What are moderators?

Which material is used as a neutron moderator-

Substance used as a moderator in nuclear reactor is-

A substance used as a moderator in nuclear reactors is

Give an example of a moderator used in nuclear reactor.

Which allotrope of carbon is used as a moderator in the nuclear reactor?

In a nuclear reactor , moderators slow down the neutrons which come out in a fission process. The moderator used have light nuclei. Heavy nuclei will not serve the purpose because,

An isotope of hydrogen reacts with oxygen to give compound (A), which is used as a moderator in nuclear reactor. Like hydrogen, this isotope also undergoes addition reaction. It reacts with ethylene to give compound B, which is a saturated hydrocarbon. Identify the element A and B. A is radioactive.

What are spermatheca? Where they are situated? What is the function of spermatheca?

What is micropropagation ? What are the characteristics and advantages of micropropagation ?

What is Ogive? What are its uses?