Question

Plants which show both calvin and Hatch slack pathways are :

• A. $C_3$ plants
• B. $C_4$ plants
• C. Both $C_3$ and $C_4$
• D. Both $C_3$ and $CAM$ plants

Answer 1

Answer: (B)

$C_4$ plants

C${}_4$ pathway is the alternate pathway of C${}_4$ cycle to fix CO${}_2$. In this cycle, the first formed stable compound is a 4 carbon compound ( oxaloacetic acid ). Hence it is called C${}_4$ cycle. The path way is also called as Hatch and Slack as they worked out the pathway in 1966 and it is also called as C${}_4$ dicarboxylic acid pathway.

In C${}_4$ plants, the light-dependent reactions and the Calvin cycle are physically separated, with the light-dependent reactions occurring in the mesophyll cells (spongy tissue in the middle of the leaf) and the Calvin cycle occurring in special cells around the leaf veins. These cells are called bundle-sheath cells.

So, the correct option is 'C${}_4$ plants'.