A radio active element "X" with a halflife of 2 hours decay giving a stable element"Y". After a time of "t" hours the ratio of atoms is 1:7 then, the value of

The compounds formed when hydrogen combines with p-block elements are called

Among the following salts, which is a salt of weak acid and strong base

Choose the micronutrient needed for plant growth

The root nodules of Casuarina which are capable of symbiotic nitrogen fixation contain themicrobe

Which cytoplasmic organelle is associated with acrosome formation in the spermatozoa of animals?

Deficiency of folic acid leads to

A feature common to nucleus, chloroplast and mitochondria is the presence of

Hormone secreted in root tip during the formation of nodule is

Metabolically inactive cell inclusions remaining in the cytoplasm is called