If a baby is a female, her mother's ovum must have been fertilized by a sperm carry the chromosome

Leguminous plants, e.g Mucana, are usually planted in cultivated farmlands because they

During thunderstorms the energy of lightning discharge causes

A few grams of dried soil were first heated until red hot and then further heated until no more smoke was released. This experiment was to determine

Oxygen from the atmosphere reaches the mammalian blood stream through one of the path indicated below. Indicate the correct path, a = mouth, b = trachea, c = bronchiole, d = nostril, e = bronchus, f = alveoli