Which one of the following is a xerophytic plant in which the stem is modified into the flat green and succulent structure?
- Opuntia
- Casuarina
- Hydrilla
- Acacia
Answer
(1) Opuntia
Solution
As per NCERT, some plants of arid regions modify their stems into flattened ( Opuntia) or fleshy cylindrical ( Euphorbia) structures; they contain chlorophyll and carry out photosynthesis.
⇒ Such a flat, green, succulent stem is a phylloclade, seen in the xerophyte Opuntia.
∵ Hydrilla is a hydrophyte, and Casuarina and Acacia do not have flat succulent stems,
∴ the plant is Opuntia.
Answer: (1)