PLANTS
THE LEAF
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Midrib
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Stem
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Node
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Leaf base
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Detailed explanation-1: -There may be swollen regions at either end of the petiole known as pulvina (singular = pulvinus) that are composed of a flexible tissue that allows leaf movement. Pulvina are common in the bean family Fabaceae and the prayer plant family Marantaceae.
Detailed explanation-2: -The swollen part of the pedicel is known as thalamus.
Detailed explanation-3: -The swollen leaf base is called pulvinus. (A) Sheathing leaf base is found in monocotyledons. (B) In some leguminous plants the leaf base may become swollen, which is called the pulvinus.
Detailed explanation-4: -Such swollen leaf bases are called pulvinus leaf bases e.g., Mango, Pea, Gram, Ficus etc.
Detailed explanation-5: -In Eichhornia, swollen and spongy petiole provides air chambers and helps in buoyancy and mechanical support to plants.