Life Processes — Science STD 10 — Question

Name any two plants which are usually propagated by the cuttings method.

To construct ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror. List these two rays and state the path of these rays after reflection. Use these rays to locate the image of an object placed between centres of curvature and focus of a concave mirror.

Name and state the rule to determine the direction of magnetic field around a straight current-oar- ing conductor.

Give two examples each of organic acids and mineral acids.

We often observe domestic waste decomposing in the bylanes of residential colonies. Suggest ways to make people realise that the improper disposal of waste is harmful to the environment.

Define "Saprophytic nutrition" Give one example of each type.

Although coal and petroleum are produced by the degradation of biomass, even then we need to conserve them. Why?

Write a balanced chemical equation for the process of photosynthesis giving the physical states of all the substances involved and the conditions of the reaction.

Name the energy currency in the living organisms. When and where is it produced?

Water in deep sea is blue in colour. Why?