Unicellular and Multicellular MCQs
Unicellular and Multicellular – MCQs with Answers & Explanations
Class: CBSE Class 8
Subject: Science
Section: Cell – Structure and Functions
Topic: Unicellular and Multicellular MCQs
Board: CBSE Board Examination (Based on NCERT Syllabus)
Subject: Science
Section: Cell – Structure and Functions
Topic: Unicellular and Multicellular MCQs
Board: CBSE Board Examination (Based on NCERT Syllabus)
1. Organisms made up of a single cell are called:
Answer: B. Unicellular
Explanation: Unicellular organisms perform all life processes within one cell.
Explanation: Unicellular organisms perform all life processes within one cell.
2. Example of unicellular organism:
Answer: A. Amoeba
Explanation: Amoeba is a single‑celled organism performing all vital functions.
Explanation: Amoeba is a single‑celled organism performing all vital functions.
3. Multicellular organisms have:
Answer: C. Many cells
Explanation: They consist of numerous specialized cells.
Explanation: They consist of numerous specialized cells.
4. Which is multicellular?
Answer: C. Human
Explanation: Humans are made of trillions of cells.
Explanation: Humans are made of trillions of cells.
5. Cell specialization occurs in:
Answer: B. Multicellular
Explanation: Cells perform specific functions like nerve or muscle cells.
Explanation: Cells perform specific functions like nerve or muscle cells.
6. Tissue is a group of:
Answer: B. Cells
Explanation: Similar cells combine to form tissues.
Explanation: Similar cells combine to form tissues.
7. Smallest unicellular organism:
Answer: B. Bacteria
Explanation: Bacteria are microscopic unicellular organisms.
Explanation: Bacteria are microscopic unicellular organisms.
8. Movement in Amoeba occurs by:
Answer: C. Pseudopodia
Explanation: Temporary projections help Amoeba move and feed.
Explanation: Temporary projections help Amoeba move and feed.
9. Multicellular organisms show:
Answer: A. Division of labour
Explanation: Different cells perform different tasks.
Explanation: Different cells perform different tasks.
10. Paramecium moves using:
Answer: A. Cilia
Explanation: Hair‑like cilia help in locomotion.
Explanation: Hair‑like cilia help in locomotion.
11. Example of unicellular plant:
Answer: A. Chlamydomonas
Explanation: It is a single‑celled green alga.
Explanation: It is a single‑celled green alga.
12. Organization level absent in unicellular:
Answer: B. Tissue
Explanation: Single cells cannot form tissues.
Explanation: Single cells cannot form tissues.
13. Euglena has characteristics of:
Answer: C. Both plant & animal
Explanation: It photosynthesizes and also moves.
Explanation: It photosynthesizes and also moves.
14. Multicellular plants grow due to:
Answer: B. Cell division
Explanation: Growth occurs by increase in cell number.
Explanation: Growth occurs by increase in cell number.
15. Complexity is highest in:
Answer: C. Human
Explanation: Humans have highly organized systems.
Explanation: Humans have highly organized systems.
16. Yeast is:
Answer: B. Unicellular fungus
Explanation: Yeast performs respiration and reproduction in one cell.
Explanation: Yeast performs respiration and reproduction in one cell.
17. Organ level exists in:
Answer: B. Multicellular
Explanation: Organs are formed by tissues.
Explanation: Organs are formed by tissues.
18. Simplest level of organization:
Answer: C. Cell
Explanation: Cell is the basic structural unit.
Explanation: Cell is the basic structural unit.
19. Multicellular animals depend on:
Answer: B. Organ systems
Explanation: Systems coordinate body functions.
Explanation: Systems coordinate body functions.
20. Division of labour means:
Answer: B. Work shared by cells
Explanation: Specialized cells perform specific tasks efficiently.
Explanation: Specialized cells perform specific tasks efficiently.
