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The public must be educated to take the following preventive measures against AIDS. A disposable or new razor should be used at the hair dresser's Blood donors must be screened for HIV before they donate blood Only disposable needles and syringes should be used Safe sex must b..

Intensive investigation by scientists over the years led to the development of a mental model (the minuscule particles couldn't be actually seen at that time) known as 'dynamic particle model'. All matter is assumed to be made up of particles that are very small, which may be atoms, mole..

At the turn of the nineteenth century, about 30 elements were known. 50 years later by the 1850s, scientists had discovered sixty three chemical elements and the numbers kept increasin..

It makes the study of such a wide variety of organisms easy. It projects before us a good picture of all life forms at a glance. It helps us understand the interrelationship among different groups of organisms. It serves as a base for the development of other biological sciences..

Question 1 - Question: A scientist in CDRI, Lucknow developed an anti-cerebral malarial drug called A from a plant B. Identify A and B. Answer: A : Arteether B : Artemisia ann..

When scientists started exploring matter, they realised that matter can be divided into smaller and still smaller particles. What was the ultimate particle like? They discovered that the smallest particle of an element that maintains its chemical identity through all chemical and physica..

The Atom - When scientists started exploring matter, they realised that matter can be divided into smaller and still smaller particles. What was the ultimate particle like? They discovered that the smallest particle of an element that maintains its chemical identity through all chemica..

Question: The scientist who first carried out critical nuclear fission reactionis ______. 1. Otto Hahn 2. Enrico Fermi 3. Hans Bethe 4. Einstein Answer: ..

(geographic isolation) During allopatric speciation, a population splits into two geographically isolated allopatric populations. New speciation starts because populations are prevented from interbreeding. Scientists think that geographic isolation is a common way for the process of spec..

The cells that make up our body are so small that you could fit over 200 of them on the full stop at the end of this sentence Before we plunge into the chapter, here are some interesting facts about cells. Read on... The word cell is derived from the Latin word cellula which means a little ..