The diagram shows the arrangement of cells inside the leaf of a green plant. (No cell contents are shown).

Which cells normally contain chloroplasts?

Reading about the digestive glands and their action, a student got confused about some facts. Given below are some questions, concerning the facts.

(i) Why cannot we digest raw green plants in our alimentary canal?

(ii) Why are digestive enzymes present in an inactive form in the body when we can require their action any time?

(iii) HCL is an acid which kills bacteria ingested with food, but does not harm the walls of stomach. Why?

(iv) What values do you think the student conveys from his questions?

In photosynthesis, which substances are used up, which are produced and which are necessary, but remain unchanged after the reaction?

Choose the forms in which most plants absorb nitrogen:

I. Proteins

II. Nitrates and nitrites

III. Urea

IV. Atmospheric nitrogen

Choose the correct option.

A plant is kept in the dark for two days. A leaf is used in an experiment to investigate the effect of two factors on photosynthesis as shown in the diagram.

What are the colours of Q and R, when the leaf is tested for starch, using iodine solution?