Question

Which one is a CAM plant?
(A) Maize
(B) Pineapple
(C) Onion
(D) Pea

Answer 1

Hint: Crassulacean acid metabolism which is also called as the CAM photosynthesis, is a carbon fixation pathway that advances in certain plants in order to adapt in the arid conditions. Since the desert plants have very less water for the metabolism, the CAM pathway is used.

Complete answer:
In a plant utilizing CAM, the stomata in the leaves stay shut during the day to decrease evapotranspiration for the reduction of the water loss. The stomatal pores open around evening time to gather carbon dioxide and permit it to diffuse into the mesophyll cells. The Carbon dioxide is put away as the four-carbon malic acid chain in vacuoles around evening time.

And in the daytime, the malate is moved to chloroplasts where it is changed over back to Carbon dioxide which is then utilized during photosynthesis. The pre-gathered Carbon dioxide is used for the making of the catalyst Rubisco, expanding photosynthetic effectiveness. This system of CAM was first found in quite a while of the family Crassulaceae. The example of the CAM plant is pine apple, orchids, cactus, jade plant etc.

Hence, the correct answer is option (B)

Note: The most significant advantage of CAM to the plant is the capacity to leave most leaf stomata shut during the day. This saves much of the water against evaporation. Plants utilizing CAM are generally basic in arid condition, where water comes at a higher cost than expected. This helps the plants to develop in conditions even in a very dry condition. But in case of the $C3$photosynthesis mechanism $97\% $ of water lost through the stomata.