Question

Which one of the following is a CAM plant?
A. Maize
B. Kalanchoe
C. Sugarcane
D. Jowar

Answer 1

Hint: The characteristic feature of CAM plants is that they can fix carbon dioxide during the night but form sugars only during the day when RuBisCO is active. Examples of CAM plants include Sedum, Kalanchoe, Pineapple, Opuntia, Snake plant, etc. CAM plants also perform double carbon dioxide fixation. The carbon dioxide acceptor in CAM plants is Phosphoenol pyruvic acid (PEP) during the night and Ribulose bisphosphate during the daytime. The first stable product produced in the case of CAM plants is Oxalo acetic acid (OAA).

Complete answer:
Option A- Maize
Maize is also known as corn. It is a cereal grain that was first domesticated by indigenous peoples in southern Mexico about 10,000 years ago.

Option B- Kalanchoe
Kalanchoe pronounced as Kal-un-KOH-ee, or Kal-un-kee, and also written as Kalanchöe or Kalanchoë. It belongs to a genus of about 125 species of tropical, succulent flowering plants from the family Crassulaceae.

Option C- Sugarcane
Sugarcane or sugar cane refer to various species and hybrids of tall perennial grasses belonging to the genus Saccharum, tribe Andropogoneae. They are used for sugar production.

Option D- Jowar
Sorghum is a genus of flowering plants belonging to the grass family Poaceae. It includes about 25 species. Some of these species are grown as cereals for human consumption and some in pastures for animals.

So, the correct option is B- Kalanchoe.

Note: CAM plants can be defined as certain plants that have Crassulacean Acid Metabolism (CAM). They are known to have photoactive stomata. Scotoactive stomata are the stomata that remain open during the night.