Discussion
The swollen base of a petiole is known as
Answer: C
The swollen base of a petiole is the Pulvinus.
A pulvinus is a cushion-like swelling at the base of a petiole (or leaflet stalk), made of thin-walled motor cells. Changes in their turgor move the leaf, as in the sleep movements of legumes and the rapid folding of Mimosa pudica.
A ligule is a thin membranous outgrowth where the leaf sheath meets the blade in grasses. A hastula is a small projection at the junction of the petiole and blade in some palms. Stipules are the paired outgrowths at the base of a leaf, beside the petiole rather than a swelling of it.
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