Which of the following is used in water purification?

A. Reverse osmosis
B. Osmosis
C. Cytolysis
D. Turgor pressure

lightest metal is__________?

A. Lithium
B. Sodium
C. Magnesium
D. Aluminium

Which of the following pollutants in water causes “Minamata disease?

A. Methyl mercury
B. Lead
C. Salmonella
D. Perchlorate

The process of converting wet waste to manure is___________?

A. Metabolism
B. Conservation
C. Incineration
D. Composting

Which of the following organisms releases molecular oxygen into water?

A. E.coli
B. Phytoplankton
C. Amoeba
D. Salmonella

A colloidal system in which a liquid is dispersed into a liquid is called_________?

A. Percipitate
B. Gel
C. Emulsion
D. Sol

Which metal is pure conductor of electricity?

A. Copper
B. Gold
C. Silver
D. Lead

An example of rhizome is_________?

A. Carrot
B. Tomato
C. Ginger
D. Garlic

Which planet is called “red planet”?

A. Mars
B. Venus
C. Jupiter
D. Saturn

Which of these is a micronutrient of plants?

A. Oxygen
B. Nitrogen
C. Boron
D. Carbon