Name the substances on which the following enzymes act in the human digestive system: $(i)$ $Trypsin$. (ii) $Amylase$. (iii) $Pepsin$. (iv) $Lipase$.

State the chemical equation for photosynthesis and identify the site where it occurs in plant cells.

How do carbohydrates,proteins,and fats get digested in human beings?

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.

Where are proteins first digested in the alimentary canal?

Name the following: Organisms that cannot prepare their own food.