A) Aerenchyma
B) Collenchyma
C) Stomata
D) Root system
Correct Answer: A
Solution :
The cortex of hydrophytes is well developed, thin walled and parenchymatous. Major portion of it is occupied by well-developed prominents air cavity called aerenchyma, which increase buoyancy and allows a rapid gaseous exchange. Stomata are completely absent in submerged leaves (Potamogeton) or confined to upper surface of leaf (Nymphea). Collenchyma and root system are either absent or poorly developed. Roots are absent in Woffia, Salvinia and poorly developed in Hydrilla.
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