Gap Method

Many young educted couple prefer to adopt safe period or periodic abstinance method to have sufficient gap between children. It is a right method ? Jsuggest suitable method if you do not agree with their approach.

Gap juction are characteristically found in

Explain the meaning of infaltionary gap an d eflationary gap with the help of diagrams.

Gap junctions : -

When a metal ring having some gap is heated (a) length of gap increases (b) radius of the ring decreases (c) the angle substanded by the gap at the centre remains same (d) length of gap decreases