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Write the number of covalent bonds in the molecule of propane, C3H8 . CBSE- class10- Science 20151 AnswerWrite the number of covalent bonds in the molecule of ethane. CBSE- class10- Science 20151 AnswerHow many covalent bonds are there in a molecule of ethane? CBSE Chemistry1 AnswerWhat are chromosomes? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained. CBSE- class10- Science 20151 AnswerTopological winding number of a 2.0 kb covalently closed circular DNA was found to be 191 with a writhing number of -4. Hence, its LINKING NUMBER and the NUMBER OF BASE PAIR PER TURN when the molecule is laid flat on the surface is ________ and _____1 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 AnswerThe first trophic level in a food chain is always a green plant. Why? CBSE- class10- Science 20152 AnswerName the life process of an organism that helps in the growth of its population. 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 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 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 AnswerTaking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on 1 AnswerWhere is DNA found in a cell? CBSE- class10- Science 20151 AnswerDescribe the structure and function of a t-RNA molecule. Why is it referred to as an adapter molecule? cbse-Biology-class-121 AnswerName the gas libe rated when ethanol reacts with S odium metal? How do we get ethe ne from ethanol? Write chemical equation to justify your answer. State the role of acid in this reaction. CBSE class10 Science 20161 Answer