Ascariasis is a common helminthic disease caused by: MCQ with Answer and Explanation

Explanation:
The larynx, also called the voice box, contains vocal cords that vibrate as air passes, producing sound. It is located at the top of the trachea. The trachea (windpipe) conducts air; pharynx is the common passage for food and air; bronchi lead to lungs. The larynx is cartilaginous, and in males, the thyroid cartilage forms the Adam's apple.

Explanation:
Salivary amylase (ptyalin) hydrolyzes starch into maltose and dextrins, initiating carbohydrate digestion. The reason explains the presence of amylase in saliva.

Explanation:
Root hairs are unicellular extensions of epidermal cells found in the zone of maturation (differentiation) of the root, just behind the zone of elongation. They increase surface area for water and mineral absorption. The root cap protects the tip, the meristematic zone contains dividing cells, and the elongation zone causes root lengthening.