Question

CAM plants are mainly

• A. Succulent xerophyte
• B. Hydrophytes
• C. Epiphyte
• D. None of the above

Answer 1

The correct option is A Succulent xerophyte

CAM plants are mainly succulent xerophytes. Besides C3 and C4 cycles, Crassulacean acid metabolism is a third mechanism for fixing carbon dioxide. It is found not only in members of the family Crassulaceae eg., Kalanchoe, Sedum, Crassula, but also in the members of family Cactaceae example Opuntia. Besides it also occurs in some members of Liliaceae, Orchidaceae, Bromeliaceae, Euphorbia sp and pteridophytes like Isoetes. In CAM plants the stomata are open at night and during day time the stomata remain close.

Therefore, the correct answer is option A.