Introduction
Short questions are an important part of Class 9 Biology examinations. They test a student’s understanding of basic concepts, definitions, and biological processes. This page provides carefully selected short questions and answers from the Class 9 Biology syllabus to help students revise effectively and improve their exam performance.
These questions cover major topics such as cell biology, enzymes, bioenergetics, nutrition, transport, and biodiversity.
Short Questions and Answers – Class 9 Biology
1. What is biology?
Biology is the branch of science that deals with the study of living organisms and their life processes.
2. Define biodiversity.
Biodiversity refers to the variety of living organisms found in a particular area, including plants, animals, and microorganisms.
3. What is a cell?
A cell is the basic structural and functional unit of life.
4. Name the main components of a cell.
The main components of a cell are the cell membrane, cytoplasm, and nucleus.
5. What is the function of the nucleus?
The nucleus controls cell activities and stores genetic material in the form of DNA.
6. What are tissues?
Tissues are groups of similar cells that work together to perform a specific function.
7. Define enzyme.
An enzyme is a biological catalyst that speeds up chemical reactions in living organisms.
8. Why are enzymes important?
Enzymes help carry out metabolic reactions efficiently at normal body temperatures.
9. What happens to enzymes at high temperature?
High temperature can denature enzymes, causing them to lose their shape and function.
10. What is bioenergetics?
Bioenergetics is the study of how living organisms obtain, use, and transform energy.
11. What is photosynthesis?
Photosynthesis is the process by which green plants use sunlight to make food from carbon dioxide and water.
12. What is respiration?
Respiration is the process by which cells release energy from food.
13. What is ATP?
ATP (adenosine triphosphate) is the main energy currency of the cell.
14. Define nutrition.
Nutrition is the process by which organisms obtain and utilize food for growth and energy.
15. What is a balanced diet?
A balanced diet contains all essential nutrients in proper amounts required for healthy growth and development.
16. What are autotrophs?
Autotrophs are organisms that prepare their own food, usually by photosynthesis.
17. What are heterotrophs?
Heterotrophs are organisms that depend on other organisms for food.
18. What is digestion?
Digestion is the process of breaking down complex food into simpler, soluble substances.
19. Define transport in plants.
Transport in plants is the movement of water, minerals, and food from one part of the plant to another.
20. What is transpiration?
Transpiration is the loss of water vapor from plant leaves through stomata.
21. What is the function of xylem?
Xylem transports water and minerals from roots to other parts of the plant.
22. What is the function of phloem?
Phloem transports prepared food from leaves to other parts of the plant.
23. What are microorganisms?
Microorganisms are very small living organisms that cannot be seen with the naked eye.
24. What is classification?
Classification is the process of grouping organisms based on their similarities and differences.
25. Why is biology important?
Biology helps us understand living organisms and improves fields such as medicine, agriculture, and environmental protection.
Conclusion
Practicing short questions regularly helps students strengthen their understanding of basic biological concepts. These Class 9 Biology short questions are useful for quick revision and exam preparation.
For more practice, explore chapter-wise MCQs and study guides available on MCQsArena.