P-2 Heredity and Evolution — Science STD 10 — Question

Ammonia reacts with oxygen to form nitrogen and water. Write a balanced chemical equation for this reaction. Add the state symbols for all the reactants and products.

What do you think will be the pH in the stomach of a person suffering from indigestion: less than 7 or more than 7?

Name the raw material used for the preparation of plaster of Paris.

Where is the male gamete formed:

1. In humans?
2. In flowering plants?

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.

Why is small intestine in herbivores longer than in carnivores?

How is the concentration of hydronium ions (H O ) affected when the solution of an acid is diluted?

What is principal focus?

Write the functions of the following: Sporangium.

Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic?