Question 3
What are the main excretory products of animals?
The right answer is the one marked above.
Urea, salts, carbon dioxide and water. In a human being the nitrogenous excretory process happens mainly through the kidneys.
Glucose and oxygen are products of photosynthesis. Proteins, fats and carbohydrates are nutrients — they are used, not excreted. Chlorophyll is a plant pigment.