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Draw in sequence (showing the four stages), the process of binary fission in Amoeba. CBSE- class10- Chemistry 20171 AnswerMention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction. CBSE- class10- Chemistry 21 AnswerWhich gas is present in Bio – gas and CNG? Write its molecular formula. CBSE- class10- Chemistry 20161 AnswerWhat is “dispersion of white light”? Draw a labelled diagram to illustrate the recombination of the spectrum of white light. Why it is essential that the two prisms used for the purpose should be identical and placed in an inverted position wit1 AnswerStudy the following ray diagram: In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by, CBSE- class10- Chemistry 20171 Answer“A lens can f orm a magnified erect image as well as magnified inverted image of an object placed in front of it ” . State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of O, F and 2F in the dia1 AnswerWhy certain compounds are called hydrocarbons? Write the general formula for homologous series of alkanes, alkenes and alkynes and also draw the structure of the first member of each series . Write the name of the reaction that converts alkenes into 1 AnswerWith the help of one example for each, distinguish between the acquired traits and the inherited traits . Why are the traits/ experiences acquired during the entire lifetime of an individual not inherited in the next generation? Explain the reason o1 AnswerWrite the functions of each of the following parts in a human female reproductive system. (b) Write the structure and functions of placenta in a human female. CBSE- class10- Chemistry 20171 AnswerWhile studying the saponification reaction, what do you observe when you mix an equal amount of colourless veg etable oil and 20% aqueous solution of NaOH in a beaker? CBSE- class10- Chemistry 20171 AnswerWhen you add a few drops of acetic acid to a test - tube containing sodium bicarbonate powder, which one of the following is your observation? CBSE- class10- Chemistry 20171 AnswerA student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens. CBSE- class10- Chemistry 20171 AnswerThe following vegetables are kept in a basket. Which two of these vegetables correctly represent the homologous structures? CBSE- class10- Chemistry 20171 AnswerTo perform an experiment to identify the different parts of an embryo of a dicot seed, first of all you require a dicot seed. Select dicot seeds from the following group: CBSE- class10- Chemistry 20171 AnswerStudy the given ray diagrams and select the correct statement from the following: CBSE- class10- Chemistry 20171 AnswerExplain the meaning of democracy.-cbse-civics-class10-20171 AnswerDifferentiate between biodegradable and non - biodegradable substances with the help of one example each. List two changes in habit that people must adopt to dispose non - biodegradable waste, for saving the environment. CBSE- class10- Sci1 AnswerWhich challenge is faced by every democracy in one form or other?-cbse-civics-class10-20171 AnswerWhat 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 Answer