Biology is an important subject that helps students understand life and living organisms. Class 9 Biology Chapter 1 – The Science of Biology is the first step for students to explore the fascinating world of living things. In this chapter, students learn the basic concepts of biology and how this science helps us understand nature and life around us.
This chapter explains biology and its branches, helping students understand the different fields of biology and their importance. It also describes the relation of biology with other sciences and shows how different scientific fields work together to study living organisms. Students will also learn about careers in biology, which introduces various professional opportunities such as medicine, agriculture, biotechnology, and environmental sciences.
📥 Download Complete Chapter 1 Notes – The Science of Biology
Skip to PDF contentThis PDF includes complete notes of Class 9 Biology Chapter 1 – The Science of Biology. The notes contain important MCQs, short questions, and detailed long questions prepared according to the Punjab Board syllabus.
MCQs – The Science of Biology
1. Which branch of Biology focuses on the study of the structure and function of cells?
(a) Cytology ✅
(b) Ecology
(c) Histology
(d) Anatomy
2. Which branch of Biology involves the study of the classification of organisms?
(a) Taxonomy
(b) Physiology ✅
(c) Palaeontology
(d) Biogeography
3. The word “Biology” is derived from which language?
(a) Latin
(b) Arabic
(c) Greek ✅
(d) French
4. Which branch focuses on biological molecules like proteins and DNA?
(a) Embryology
(b) Pharmacology
(c) Molecular Biology ✅
(d) Pathology
5. Biochemistry is the study of:
(a) Muscles and bones
(b) Living organisms
(c) Fossils
(d) Chemical substances and reactions in living organisms ✅
6. According to the Quran, all living things are made from:
(a) Fire
(b) Clay
(c) Water ✅
(d) Light
7. In Surah Al-Mominoon, human development is described in stages starting from:(a) Bone
(b) Flesh
(c) Nutfah ✅
(d) Blood
8. The field of Artificial Intelligence combines disciplines like:
(a) Psychology
(b) Engineering
(c) Computer Science
(d) All of these ✅
9. Which of the following is a biological law?
(a) Newton’s law
(b) Ohm’s law
(c) Hardy-Weinberg law ✅
(d) Law of motion
10. Who proposed the hypothesis that mosquitoes transmit malaria?
(a) Ronald Ross ✅
(b) A.F.A. King
(c) Laveran
(d) Pasteur
FAQs
Question 1: Differentiate between Morphology and Physiology.
Answer:
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Morphology: The study of the form and structure of organisms, including their external and internal features, such as shape, size, and arrangement of organs.
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Physiology: The study of the functions and processes of living organisms and their parts, focusing on how organs and tissues carry out their tasks in the body.
Key Point for Students:
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Morphology = Structure
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Physiology = Function
Question 2: What are the major fields of Biology?
Answer:
The major fields of Biology are:
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Zoology: The study of animals, including their structure, function, behavior, and diversity.
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Botany: The study of plants, including their structure, growth, reproduction, and interactions with the environment.
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Microbiology: The study of microorganisms such as bacteria, fungi, and viruses, focusing on their structure, function, and effects on health and the environment.
Question 3: What is Biochemistry?
Answer:
Biochemistry is the study of the structure and reactions of chemical substances present in living organisms. It includes the study of important biological processes such as photosynthesis, respiration, and metabolism.
Key Point for Students:
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Biochemistry connects biology and chemistry to understand life at a molecular level.
Question 4: What is a scientific theory?
Answer:
A scientific theory is a well-tested explanation of natural phenomena, supported by repeated experiments and observations.
Key Point for Students:
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Theories explain why or how something happens in nature.
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They are different from laws, which describe patterns without explaining them.
Question 5: What is meant by ‘science as a collaborative field’?
Answer:
Science as a collaborative field means that experts from different disciplines work together to solve complex problems.