Excretory Products And Their Elimination

Nephridia are excretory organs of earthworms. Three types of nephridia are found in earthworm according to their location, namely the septal nephridia, pharyngeal nephridia and integumentary nephridia. Earthworm excretes urea as well as ammonia as an excretory waste. So, it is known as ureotelic as well as ammoniotelic.

(antidiuretic hormone) is a hormone secreted by the posterior pituitary gland that stimulates reabsorption of water by the kidneys and thus, controls the concentration of body fluids.

Answer (a) Renin