Reproduction in animals — Science STD 8 — Question

What should be done to decompose water into hydrogen and oxygen?

What is the special name of the period of life between childhood and adulthood?

Name the gas evolved when a metal reacts with water.

Which synthetic fibre contains the organic group similar to those which give fruits their sweet smell?

Write the full form of LED.

Name one ‘biological nitrogen-fixer’.

A nine-year-old boy is 120 cm tall. If the present height of boy is 75% of his full height, calculate the full height which the boy will eventually reach at the end of growth period.

Name the microbe which causes malaria disease.

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

Name the insect which is the carrier of parasite of malaria.