In animals like bats and owls photoreceptor cells of the retina have mainly rods.
a) What can you infer from this?
b) Write down the function of rods and cons.

a) What are the changes that can be observed with the iron rod and the color of copper sulphate solution if iron rod is dipped in copper sulphate solution? b) Write the equation of the oxidation and reduction reactions. c) What will be the change if silver rod is used instead of iron rod? What is the reason?

A(5,3)' is a point on a line parallel to 'x' axis. a) Write the coordinates of any other point on the same line. b) What is the distance of that (you have written) point from A?

You are given a solution of AgNO_3 , a solution of MgSO_4 , a Ag rod and a Mg ribbon. How can you arrange a Galvanic cell using these? Write down the reactions taking place at the cathode and the anode.