Fill in the blanks:
(i) The secretion of …………. hormone occurs in males.
(ii) Waste by-products removed from the body, this process is called as …………….. .
(iii) Ozone layer protects against the …………… from the sun.
(iv) The example of ……….. fuel are coal and petroleum.
(v) Half the distance between the pole and the center of curvature of the spherical mirror is called ………….. .
(vi) The unit of electric power is ……………. .
