Leaf arrangement and internal structure
Answers are for parents and teachers.
1
Identify the leaf arrangement of 5 plants and tabulate it.
E.g. apple — alternate; basil — opposite; oleander — whorled.
2
Draw a leaf cross-section and name 6 parts.
Upper epidermis, palisade and spongy mesophyll, vein, stoma, lower epidermis.
3
Keep a houseplant in the same spot by the window for a week and watch the direction of its leaves. What changed?
The leaves turn towards the light.
4
One stoma has 2 guard cells. How many guard cells are there in 15 stomata?
30
5
Why is the underside of a leaf often paler than the upper side? Write 2–3 sentences.
The upper layer has dense, elongated, chloroplast-rich cells; the lower layer has loosely packed cells with fewer chloroplasts.