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What are the hydrocarbons? Distinguish alkanes from alke nes and each of them from alkynes giving one example of each. Also draw the structure s of each compound cited as example to justify your answer . CBSE class10 Science 20161 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 AnswerList two physical and two chemical properties of acetic acid which a student can test in the school laboratory. CBSE class10 Science 20161 AnswerState the meaning of “biodiversity”. List one advantage each of conserving f orests and wild life. CBSE class10 Science 20161 Answer( a ) Fertilization is possible if ovulation has taken place during middle of menstrual cycle. Give reasons . ( b ) List in tabular form two distinguishing features between a sperm and an ovum. CBSE class10 Science 20161 AnswerState and describe in brief any three main factors responsible for the rise of new species. CBSE class10 Science 20161 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 AnswerList four problems caused by non – biodegradable wastes . CBSE class10 Science 20161 AnswerList four problems caused by non – biodegradable wastes . CBSE class10 Science 20161 AnswerName two plants that are grown by vegetative propagation. CBSE class10 Science 20161 AnswerWhat is the focal length of a plane mirror? Which mirror has larger field of v iew – concave or convex? Where is this property of the mirror used? CBSE class10 Science 20161 AnswerOut of potato, sweet potato pea tendril and spinach, which two are analogou s structures and why? CBSE class10 Science 20161 Answer( a ) What are fossils? How are fossils formed? Describe in brief, two methods of determining the age of fossils . ( b ) List any two roles of fossils in tracing evolutionary relationships . CBSE class10 Science 20161 AnswerIn the following food chain, plants provide 2000 J of energy to rats. How much e nergy will be available to hawks from snakes ?Plants->Rats->Snakes->Hawks, CBSE class10 Science 20161 AnswerWhat is reproduction? Explain two advantages of sexual reproduction over a sexual reproduction . 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 AnswerWhich gas is present in Bio – gas and CNG? Write its molecular formula. CBSE- class10- Chemistry 20161 AnswerName the life process of an organism that helps in the growth of its population. CBSE- class10- Science 20151 AnswerThe first trophic level in a food chain is always a green plant. Why? CBSE- class10- Science 20152 Answer