Reaching the age of adolescence. — Science STD 8 — Question

Name the device which is attached to heavy luggage (such as a heavy suitcase) to move it easily by pulling.

Two tiny holes are made in a plastic bucket, one near the middle part and the other just above bottom when this bucket is filled with water, the water rushes out from the bottom hole much faster than from the upper hole. What conclusion do you get from this observation?

Name the form of polyester which is replacing materials like glass and used for making bottles and jars.

Name the metal which is usually electroplated on car parts such as bumpers and bicycle handlebars made of steel.

Name the hormone which prepares our body for action to face emergency situation like danger, fear, anger or excitement.

Which life process ensures that a plant of animal species will not disappear from the earth?

Name the process of the fusion of gametes?

On what factor does the loudness of a sound depend?

Name any two types of chemicals used in agriculture which cause water pollution.

Name the implement used in sowing.