How do Organisms Reproduce? — Science STD 10 — Question

What do you understand by the term “electric potential”? (or potential) at a point? What is the unit of electric potential?

What are the advantages of having two eyes instead of just one?

Why does absorption of digested food occur mainly in the small intestine?

Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.

Name the reagent which is able to dissolve gold and platinum.

Distinguish between tropic movements and nastic movements in plants. Give examples to illustrate your answer.

What will be the consequence of the absence of decomposers in the ecosystem?

What happens when an acid reacts with a metal? Give chemical equation of the reaction involved.

A communications satellite in orbit sends a parallel beam of signals down to earth. If these signals obey the same laws of reflection as light and are to be focussed onto a small receiving aerial, what should be the best shape of the metal 'dish' used to collect them?

Define and show on a diagram, the following terms relating to a concave mirror:

1. Aperture.
2. Radius of curvature.