Which of the following is a nitrogenous fertilizer? MCQ with Answer and Explanation

Explanation:
Tritium (³H) is a radioactive isotope with a half-life of ~12.3 years, decaying by beta emission to ³He. Protium (¹H) and deuterium (²H) are stable. Tritium is used in self-luminous paints, tracer studies, and nuclear fusion. It occurs naturally in very small amounts from cosmic rays but is mainly produced in nuclear reactors.

Explanation:
Galvanization is coating iron or steel with a thin layer of zinc to prevent rusting. Zinc acts as a sacrificial anode—it corrodes preferentially (being more reactive) even if the coating is scratched, protecting the underlying iron. Tin coating (tin plating) protects only if the layer is intact. Chromium plating provides a shiny surface and corrosion resistance but works differently. Galvanized iron is used for roofing sheets, buckets, etc.

Explanation:
Enzymes are proteins with complex three-dimensional structures maintained by hydrogen bonds, ionic bonds, and hydrophobic interactions. Extremes of pH or high temperature disrupt these bonds, causing denaturation (loss of structure and function). Each enzyme has an optimum pH and temperature. For example, pepsin works in acidic stomach, trypsin in alkaline intestine.