Name the following: An enzyme secreted by gastric glands in the stomach which acts on proteins.

Why are green plants called 'producers'?

Name three different glands associated with the digestive system in humans. Also name their secretions.

Explain the role of the mouth in the digestion of food.

Which is the internal energy reserve in plants? Do the animals have the same energy reserve?

Teeth break down large insoluble food particles into smaller soluble molecules. Which of the following statements are correct regarding this process?
$(1)$ It is a chemical digestion process.
$(2)$ It is a physical digestion process.
$(3)$ It increases the surface area of food for enzyme action.
$(4)$ It converts complex proteins directly into amino acids.