Which useful material is derived form the bark of Cinchona plant?

Bernoulli's equation is derived form the principle of conservation of __________.

Which material is used for making electromagnet and why?

In which ways use of plastic materials is harmful for environment and society?

Define hallucinogens. Which hallucinogens are derived from the hemp plants?

IAA is derived from or which of the following is involved in the synthesis of a plant hormone IAA and V association serotonin?