Plants get water from the soil through their roots while the process of photosynthesis takes place in the leaves.

So how does the water reach the leaves from the roots?

Let us recall the experiment done in the chapter “Plants: Parts and Function” of class VI, which showed how water is transported in the plant body.

On the basis of this experiment, what conclusion can you draw about the functions of the root and stem in the nutrition of plants?

Why is it necessary to irrigate the fields after sprinkling urea? Think it over and answer with reasons.

We know that plants take water through their roots and air through the stomata of their leaves (there are some other parts like loose tissues and lenticels present on the bark of plant through which exchange of air takes place). We also know that leaves contain the green substance, chlorophyll.

What else is needed for photosynthesis?

A part of the leaf is covered and the other half is boiled in water and decolourized, a drop of iodine was added to the part of the leaf which was covered and it turned bluish-black. Why did this happen?

4 to 5 leaves of the same plant were covered with the black paper without removing them from the plant. The way the black paper was cut and fixed to the leaves is shown in the figure. These leaves were plucked two days later. Their green color was removed, and they were dipped in iodine solution. The leaves turned black in the pattern shown in the figure.

Can you tell by looking at the figure whether starch is present.