Fill in the following blank with a suitable word:
All non-green plants and animals are . . . . . . .

What are the functions of gastric glands present in the wall of the stomach?

Name the glands associated with the digestion of starch in the human digestive tract and mention their role. How is the required $pH$ maintained in the stomach and small intestine?

The process of obtaining food by $Amoeba$ is known as:

Oxygen liberated during photosynthesis comes from

Describe one way in which the small intestine is adapted for the absorption of digested food.