Given below are incomplete explanations of certain biological processes I terms where a key word has been left out. Rewrite the completed explanation by inserting the key word in the space indicated by ‘^’.
(i) Birth rate is the number of ‘^’ birth per thousand of the population per year.
(ii) Photolysis is the splitting of water molecules into hydrogen ions and hydroxyl ions in the presence of ‘^’ and light.
(iii) Vaccine is a preparation consisting of ‘^’ microbes which help to build immunity in the human body.
(iv) Osmosis is the movement of water molecules from its region of high concentration to its region of low concentration through a ‘^’ membrane.
(v) Antiseptics are chemical substances applied to the ‘^’ to destroy or prevent the growth and multiplication of harmful microbes.
