Anil looks at a leaf of a gram plant. The flat green part with a thick middle vein…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Anil looks at a leaf of a gram plant.
- The flat green part with a thick middle vein.
- The thick middle vein.
- The stalk that holds the flat part out from the stem.
- The part where the leaf joins the stem, which is swollen in some legumes.
- Two small leaf-like parts at the leaf base.
Name each part.
Need a reminder? The key ideaShow
A leaf has a leaf base, a petiole and a lamina with a midrib and veins. Venation is reticulate (dicots) or parallel (monocots). A simple leaf is cut, if at all, short of the midrib. A compound leaf is cut to the midrib into leaflets, pinnate on a rachis (neem) or palmate from the tip of the petiole (silk cotton). Phyllotaxy is alternate, opposite or whorled. Leaves change for climbing (pea), defence (cactus), storage (onion) and trapping insects (pitcher plant).
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The lamina, or leaf blade.
Step 2. (b) The midrib.
Step 3. (c) The petiole.
Step 4. (d) The leaf base. When swollen, it is called the pulvinus.
Step 5. (e) The stipules.
Answer: (a) lamina; (b) midrib; (c) petiole; (d) leaf base, the pulvinus; (e) stipules.
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