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Name the life process of an organism that helps in the growth of its population. CBSE- class10- Science 20151 Answer( a ) What is fragmentation in organisms ? Name a multicellular organism which reproduces by this method. ( b ) How does regeneration take place? Why is this process not possible in all animals? CBSE class10 Science 20161 Answer"Only variations that confer an advantage on an individual organism will survive in a population" . Justify this statement. -cbse-biology-class10-20114 AnswerCompare, giving reasons, the J-shaped and S-shaped models of population growth of a species. cbse-Biology-class-121 AnswerState the meaning of “biodiversity”. List one advantage each of conserving f orests and wild life. CBSE class10 Science 20161 AnswerWhen you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberates immediately with brisk effervescence. Name this gas. Describe the method of testing this gas. CBSE- class10- Science 20151 AnswerWrite the number of covalent bonds in the molecule of propane, C3H8 . CBSE- class10- Science 20151 AnswerThe first trophic level in a food chain is always a green plant. Why? CBSE- class10- Science 20152 AnswerWrite the number of covalent bonds in the molecule of ethane. CBSE- class10- Science 20151 AnswerList six specific characteristics of sexual reproduction. CBSE- class10- Science 20151 AnswerWhat is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the Sun appears reddish at sunrise. CBSE- class10- Science 20151 AnswerList two tests for experimentally distinguishing between an alcohol and a carboxylic acid and describe how these tests are performed. CBSE- class10- Science 20151 AnswerWhat are chromosomes? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained. CBSE- class10- Science 20151 AnswerExplain the following: (a) Speciation (b) Natural Selection CBSE- class10- Science 20151 AnswerDraw the electron - dot structure for ethyne. A mixture of ethyne and oxygen is burnt for welding. In your opinion, why cannot we use a mix ture of ethyne and air for this purpose? CBSE- class10- Science 20151 Answer( a ) Name the part of human eye that helps to focus near and distant objects in quick succession. Explain its functioning. ( b ) A person is advised to wear spectacles with concave lenses. What type of defect of vision is1 AnswerList four points of significance of reproductive health in a society. Name any two areas related to the reproductive health which have improved over the past 50 years in our country. CBSE- class10- Science 20151 AnswerWhat is biodiversity? What will happen if biodiversity of an area is not preserved? Mention one effect of it. CBSE- class10- Science 20151 AnswerList two main causes of the pollution of water of the river Ganga . State how pollution and contamination of river water prove harmful for the health of the people of neighbouring areas. CBSE- class10- Science 20151 AnswerRapid growth of population at present time is due to1 Answer