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- #Class 11
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Phyllodes are seen in
Australian acacia
Cactus
Onion
Garlic
Answers (1)
Modification of Leaves -
a) Leaf tendrils: Leaves are modified into slender wiry and coiled structures called tendrils. The entire leaf or a part of it may be modified into tendril as follows:
- Terminal leaflets modified into tendril, e.g., Pisum sativum (Pea), Lathyrus odoratus (Sweet pea), Narvella.
- Entire leaf modified into tendril, e.g., Lathyrus aphaca (Wild pea).
- Leaf tip modified into tendril, e.g., Gloriosa.
- Petiole modified into tendril, e.g., Clematis.
- Stipule modified into tendril, e.g., Smilax.
- Midrib modified into tendril, e.g., Nepenthes.
b) Leaf Spine: It is a pointed structure formed either due to modification of entire leaf or some part of it. It serves the function of protection.
- In Opuntia leaves of axillary branches are modified into spines.
- In Berberis entire leaf is modified into three spines.
- In Parkinsonia, Acacia and Zizyphus stipules are modified into spines.
- In Citrus first leaf of axillary branch modified in to spine.
c) Fleshy leaves: These are seen in onion and garlic for the storage of food.
d) Phyllode: In Australian acacia, the leaves are short lives. The petioles of these plants expand, become green and synthesize food. Such petioles are called phyllode.
e) Trap leaves: The trap leaves are also called insectivorous leaves or carnivorous leaves. Plants having trap leaves usually grow in nitrogen-deficient soils (boggy soils). They have poorly developed root system. For example, pitcher plant and venus-fly trap.
- In Australian acacia, the leaves are short lives. The petioles of these plants expand, become green and synthesize food. Such petioles are called phyllode.
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