Chapter Exam

Chapter-18 Organisation of Life — Online MCQ Test

Q: What is the basic structural and functional unit of life?

Answer: B. Cell — A cell is the smallest unit that can perform all life processes. All living organisms are made up of one or more cells.

Q: Which part of the cell controls all the activities of the cell?

Answer: C. Nucleus — The nucleus acts as the control centre of the cell. It regulates cell activities and contains genetic material.

Q: Which of the following correctly arranges the levels of organization from smallest to largest?

Answer: B. Cell → Tissue → Organ → Organ system — Cells combine to form tissues, tissues form organs, and organs work together as organ systems. This is the correct order of organization.

Q: Which of the following is NOT a function of the cell membrane?

Answer: C. Produces food for the cell — The cell membrane protects the cell and regulates the passage of substances. Food is produced by chloroplasts in plant cells, not by the cell membrane.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-18 Organisation of Life with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: cell tissue organ Covers cell structure tissues and organ systems in living organisms. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-18 Organisation of Life — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-18 Organisation of Life, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the basic structural and functional unit of life?

A. Tissue
B. Cell ✓
C. Organ
D. System

Answer: B. Cell
A cell is the smallest unit that can perform all life processes. All living organisms are made up of one or more cells.

Which part of the cell controls all the activities of the cell?

A. Cell wall
B. Cytoplasm
C. Nucleus ✓
D. Vacuole

Answer: C. Nucleus
The nucleus acts as the control centre of the cell. It regulates cell activities and contains genetic material.

Which of the following correctly arranges the levels of organization from smallest to largest?

A. Organ → Tissue → Cell → Organ system
B. Cell → Tissue → Organ → Organ system ✓
C. Tissue → Cell → Organ → Organ system
D. Cell → Organ → Tissue → Organ system

Answer: B. Cell → Tissue → Organ → Organ system
Cells combine to form tissues, tissues form organs, and organs work together as organ systems. This is the correct order of organization.

Which of the following is NOT a function of the cell membrane?

A. Protects the cell
B. Controls movement of substances in and out
C. Produces food for the cell ✓
D. Encloses the cell contents

Answer: C. Produces food for the cell
The cell membrane protects the cell and regulates the passage of substances. Food is produced by chloroplasts in plant cells, not by the cell membrane.

Which of the following is the most appropriate reason why organs are formed from different tissues?

A. To make cells smaller
B. To allow a single function to be carried out more efficiently ✓
C. To reduce the number of cells in the body
D. To make all cells identical

Answer: B. To allow a single function to be carried out more efficiently
Different tissues in an organ perform different roles that together make the organ work efficiently. This division of labour is a key idea in organisation of life.

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