Exploring the Investigative World of Science — Science STD 8 — Question

Name two non-metals which are used in fireworks (crackers, etc.)

Name the units of which cellulose polymer is made.

Fill in the blanks with the help of words given in bracket after each sentence. Water which looks clean still has disease carrying ________ and ________ impurities. (insects, microorganism, particles, dissolved, harmful).

Explain why, fire caused by electricity should not be extinguished by pouring water.

In which sort of reproduction are gametes fuse?

What is acne?

Name the Organ which produce male gametes.

Explain the reason of not putting the sharp or pointed things into the ear.

Name the disease caused by the insufficient production of insulin hormone by pancreas.

Name the star which remains fixed at the same place in the sky in the North.