Crop Production and Management — Science STD 8 — Question

Name one disease which spreads through infected food or water.

X is the reproductive cell produced in a woman's Y while Z is the reproductive cell that is produced in the testes of a man. What can X, Y and Z be ?

Which produces sound of a higher pitch: a drum or a whistle?

Name a natural balanced food for infants.

Name the characteristic of sound which enables us to distinguish between a man's voice and a woman's voice even without seeing them.

An element forms an oxide which is acidic in nature. Is the element a metal or a non-metal?

Define the calorific value of a fuel.

Name the gas evolved when a metal reacts with water.

What kind of force is an electrostatic force?

Fill in the blanks. The black thick liquid with ________ smell is known as coal tar.