Unicellular vs Multicellular Organisms MCQs Quiz | Class 9
This practice quiz for Class IX Science (Code 086), Unit II: Organization in the Living World, focuses on Unicellular vs Multicellular Organisms. It covers the meaning, examples, and the concept of cell specialization (division of labour) to help students grasp the fundamental differences in biological organization. Submit your responses to view the score and download the PDF answer sheet.
Understanding Cell Number and Specialization
All living organisms are made of cells. Based on the number of cells constituting the body, organisms are classified into two main categories: Unicellular and Multicellular. This distinction is fundamental to understanding how life sustains itself, from the simplest microscopic entities to complex plants and animals.
1. Unicellular Organisms
These organisms are composed of a single cell. This single cell performs all the necessary life processes such as nutrition, respiration, excretion, growth, and reproduction. There is no division of labour because one cell does everything.
- Examples: Amoeba, Paramecium, Chlamydomonas, Bacteria.
- Characteristics: Generally microscopic, short lifespan, simple body organization.
2. Multicellular Organisms
These organisms are made up of many cells. The cells are grouped together to form tissues, organs, and organ systems. Each group of cells is specialized to perform a specific function. This is known as Division of Labour.
- Examples: Fungi, Plants (like Roses, Trees), Animals (like Humans, Insects).
- Characteristics: Macroscopic (visible to naked eye), longer lifespan, complex body organization, high efficiency due to specialization.
Comparison Table
| Feature | Unicellular | Multicellular |
|---|---|---|
| Cell Count | Single cell | Many cells |
| Function | One cell does all jobs | Specialized cells for specific jobs |
| Division of Labour | Absent (mostly) | Present (Cell Specialization) |
| Lifespan | Short | Relatively Long |
| Reproduction | Single cell divides | Specialized germ cells involved |
Extra Practice Questions
- Why is division of labour important in multicellular organisms?
It increases efficiency as specific cells focus on specific tasks, allowing the organism to perform complex functions simultaneously. - Can a unicellular organism be seen with the naked eye?
Most are microscopic, but some large unicellular organisms exist (like certain algae), though they are rare exceptions. - How does an Amoeba reproduce?
It reproduces through binary fission, where the single cell divides into two. - What is a tissue?
A group of similar cells that work together to perform a specific function in a multicellular organism. - Are all bacteria unicellular?
Yes, bacteria are single-celled prokaryotic organisms.
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