Class 9 General Science Chapter 3 Question Answer

Complete Notes of Class 9 General Science Chapter 3 Question Answer Biochemistry and Biotechnology in 9th Class General Science Urdu Medium by Sir Usman Lateef Suib. These computerized notes are very helpful in the preparation of the Biochemistry and Biotechnology for students of the Class 9 General Science Chapter 3 Question Answer these are according to the new paper patterns of all Punjab boards.

• Important Multiple Choice Questions (MCQs) and Short Questions of Chapter No.3: Biochemistry and Biotechnology in General Science 9th class Urdu Medium.
• Definition of metabolism and explanation.
• Definition of metabolism and explanation.
• Introduction to enzymes, their role in metabolism and our daily life.
• Composition of blood, its types and functions.
• DNA as a hereditary material
• Introduction to genetic engineering and its role in agriculture and live stock.
• Improvement of crops and disease control.
• Introduction to antibiotics and vaccines.
• Recycling of waste materials.
• Biochemistry is a branch of chemistry which deals with all the chemical reactions taking place in living organisms like plants, animals, bacteria, etc. These chemical reactions can help in the synthesis (anabolism) or breakdown (catabolism) of biological molecules. The digested food become part of the body due to anabolic reactions while respiration is a simple catabolic reaction. Its knowledge has been used to produce a large number of material for the benefits of human beings. The term biotechnology was introduced in 1970. The techniques of biotechnology can be used to alter the genetic make up of microscopic organisms to produce useful materials like enzymes and hormones etc.
• Metabolism: A large number of chemical reactions take place in animal and plant cells and cells of biological organisms which are collectively called metabolism. Metabolism consists of two types of reactions which can either synthesize molecules (anabolic reactions) or break the complex molecules. Catabolism is a catabolic reaction in the result of which the complex organic molecules are broken down into simple molecules. Catabolic reactions release energy. This energy can be used in several biological processes.
• In the result of catabolic reactions carbohydrates, proteins and lipids are broken down and oxidized with the help of various enzymes. These reactions release energy which is used to perform many activities in the animals. Anabolism is a synthesining process and the production of carbohydrates is one of its example in which plants use sunlight, carbon dioxide and water. This process is called photosynthesis. The sum of all energy using and energy releasing reactions is called metabolism.
• Digestion and Assimilation: Digestion is a process which breaks down large food particles into smaller molecules. These smaller molecules can then be absorbed by cells for synthetic purposes which is called assimilation.
• Digestion of food is necessary to split the macromolecules like carbohydrates, proteins and fats into simple molecules. These are necessary to be used by organisms to build new compounds. After this the products of digested material is absorbed by the cells of animals and are used either to produce new protoplasm or to provide energy.
• Carbohydrate Metabolism: Wheat, rice, corn, maize are the best sources of carbohydrates. The end products of carbohydrate are simple sugars like glucose, fructose and galactose. One gram of carbohydrate can supply 3.8k calories of energy. The carbohydrates are the cheapest source of diet which provide us the required energy. Excess carbohydrates are converted to glycogen and are stored in muscles and liver.
• Fat Metabolism: There are two sources of fats. We can obtain animal fat from butter oil (ghee) butter or cream, fatty meat and fish oil. The other source of fats is plants like sarson (brassica), olive, coconut, maize, soya bean, cotton seed, sunflower and peanut. Fats are made up of glycerol and fatty acids. They are digested and absorbed by small intestine.