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Textbook Questions and Answers 1. Fill in the blanks with the proper words. a. The wavelength of visible light is between …………………..….. and …………………..…. .b. GMRT is used for …………………..….. waves.c. A certain X-ray telescope is named after scientist …………………..…. .d. The first scientist to use a telescope for space observations …………………..…. .e. The biggest … Read more

Textbook Questions and Answers 1. Complete the following sentences by choosing the appropriate words from the brackets.(Inheritance, sexual reproduction, asexual reproduction, chromosomes, DNA, RNA, gene) a. Hereditary characters are transferred from parents to offsprings by …………………………….., hence they are said to be structural and functional units of heredity.b. Organisms produced by …………………………….. show minor variations.c. … Read more

Textbook Questions and Answers 1. Each of the following statements is wrong. Rewrite them correctly by changing either one or two words. a. Simple squamous epithelium is present in the respiratory tract.b. Glandular epithelium is present in kidneys.c. Chlorenchyma helps the plant to float in water.d. Striated muscles are also called involuntary muscles.e. Chloroplast is … Read more

Textbook Questions and Answers 1. Match the pairs and explain. Column ‘A’ Column ‘B’ (1) Growth of pollen tube towards ovules(2) Growth of shoot system(3) Growth of root system(4) Growth towards the water (a) Gravitropic movement(b) Chemotropic movement(c) Phototropic movement(d) Growth-irrelevant movement(e) Hydrotropic movement Answer:(1 – b),(2 – c),(3 – a),(4 – e). 2. Complete … Read more

Textbook Questions and Answers 1. Fill in the blanks. a. The number of molecules of water of crystallization in washing soda is …………….…. .b. The chemical name of baking soda is …………….…. .c. …………….…. is used in treatment of hyperthyroidism.d. The chemical name of Teflon is …………….…. .Answer:a. 10b. Sodium bicarbonatec. Iodine -123d. Polytetra fluoroethylene … Read more

Textbook Questions and Answers 1. Fill in the blanks. a. The number of molecules of water of crystallization in washing soda is …………….…. .b. The chemical name of baking soda is …………….…. .c. …………….…. is used in treatment of hyperthyroidism.d. The chemical name of Teflon is …………….…. .Answer:a. 10b. Sodium bicarbonatec. Iodine -123d. Polytetra fluoroethylene … Read more

Textbook Questions and Answers 1. Select the proper option and complete the statements(single, all, double, ionic, carbon, give and take, hydrogen, multiple, share, most, covalent) a. A carbon atom forms a ….……………. bond with other atoms. In this bond the two atoms ….electrons.Answer:covalent, share b. All the carbon bonds in a saturated hydrocarbon ….……………. electrons.Answer:share … Read more

Textbook Questions and Answers 1. Fill in the blanks and explain. a. Sound does not travel through ……………………….……….. .b The velocity of sound in steel is ……………………….………… than the velocity of sand in water.c. The incidence of ……………………….………… in daily life shows that the velocity of sound is less than the velocity of light.d. To … Read more

Textbook Questions and Answers 1. Fill in the blanks to complete the statements. Justify the statements. a. While working with a computer we can read the information stored in its memory and perform other actions in ………………………. memory.b. While presenting pictures and videos about the works of scientists, we can use ……………………… .c. To draw … Read more

Textbook Questions and Answers 1. Match the items in column ‘A’ with the proper ones in coloum ‘B’ and explain their impact on the environment. Column ‘A’ Column ‘B’1. Harmful waste – a. Glass, rubber, carry bags, etc.2. Domestic waste – b. Chemicals, pigments, ash, etc.3. Biomedical waste – c. Radioactive material4. Industrial waste – … Read more