Which one of the following is the most widely accepted method of contraception in India,as at present?

The number of linkage groups in $Pisum$ $sativum$ is:

If a $p-n$ junction is forward biased,then which of the following figures gives the correct direction of current inside the semiconductor?

If $x=9$ is a chord of contact of the hyperbola $x^2-y^2=9$,then the equation of the tangent at one of the points of contact is

There are two wires of the same material and same length. If the diameter of the second wire is $2$ times the diameter of the first wire,then the ratio of the extension produced in the wires by applying the same load will be:

The most significant value of vegetative propagation is that: