Selina ICSE Solutions for Class 9 Biology Chapter 1 - Introducing Biology

Selina ICSE Solutions for Class 9 Biology Chapter 1 - Introducing Biology

Exercise 1

A. MULTIPLE CHOICE TYPE

Choose the most appropriate option in the following statements.

(a) Paleontology is the study of

(i) Embryos

(ii) Blood

(iii) Classification 

(iv) Fossils

(b) Clones of animals are being produced through the practice of

(i) Genetics 

(ii) Ecology 

(iii) Embryology 

(iv) Biotechnology

Solution A.

(a) (iv) Fossils

(b) (iv) Biotechnology

B. VERY SHORT ANSWER TYPE

(1) Name the following branches of biology

(a) Application of biological processes in technologies

(b) Science of growing fruits and vegetables

(c) Study of prehistoric forms of life

(d) Study of causes of immunity (resistance to or defense against diseases)

(e) Study of fishes

Solution B.1.

(a) Biotechnology

(b) Horticulture

(c) Palaeontology

(d) Immunology

(e) Ichthyology

(2) Fill in the blanks:

(a) Bioengineering deals with making artificial _________.

(b) __________ is the entire DNA sequence of an organ.

(c) Silk is produced by rearing __________

(d) Evolution deals with the study of ___________ and __________ of organisms.

(e) Organisms which draw food from the host body are called __________

(f) Animals which give birth to young ones are known as ___________

(g)  ___________ is called the Father of Medicine.

Solution B.2.

(a) limbs, joints

(b) Genome

(c) silkworms

(d) origin, descent

(e) parasites

(f) Jeevaj (viviparous)

(g) Hippocrates

(3) Match the branches of biology in Column A with the respective areas of study in Column B.

Column A	Column B
Ichthyology	Viruses
Ornithology	Fishes
Ecology	Birds
Virology	Cells
Herpetology	Diseases
Paleontology	Fossils
Cytology	Snakes
Pathology	Environment

Solution B.3.

Column A	Column B
Ichthyology	Fishes
Ornithology	Birds
Ecology	Environment
Virology	Viruses
Herpetology	Snakes
Paleontology	Fossils
Cytology	Cells
Pathology	Diseases

(4) Name any two borderline sciences which are connected with Biology.

Solution B.4.

1. Biotechnology
2. Bioengineering

(5) Name the respective sub-divisions of biology which deal with the study of insects, birds, fungi and heredity.

Solution B.5.

1. Insects – Entomology

2. Birds – Ornithology

3. Fungi – Mycology

4. Heredity – Genetics

(6) Name some professions other than medicine which require a basic knowledge of Biology.

Solution B.6.

1. Biotechnologist

2. Teacher

3. Bacteriologist

4. Druggist

5. Dentist

6. Entomologist

C. SHORT ANSWER TYPE

1. What is biology? Name and define its three major branches.

Solution C.1.

Biology is the study of living beings, all plants and animals including humans. Biology had flourished greatly in ancient India during 2500 B.C. to 650 B.C. The roots of biology can be traced back to pre-historic periods, when primitive man lived in jungles and caves. Biology has slowly grown through the ages, but developed very fast in the 20th century and is showing signs of even faster growth in the 21st century.

2. How does Biology help us in leading a healthier life?

Solution C.2.

The knowledge of biology has greatly helped us in the field of human health. It helps us to understand the cause of many diseases. We are able to identify various micro-organisms that cause diseases in man. We can study their mode of living and the different ways in which they spread diseases. The understanding of disease-causing microorganisms has led to the development of new drugs, both natural and synthetic drugs that can kill these organisms.

3. A farmer and a housewife may have never studied biology, yet both of them know some of its general principles through experience. State any two principles which they know.

Solution C.3.

A farmer, although has never studied biology, knows by his experience how to increase his produce. He knows how to plough and plant crops and select good quality seeds for sowing. He is also familiar with various methods of irrigation. He knows the technique of cross-breeding and removing weak and unwanted plants and cultivating improved varieties at the right time.

A housewife, by using her experience knows which fruit or vegetable to grow and for how much time. She also knows the nutritional values of various foodstuffs. A housewife adopts various principles of maintaining hygiene at home. She knows to tame some useful animals like cow, goat and dog for her maximum benefit.

4. Distinguish between the following pairs of sciences:

          

(a) Zoology and Entomology

(b) Genetics and Eugenics

(c) Phycology and Mycology

(d) Space Biology and Exobiology

(e) Biotechnology and Bioinformatics

(f) Embryology and Immunology

(g) Ichthyology and Pisciculture

Solution C.4.

(a) Zoology is the study of animals, whereas Entomology is the study of insects.

(b) Genetics is the science of transmission of body characteristics from parents to offspring, whereas Embryology is the study of formation and development of embryos of plants and animals.

(c) Botany is the study of plants, whereas Mycology is the study of fungi.

(d) Space Biology is the study of survival problems of living things in outer space, whereas Exobiology is the study of life elsewhere in the universe.

(e) Biotechnology is the use of living cells or micro-organisms in industry and technology, whereas Bioinformatics is the management and analysis of biological information stored in databases.

D. LONG ANSWER TYPE

1. Do you think Biology can help in further increasing the yield of food? If so, how?

Solution D.1.

Yes, Biology can help in further increasing the yield of food. New varieties of plants and new breeds of cattle, poultry, etc. are being developed with the knowledge of biology. The science has also increased our knowledge of diseases of plants and animals, and how to cure them. All these efforts are helping us to produce more food in fields, dairies and poultry farms.

Selina ICSE Solutions for Class 9 Biology Chapter 1 - Introducing Biology