$A$ few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains:

Why is the small intestine in herbivores longer than in carnivores?

In which part of the digestive system is water absorbed?

Complete the following table:

Name of the gland	Name of hormone	Function
$(i)$ Thyroid	...................	Regulates metabolism of fat,protein and carbohydrates
$(ii)$ ...................	Insulin	Regulates blood sugar level
$(iii)$ Pituitary	...................	...................

Give reasons for the following:
$(a)$ Rings of cartilage are present in the trachea.
$(b)$ Mucus is secreted along with $HCl$ in the stomach.

$(a)$ Bile does not contain any digestive enzyme,yet it is important for the digestion of food. Why?
$(b)$ Name the products formed after the complete digestion of carbohydrates,proteins,and fats in the small intestine.