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Textbook Questions and Answers 1. Who am I? Question a.I am ATP producing factory.Answer:Mitochondria Question b.I am single-layered but maintain cellular osmotic pressure.Answer:Vacuole Question c.I support the cell, but I am not cell wall. I have a body resembling net.Answer:Endoplasmic reticulum Question d.I am chemical factory of the cell.Answer:Chloroplasts in case of plant cells can … Read more

Textbook Questions and Answers 1. Answer the following in your own words. Question a.Explain the relation between continuous rains and landslide. Give reasons.Answer:Before the actual landslide, many changes occur in the surrounding hilly ground. The hard rocks develop cracks and crevices. These are natural changes but due to man-made activities, the cracks are widened due … Read more

Textbook Questions and Answers 1. Following are some statements about pollution. Which type of pollution do those express: Question a.Fog seems to be appearing in Delhi during day hours.Answer:Air pollution-Smog(The sentence should have the word Smog and not fog. Smog is fog with smoke. Only fog cannot be polluting, but the smog is.) Question b.Many … Read more

Textbook Questions and Answers 1. Complete the table: Question a. Answer: Property of metal Use in everyday life i. Ductility i. Gold, silver ornaments ii. Malleability ii. Aluminium sheets, galvanised sheets iii. Conduction of heat iii. Stainless steel vessels, copper vessels, boilers iv. Conduction of electricity iv. Copper wires v. Sonority v. Brass articles 2. … Read more

Textbook Questions and Answers 1. Choose the appropriate option and rewrite the following statements: Question a.The intermolecular force is ……………. in the particles of solid.(a) minimum(b) moderate(c) maximum(d) indefiniteAnswer:(c) maximum Question b.Solids retain their volume even when external pressure is applied. This property is called …………… .(a) plasticity(b) incompressibility(c) fluidity(d) elasticityAnswer:(d) elasticity Question c.Matter is … Read more

Textbook Questions and Answers 1. Answer the following. Question a.What is the difference in the atomic models of Thomson and Rutherford?Answer: Thomson’s atomic model Rutherford’s atomic model 1. According to Thomson’s atomic model, the negatively charged electrons are embedded in a gel of positive charge. 1. According to Rutherford’s atomic model the negatively charged electrons … Read more

Textbook Questions and Answers 1. Write proper words from the following group of words in the blanks and rewrite the completed sentences:(magnetism, 4.5V, 3.0V, gravitational attraction, potential difference, potential, higher, lower, 0V) Question a.Water in the waterfall flows from a higher level to the lower level because of …………… .Answer:Water in the waterfall flows from … Read more

Textbook Questions and Answers 1. Write proper word In the blank space: Question a.The SI unit of force is the ………..(dyne, newton, joule)Answer:The SI unit of force is the newton. Question b.The air pressure on our body is equal to the …………. pressure.(atmospheric, sea bottom, space)Answer:The air pressure on our body is equal to the atmospheric pressure. Question … Read more

Textbook Questions and Answers 1. Distinguish between- Infectious and non – infectious diseases. Infectious diseases Non-infectious diseases 1. The diseases which can be transmitted from one patient to other person are called infectious diseases. 1. The diseases which cannot be transmitted from one patient to other person, are called non-infectious diseases. 2. Contaminated air, water, … Read more

Textbook Questions and Answers 1. Use Whittaker method to classify bacteria, protozoa, fungi, algae, prokaryotic, eukaryotic, microbes. Living World And Classification Of Microbes Exercises  Question 1.Use Whittaker method to classify bacteria, protozoa, fungi, algae, prokaryotic, eukaryotic, microbes.Answer: 2.  Complete the five kingdom method of classification using-living organism, prokaryotes, eukaryotes, multicellular, unicellular, protista, animals, plants, fungi. … Read more