1. Name the functional group present in propanone.                                     [1]
Ans.   Ketone is the functional group present in propanone

2. The change in magnetic field lines in a coil is the cause of induced electric current in it. Name the underlying phenomenon.                                                                                                     [1]
Ans.  Electromagnetic induction is the underlying phenomenon.

Answer question numbers 3(a) to 3(d)   and 4(a) to 4(d)   on the basis of your understanding of the following paragraphs and the related studied concepts.

3. The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of population.

 (a)  List two common signs of sexual maturation in boys and girls.                                        [1]

(b) What is the result of reckless female foeticide?