AP BIOLOGY

PHOTOSYNTHESIS

THE CALVIN CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What are C3 plants?
A
These plants are the best when it comes to storing water due to their extremely dry environments
B
These plants mostly just reduce the rate of photorespiration
C
plants that do the calvin cycle in the mesophyll cells
Explanation: 

Detailed explanation-1: -In C3 plants, a 3-carbon sugar is produced which can diffuse into mesophyll cells, and into the stroma of chloroplasts, where the Calvin cycle takes place. Hence, the site of C3 cycle or Calvin cycle in C3 plants is mesophyll cell and in C4 plants is bundle sheath cell.

Detailed explanation-2: -C4 plants have a unique leaf anatomy including two types of photosynthetic cells: bundle-sheath cells and mesophyll cells, where as C3 plants contain only mesophyll cells. In the C4 plants, the Calvin cycle occurs in the bundle-sheath cells (in C3 plants this occurs in the mesophyll cells).

Detailed explanation-3: -In the C3 plants, the first compound form is of 3 carbon (PGA) while in C4 plants the first compound is of 4 carbon (OAA). The Calvin cycle takes place in the mesophyll cells. The Calvin cycle takes place in the bundle sheath cells. The initial carboxylation reaction occurs in the mesophyll cells.

Detailed explanation-4: -The conversion of CO2 to carbohydrate is called Calvin Cycle or C3 cycle and is named after Melvin Calvin who discovered it. The plants that undergo the Calvin cycle for carbon fixation are known as C3 plants. Calvin Cycle requires the enzyme ribulose-1, 5-bisphosphate carboxylase/oxygenase commonly called RuBisCO.

Detailed explanation-5: -C3 plants include some of the most important sources of calories all over the world: cowpea, cassava, soybean, and rice. The regions where these crops are grown in are often hot and dry, meaning they could benefit from the energy-saving mechanisms of C4 photosynthesis.

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