Which of the following areas is hardest hit by drought and food shortage in Africa?

(d) Biomagnification is the phenomenon of increasing concentration of compound in the tissue of organism, as the compound passes up a food chain, usually as a result of food intake....

The answer is (D) Kenya & Tanzania

(b) The dead organic matter of plant or animal is called as detritus. While a part of it remains on the soil surface as litter, the other part enters the...

The Right option is :(a) 1 and 2 

(i) X- Carbon, Y - Diamond, Z - Graphite (ii) Non-metal (iii) Tin.

(i) X - Carbon, Y - Diamond, Z - Graphite (ii)Non-metal (iii)Tin.

X is carbon (non-metal). X exists in the form of allotropes, Y is diamond and Z is Graphite.

When the pH in the mouth is below 5.5, bacteria present in the mouth produce acids by degradation of sugar and corrode the tooth enamel. It can be prevented by...

Tooth enamel is made up of compound calcium phosphate. Its pH is 5.5. Bacteria present in the mouth works on the leftover food particles and produce acid. Tooth pastes are used...

"Each term every child has one blind day, one lame day, one deaf day, one injured day and one dumb day." The blind day was the hardest because the children...