Frank Brothers Solutions for ICSE Class 9 Biology Chapter 1 An Introduction

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Solution 1:
Biology is the branch of science dealing with the study of living organisms.
The two main branches of Biology are Botany and Zoology.
Biology helps us discover the secrets of every living thing from the smallest cell to the largest whale. By splitting it into Botany and Zoology, we can focus on the unique needs and structures of plants versus animals.
Teacher's Tip: Remember 'Zoo' for Zoology because animals live in a zoo!
Exam Tip: Always name both main branches when defining Biology for full credit.

Solution 2:
Biology is the branch of science dealing with the study of living organisms including their structure, evolution, growth and environment.
Biology is important in our daily life in the following ways:
1. Food - Study of various food components helps in understanding balanced diet and its significance. We get food directly or indirectly through agriculture, which is helped by the studies of different branches of Biology.
2. Health - Biology helps us to understand structure and functions of our various body parts as well the various diseases that we suffer from and their cure.
3. Agriculture - Biology helps us to increase the overall agricultural production by providing knowledge about new methods of farming, improved seed varieties and crop protection against many diseases.
4. Clothes - Materials for making clothes like wool, fur and silk are obtained from animals whereas cotton is obtained from plants. Biology deals with these animals and plants.
5. Industry - Many industries are based on animal and plant products like leather, horn, shells, honey, wax, pearl, wood, rubber etc. Increased manufacture of these products can be achieved using the knowledge of Biology.
6. Human Diseases - Many animals cause and transmit diseases. Also many animals are used for testing new drugs before use on humans. The tremendous advances in human physiology, medicine and surgery have come from the study of zoology.
7. Aesthetic value - We keep many animals like birds, fishes and butterflies for entertainment and hobby. Visiting gardens and parks also gives us aesthetic pleasure. Biology helps in the study of these animals and plants to provide us better aesthetic value.
8. Improvement of domestic animals - Raising improved breeds of domestic animals gives better yields and this is made possible by zoology and genetics.
9. Space research - Biology helps in man’s quest of knowing about extra terrestrial life.
Biology is a vast subject that touches every part of our existence, from the food on our plates to the clothes we wear. By studying living things, we can solve problems in medicine and find new ways to protect our natural environment.
Teacher's Tip: Use the first letter of each point (F-H-A-C-I-H-A-I-S) to create a short sentence for memorizing.
Exam Tip: Use descriptive headings for each point to make your answer look organized and professional.

Solution​​​​​​​ 3:
Zoology - The study of animals
Entomology - The study of structure, habit and classification of insects.
Mycology - Scientific study of fungi
Virology - Scientific study of virus
Pathology - Study of different types of plant and animal diseases
Microbiology - Study of microorganisms
Palaeobotany - Study of fossils of plants
Palaeozoology - Study of fossils of animals
Genetics - Study of heredity and inheritance
Cytology - Study of structure and functions of the cell
These specialized branches allow scientists to focus on specific groups of organisms or biological processes. Understanding these terms helps us navigate complex topics like disease control and ancient history through fossils.
Teacher's Tip: Most branches end in "logy," which comes from the Greek word 'logos' meaning 'study of'.
Exam Tip: Pay close attention to the spelling of 'Palaeobotany' and 'Entomology' as they are frequently misspelled.

Solution​​​​​​​ 4:
Study of Biology is advantageous to us in many ways. These are:
1. It helps us to understand ourselves better such as our body activities, our hereditary, our evolution, need for food, life and death etc.
2. It helps us to remain healthy and fit by knowing our body structure and functioning.
3. It tells us about the types of human diseases and their causes. It also helps in the prevention and cure of human diseases.
4. Biology ensures maximum utilization of resources available to us such as increasing crop production, improving breeds of useful animals, using microbes in food, industry and medicine, curing diseases and overall improving the quality of life.
5. It informs us about the negative consequences of excessive use of fertilizers and pesticides like degradation of soil quality and harming living beings including humans through food chains.
6. Biology tells us about the problems of deforestation and its effects on the environment.
7. It makes us aware about the causes and harmful effects of pollution and ways of controlling it.
8. Biology stresses the need for conservation of natural resources, so that they are available to future generations.
9. It informs us about our responsibility towards other forms of life and our planet at large, for sustainable living.
10. It makes us aware of the need to maintain the delicately balanced ecosystem containing various food chains and food webs.
11. Biology solves many problems facing mankind such as eradication of fatal diseases, decreasing environmental pollution, increasing food supply, recharging fresh water resources etc.
By learning Biology, we gain the tools to live sustainably and protect the biodiversity of Earth. It empowers us to make informed choices about health, diet, and environmental protection for a better future.
Teacher's Tip: Think of Biology as the "Manual for Life" on Earth.
Exam Tip: Highlight keywords like "Conservation," "Ecosystem," and "Pollution" to show a deep understanding of biological advantages.

Solution​​​​​​​ 5:
The five main branches of Biology are:
1. Zoology - It is the study of animals
2. Botany - It refers to the study of plants
3. Microbiology - It refers to the study of microorganisms
4. Ecology- It deals with the study of relationship between living organisms and their environment.
5. Pathology- It deals with the study of different types of plant and animal diseases.
These five branches cover the entire spectrum of life from microscopic bacteria to giant elephants. Each branch provides unique insights into how life survives and interacts across different environments.
Teacher's Tip: Remember "Z-B-M-E-P" to keep these five main branches in your head.
Exam Tip: When asked for the main branches, always include a brief one-line definition for each to score full marks.

Solution​​​​​​​ 6:
Zoology is the branch of Biology dealing with the study of animals.
Botany is the branch of Biology dealing with the study of plants.
Zoology looks at how animals move, eat, and behave in nature. Botany focuses on how plants grow, make food through photosynthesis, and support the planet's oxygen supply.
Teacher's Tip: Plants grow in 'Botanical Gardens', so Botany is the study of plants.
Exam Tip: Don't get confused between the two; always associate 'Zoo' with animals.

Solution​​​​​​​ 7:
Morphology is the study of the form and structure of living organisms.
The study of tissues of organisms with the help of microscopes is called histology.
Ecology is the branch of biology dealing with the study and relationship of environment with living organisms and its effect on structure, distribution and habitat.
Genetics is defined as the study of heredity and inheritance.
Biochemistry is the study of the metabolic activities of chemical materials.
Pathology is the branch of Biology dealing with the study of different types of plant and animal diseases, their symptoms, causative agents and methods of control.
Each of these fields helps scientists understand life from different perspectives, like looking at the outside shape (Morphology) or the inside chemicals (Biochemistry). Together, they help us understand the complex puzzle of how living things work.
Teacher's Tip: Think of morphology as the 'map' of an organism's body.
Exam Tip: Define Histology as the study of 'tissues' and mention the use of 'microscopes' for a perfect answer.

Solution​​​​​​​ 8:
Paleontology / Palaeobiology
The Greek philosopher, Aristotle
Lamarck and Treviranus coined the term Biology in 1801.
Ecology
Teratology
Theophrastus
These facts highlight the long history of human interest in the living world around them. Great thinkers like Aristotle paved the way for modern science by systematically observing animals and plants.
Teacher's Tip: Aristotle is the 'Father of Biology', and his student Theophrastus is the 'Father of Botany'.
Exam Tip: Memorize the year 1801 and the names Lamarck and Treviranus for history-based questions.

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Solution​​​​​​​ 9:
Physiology - Vital activities
Microbiology - Microbes
Embryology - Life-cycle
Entomolgy - Insects
Cytology - Cells
Histology - Tissues
These matching pairs link biological terms to the specific focus of their study. Knowing these roots helps you understand new scientific words when you encounter them.
Teacher's Tip: 'Cyto' always refers to cells, and 'Histo' always refers to tissues.
Exam Tip: Use a ruler to draw neat lines or write the correct pairs side-by-side during matches.

Solution​​​​​​​ 10:
Differences between plants and animals:
Character: Size
Plants: Generally not definite
Animals: Size is definite
Character: Chlorophyll
Plants: Present in all plants
Animals: Absent in animals except in $Euglena$
Character: Mode of nutrition
Plants: Autotrophic, taking in water and carbon dioxide
Animals: Heterotrophic, taking in solid complex food materials.
Character: Growth
Plants: Indefinite and unlimited, growing throughout life
Animals: Definite and limited, stop growing in size after a certain age
Character: Locomotion
Plants: Usually fixed on ground and unable to move, except for a few lower plants
Animals: Usually move from place to place for food and other requirements, except for a few animals fixed to a place.
Character: Organs
Plants: No special organs for respiration, excretion and digestion
Animals: Special organs for respiration, excretion and digestion in higher animals
Character: Nervous system and sense organs
Plants: Sense organs and nervous system absent
Animals: Sense organs and nervous system present in most animals
Character: Excretory system
Plants: Absent
Animals: Present
Character: Cell structure - Cell wall
Plants: Present
Animals: Absent
Character: Cell structure - Centrosome
Plants: Absent in plant cells except in few plants
Animals: Present near the nucleus
Character: Cell structure - Vacuoles
Plants: Present
Animals: If present, small and temporary
Character: Stored food
Plants: In the form of starch
Animals: In the form of glycogen
While plants and animals are both alive, they solve the problems of survival in very different ways. For example, plants make their own food using chlorophyll, while animals must find food in their environment.
Teacher's Tip: Remember that plants are "Stationary Producers" and animals are "Mobile Consumers".
Exam Tip: Create a clear table with headings for "Character," "Plants," and "Animals" to make your comparison easy to read.

Solution​​​​​​​ 11:
Areas of Biology which have developed recently are:
1. Enzymology
2. Immunology
3. Genetic Engineering
4. Radiation Biology
5. Forensic Science
6. Biophysics
7. Cybernetics
(Write any three)
New technologies have opened up exciting fields like Genetic Engineering, where we can modify DNA to help people. Forensic science uses biology to solve crimes, showing how science is used in our legal system.
Teacher's Tip: Modern biology often combines with other sciences like Physics (Biophysics) and Computers (Cybernetics).
Exam Tip: Always check if the question asks for a specific number of items, such as "Write any three."

Solution​​​​​​​ 12:
1. (b) All living beings
2. (b) Cell, tissue, organ system
3. (a) Lamarck and Treviranus
4. (c) respire all the time
5. (b) genetics
These answers provide a summary of basic biological principles, from who named the science to how living things are organized. Understanding that respiration is a 24/7 process helps us appreciate the constant energy needs of life.
Teacher's Tip: When answering MCQs, eliminate the obviously wrong answers first.
Exam Tip: Read every option carefully, as sometimes two answers can look very similar.