Introduction to Biotechnology — Science STD 9 — Question

Explain the water of Crystallization.

What is universal indicator? Which is the most accurate method of measuring the pH of a solution?

Using the chart of ions/radicals and the cross-multiplication method, write the chemical formulae of the following compounds : Calcium carbonate, Sodium bicarbonate, Silver chloride, Calcium hydroxide, Magnesium oxide, Ammonium phosphate, Cuprous bromide, Copper sulphate, Potassium nitrate, Sodium dichromate.

Explain the meaning of biotechnology and its impact on agricultural management with suitable examples.

Anodizing.

Explain with the help of a neat labelled diagram the working of human ear.

Oxygen cycle


1. Is oxygen gas freely available in the atmosphere?
2.How is oxygen used by animals?
3.How are we using carbon as a fuel?
4.How to plants use carbon as their food source?
5.How do animals use carbon?
6.Which type of bio-geo-chemical cycles does carbon follow?

Write short note : Reflex action

In which of the solvents – water, kerosene and cooking oil does the coal powder dissolve?

Complete the following table of the concentration of various aqueous solutions.