Identify the mode of nutrition where sunlight is used along with $CO_2$ and water to prepare food.

What substances are contained in gastric juice? What are their functions?

The enzyme which converts starch into glucose is:
$(A)$ Zymase
$(B)$ Maltase
$(C)$ Diastase
$(D)$ Invertase

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?

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

In the following questions, a statement of Assertion is given followed by a corresponding statement of Reason. Mark the correct answer as:
Assertion: Leaves are the major photosynthetic organs of a plant.
Reason: They contain chloroplasts.