Conservation of Plants and Animals — Science STD 8 — Question

Microorganisms are considered as friends and enemies of human being.

Why does it matter if a species go extinct?

Phosphorus is kept in water.

Iron girders used in the bridges are coated with zinc.

charged glass rod attract a charged plastic straw.

Changes occuring in adolescent boys and girls are different.

Water should be boiled and then used during an epidemic.

John and Radha were classmates since childhood. When Radha became eleven years old, she developed a little swelling on her neck. She visited the doctor who started medication for her. After a few years, John also developed a slight protrusion on his throat. He got worried and went to the doctor. But, the doctor assured him that it was a normal feature in boys while they are growing up. Can you think of any reasons for the difference in diagnoses?

The sex chromosomes of the father determine the sex of an unborn baby.

Water is not used to control fires involving electrical equipment.