The number of chromosomes in a human zygote is: MCQ with Answer and Explanation

Explanation:
Adventitious roots arise from stem, leaf, or other non-root tissues, unlike taproots and fibrous roots that develop from the radicle. Examples: prop roots of banyan, stilt roots of maize, aerial roots of orchids. They can serve support, aeration, or additional absorption.

Explanation:
Growth hormone (somatotropin) is produced by the anterior pituitary. It promotes growth of bones, muscles, and other tissues. Deficiency causes dwarfism; excess causes gigantism or acromegaly.

Explanation:
Beriberi involves neurological and cardiovascular symptoms due to thiamine deficiency, common in polished rice diets. Scurvy is vitamin C, pellagra niacin, rickets D.