Q5 of 40 Page 164

The diagram represents a section through the small intestine.


What is the role of the structure labelled X?

The presence of villi and microvillus in the inner lining of small intestine increases the surface area for absorption. They allow more area for the enzymes to work efficiently.

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3

Choose the forms in which most plants absorb nitrogen:

I. Proteins


II. Nitrates and nitrites


III. Urea


IV. Atmospheric nitrogen


Choose the correct option.

 4

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?


 6

When a person eats some egg white, proteins and water enter the stomach. Which substances are found leaving the stomach and leaving the small intestine?

 7

In which order do these events occur in human nutrition?