Nutrition Long Answer Biology Class-9 ICSE Selina Publishers

Nutrition Long Answer Biology Class-9 ICSE Selina Publishers Solutions Chapter-10. Step By Step ICSE Selina Concise Solutions of Chapter-10 Nutrition (Nutrition in General) with Exercise-10 including MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type and Structured/Application Questions Solved . Visit official Website CISCE for detail information about ICSE Board Class-9.

Nutrition Exe-10 Long Answer Biology Class-9 ICSE Concise Selina Publishers

Board	ICSE
Publications	Selina Publication
Subject	Biology
Class	9th
Chapter-10	Nutrition (Nutrition in General)
Book Name	Concise
Topics	Solution of D. Long Answer Type
Academic Session	2023-2024

D. Long Answer Type

Nutrition (Nutrition in General) Class-9 Biology Concise Solutions

Page 107

Question 1.

Distinguish between the following pairs on the basis of the words indicated in the brackets :

(a) Monosaccharides and Disaccharides (Number of carbon atoms)

(b) Kwashiorkor and Marasmus (Age)

(d) Malnutrition and Under-nutrition (Definition)

(e) Iron and Iodine. (Deficiency diseases)

Answer:

(a) Difference between Monosaccharides and Disaccharides (Number of carbon atoms):

Monosaccharides	Disaccharides
The number of carbon atoms is six.	The number of carbon atoms is twelve

(b) Difference between Kwashiorkor and Marasmus (Age):

Kwashiorkor	Marasmus
It affects children of 2-5 years of age.	It affects infants below the age of 1 year.

(c) Difference between Tocopherol and Pantothenic acid (Solubility):

Tocopherol	Pantothenic acid
It is soluble in fat.	It is soluble in water.

(d) Difference between Malnutrition and Undernutrition (Definition):

Malnutrition	Undernutrition
Malnutrition is the condition in which a person suffers due to an unbalanced diet. It includes both deficiency as well as an excess of nutrients in a person’s diet.	Undernutrition refers to the condition in which a person suffers from poor nutrition caused by not having enough food containing essential nutrients.

(e) Difference between Iron and Iodine (Deficiency diseases):

Iron	Iodine
Iron deficiency results in Anaemia.	Iodine deficiency causes Goitre and Cretinism.

Question 2.

List the six main purposes for which food is required by the body.

Answer:

Need for food by the body:

(1) Growth: Food is necessary for building new protoplasm or cells. This helps in the growth of an organism.

(2) Repair: Food provides materials for the repair of worn out or damaged cells and tissues.

(3) Energy: We obtain energy from food. This energy is required for carrying out various life functions.

(4) Maintenance: Nutrients obtained through food help to maintain the chemical composition of cells.

(5) Provision of raw materials: Raw materials required for the synthesis of products such as enzymes, hormones, sweat, milk, etc. are obtained through food.

(6) Protection: Food provides protection from diseases and infection.

Question 3.

Why are proteins necessary in our food?

Answer:

Proteins are the body building foods. They provide the chemical material for the growth and repair of body cells and tissues. At the time of emergency, proteins can also be oxidized in the body to release energy.

Question 4.

Taking the examples of whole grain atta, fruit and green leafy vegetables, describe how roughage in our diet is useful.

Answer:

Whole grain atta, fruits and green leafy vegetables are the chief sources of roughage.

(1) Roughage does not provide any nutrients to our body. It still has nutritive value and is essential for the proper functioning of the gut.

(2) It absorbs a lot of water and retains it. In this way, it keeps faecal matter soft preventing constipation.

(3) It combines with intestinal waste and makes it bulky.

(4) It helps in the formation of stools and helps our body to expel the undigested waste food.

(5) Roughage expands the intestinal lumen and helps in slow and smooth movement of food through the gastrointestinal tract. This movement is required for proper and complete digestion of food and for the elimination of intestinal waste.

(6) Roughage stimulates secretion from the digestive tract and also helps in removal of cholesterol, fatty secretory substances and toxins from the body.