Fill in the following blanks with suitable words:
Heterotrophs depend on . . . . . . and other . . . . . . for food.

Represent the equation of photosynthesis. Explain the steps involved in photosynthesis. In which way are the steps of photosynthesis different in desert plants?

The diagram below shows the human alimentary canal. $1$, $2$, $3$ and $4$ are four different organs that are parts of the canal.
$(i)$ Which of the labelled parts represents the liver?
(ii) Which of the following will be adversely affected in Mr. Ayub's body if his pancreas is malfunctioning, given that the pancreas secretes the lipase enzyme?

Which region in the Venn diagram represents the conditions necessary to activate enzymes for seed germination?

List the steps for the preparation of a temporary mount of a leaf peel to observe stomata.

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?