Which organelle acts as the site of photosynthesis?

Generally, food is broken down and absorbed within the body of organisms. In which of the following organisms does this process occur outside the body?

Which of the following organisms exhibits a parasitic mode of nutrition?

Name the five steps which occur in the process of nutrition in animals.

Where do plants get each of the raw materials required for photosynthesis?

$X$ is a wild animal which eats only the flesh of other animals, whereas $Y$ is a domestic animal which feeds mainly on green grass. $(a)$ What are animals like $X$ known as? $(b)$ What are animals like $Y$ known as? $(c)$ Which animal, $X$ or $Y$, has a longer small intestine? Why? $(d)$ Name one animal which is like $X$. $(e)$ Name one animal which is like $Y$.