Question

Fig. represents the vertical section of a leaf.

1. Name the parts labelled 1 to 5.
2. What do the two arrows (dotted and solid) indicate in the daytime and at night?
3. Could you add one more arrow in the figure? If yes, what for?

Answer 1

1. 1. Upper Epidermis
   2. Palisade layer/chloroplast
   3. Xylem
   4. Phloem
   5. Guard cell
2.  The two arrows show the release of oxygen and water vapours during the daytime and carbon dioxide and very less amount of oxygen is released during the night.
3. Yes, one more arrow can be added to show the absorption of carbon dioxide by the leaf.