P-2 Cell Biology and Biotechnology — Science STD 10 — Question

Take into account the time required for following processes. Classify them into two groups and give titles to the groups.
(1) Cooking gas starts burning on ignition.
(2) Iron article undergoes rusting.
(3) Erosion of rocks takes place to form soil.
(4) Alcohol is formed on mixing yeast in glucose solution under proper condition.
(5) Effervescence is formed on adding baking soda into a test tube containing dilute acid.
(6) A white precipitate is formed on adding dilute sulphuric acid to barium chloride solution.

Name the following:
An enzyme secreted by gastric glands in stomach which acts on proteins.

Which parts of the body form the central nervous system?

What substance/ substances are transported in plants by:

1. Xylem vessels and tracheids?
2. Sieve tubes (or phloem)?

Name one metal which displaces copper from copper sulphate solution and one which does not.

What do you mean by Latent heat of vapourization?

Which system is in action for removal of waste materials produced in human body?

Name one example of the movement of a plant part which is very quick and can be observed easily.

How does the valency of elements vary in going down a group of the periodic table?

Define linear magnification produced by a mirror.