplasts for photosynthesis; animal cells do not. 4. Plant cells are rectangular; animal cells are round.

Showing 6 of 8 questions. Visit the full page for complete solutions.