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Biology · Chapter 1: Introduction to Biology
Branches of Biology
Biology is divided into branches such as anatomy, physiology, genetics, ecology, taxonomy and biotechnology. Learn what each branch studies, with simple examples.
Key termRememberExampleWatch out
01Concept
Biology is a very large subject, so it is divided into smaller parts called branches. Each branch studies living things from one point of view, such as their structure, their working, or their history. Many branch names end in -logy, which means study of.
Branches that study structure
| Branch | What it studies | Example |
|---|---|---|
| Morphology | Form and structure of organisms | Comparing the shapes of leaves of different plants |
| Anatomy | Internal structure, usually by cutting open (dissection) | Looking at the heart and lungs inside a frog |
| Histology | Tissues (groups of similar cells), using a microscope | Layers of cells in the skin |
| Cell Biology | Cells and their parts (organelles) | How the nucleus controls a cell |
Branches that study how living things work
| Branch | What it studies | Example |
|---|---|---|
| Physiology | How organs and body systems work | How the kidneys clean the blood |
| Biochemistry | Chemicals and chemical reactions in living things | How food is broken down to release energy |
| Molecular Biology | Molecules of life such as DNA and proteins | How DNA carries instructions for the body |
Branches that study heredity, development and history
| Branch | What it studies | Example |
|---|---|---|
| Genetics | Inheritance: how features pass from parents to offspring through genes | Why children look like their parents |
| Embryology | Development of an embryo (a young organism before birth or hatching) | How a chick forms inside an egg |
| Palaeontology | Fossils: remains or traces of organisms that lived long ago | Fossils of early whales found in Balochistan, Pakistan |
| Taxonomy | Classification and naming of organisms | Giving the mango its scientific name, Mangifera indica |
Branches that study living things together
| Branch | What it studies | Example |
|---|---|---|
| Ecology (Environmental Biology) | Organisms and their environment, and how they affect each other | How pollution affects fish in a lake |
| Socio-biology | Social behaviour of animals living in groups | How honeybees share work in a hive |
| Parasitology | Parasites: organisms that live on or in another organism and harm it | The malaria parasite, Plasmodium |
| Immunology | The immune system: the body's defence against disease | How vaccines protect us |
Applied branches and branches named after organisms
| Branch | What it studies | Example |
|---|---|---|
| Biotechnology | Using living things to make useful products | Bacteria that make human insulin for diabetic patients |
| Pharmacology | Medicines (drugs) and their effects on the body | How a painkiller works |
| Entomology | Insects | Studying mosquitoes to control dengue |
| Marine Biology | Life in the sea | Fish and turtles of the Arabian Sea |
02Real World Examples
Doctors and hospitals
Every doctor studies anatomy and physiology to understand the body, and pharmacology to choose the right medicine.
Better crops
Plant scientists use genetics to develop crop varieties that give more grain and resist disease.
Saving the mangroves
Ecologists study the mangrove forests of the Indus Delta on the Sindh coast and help plant and protect them.
Stopping disease
Immunology led to vaccines, and entomology helps control mosquitoes that spread malaria and dengue.
03Practice Questions
Try to answer in your own words first, then open the model answer.
Short questions
Q1.What is meant by a branch of biology? Why is biology divided into branches?Show answer
Answer
A branch of biology is a part of biology that studies living things from one particular point of view, such as their structure or function.
Biology is divided into branches because it is a very large subject. Dividing it makes it easier to study each part in detail.
Q2.Differentiate between anatomy and physiology.Show answer
Answer
| Anatomy | Physiology |
|---|---|
| Studies the internal structure of organisms | Studies how organs and systems work |
| Usually done by dissection | Usually done by experiments and measurements |
| Structure of the heart | How the heart pumps blood |
Q3.Define palaeontology and give one example.Show answer
Answer
Palaeontology is the branch of biology that studies fossils, the remains or traces of organisms that lived long ago.
Example: studying fossils of early whales found in Balochistan, Pakistan.
Q4.Which branch of biology deals with: (a) inheritance, (b) insects, (c) tissues, (d) classification?Show answer
Answer
- (a) Inheritance: Genetics
- (b) Insects: Entomology
- (c) Tissues: Histology
- (d) Classification and naming: Taxonomy
Long questions
Q5.Describe any six branches of biology, giving an example of each.Show answer
Answer
- Morphology: the study of the form and structure of organisms. Comparing leaf shapes.
- Anatomy: the study of internal structure, usually by dissection. The parts inside a frog.
- Physiology: the study of how organs and systems work. How the kidneys clean the blood.
- Genetics: the study of inheritance through genes. Why children look like their parents.
- Ecology: the study of organisms and their environment. How pollution affects fish.
- Taxonomy: the classification and naming of organisms. The mango is named Mangifera indica.
(Other correct answers include histology, embryology, palaeontology, parasitology, immunology, biotechnology and pharmacology.)