This chapter gives an overview of what biology is and why it’s important. This post includes Class 9 Biology Chapter 1 MCQs to help students review the main topics in an easy and effective way. These topics include the definition of biology, its branches, levels of organization, everyday applications, the scientific method, and early scientists who contributed to the field.
1. What is the main objective of biology as a science?
- A. To study rocks and minerals
- B. To understand the structure and functions of living organisms ✅
- C. To classify non-living things
- D. To explore planetary movements
Explanation: Biology focuses on the study of living beings, their structure, functions, and interactions.
2. Which branch of biology studies tissues?
- A. Anatomy
- B. Histology ✅
- C. Genetics
- D. Taxonomy
Explanation: Histology is the study of tissues in plants and animals, typically under a microscope.
3. Which level of biological organization comes just after cells?
- A. Organs
- B. Organisms
- C. Tissues ✅
- D. Systems
Explanation: Similar cells form tissues, which then combine to form organs.
4. The part of earth where life exists is called:
- A. Ecosystem
- B. Biosphere ✅
- C. Lithosphere
- D. Community
Explanation: Biosphere refers to all regions of Earth that support life, including land, water, and atmosphere.
5. What is the smallest unit of life capable of performing all life functions?
- A. Atom
- B. Molecule
- C. Cell ✅
- D. Tissue
Explanation: The cell is the basic structural and functional unit of all living organisms.
6. Which Muslim scientist is known for contributions to medicine and biology?
- A. Ibn Rushd
- B. Bu Ali Sina (Avicenna) ✅
- C. Al-Biruni
- D. Al-Khwarizmi
Explanation: Bu Ali Sina made foundational contributions in medicine, identifying diseases like meningitis and tuberculosis.
7. What is the main component of protoplasm?
- A. Glucose
- B. Carbon dioxide
- C. Water ✅
- D. Calcium
Explanation: Water forms the largest component of protoplasm, essential for cell functions.
8. Which branch of biology involves manipulation of genes?
- A. Paleontology
- B. Taxonomy
- C. Biotechnology ✅
- D. Entomology
Explanation: Biotechnology deals with genetic engineering to produce useful products like insulin.
9. Which term describes a group of organisms of the same species living together?
- A. Community
- B. Population ✅
- C. Ecosystem
- D. Biosphere
Explanation: A population includes all individuals of a species in a particular area.
10. What type of cellular organization is seen in Volvox?
- A. Unicellular
- B. Colonial ✅
- C. Multicellular
- D. Acellular
Explanation: Volvox is a colonial alga where cells live together but function independently.
11. Which biological method step involves forming a testable prediction?
- A. Law
- B. Observation
- C. Hypothesis ✅
- D. Conclusion
Explanation: A hypothesis is a tentative explanation that can be tested through experimentation.
12. What is the term for reasoning that moves from general principles to specific conclusions?
- A. Inductive reasoning
- B. Deductive reasoning ✅
- C. Hypothesis
- D. Experimentation
Explanation: Deductive reasoning applies general knowledge to reach specific, testable conclusions.
13. Which profession applies biology in improving crop yield and plant varieties?
- A. Pharmacology
- B. Forestry
- C. Horticulture ✅
- D. Biophysics
Explanation: Horticulture focuses on developing better plant varieties, often using biology-based techniques.
14. Volvox is an example of which type of cellular organization?
- A. Multicellular
- B. Colonial ✅
- C. Unicellular
- D. Organ level
Explanation: Volvox is a colonial organism where many similar unicellular organisms live together but function independently.
15. Which biological tool magnifies tiny organisms and structures for observation?
- A. Centrifuge
- B. Microscope ✅
- C. Thermometer
- D. Electrophoresis
Explanation: Microscopes are used to observe cells and microorganisms that are not visible to the naked eye.