Question

Sorghum and sugarcane plants show saturation at about

• A. 400 $\mu {\mathrm{l/L}}^{}$ of ${\mathrm{CO}}_2$
• B. 450 $\mu {\mathrm{l/L}}^{}$ of ${\mathrm{CO}}_2$
• C. 360 $\mu {\mathrm{l/L}}^{}$ of ${\mathrm{CO}}_2$
• D. 500 $\mu {\mathrm{l/L}}^{}$ of ${\mathrm{CO}}_2$

Answer 1

The correct option is C 360 $\mu {\mathrm{l/L}}^{}$ of ${\mathrm{CO}}_2$

Both sugarcane and sorghum are C4 plants. C4 plants show saturation at about 360 $\mu {\mathrm{l/L}}^{}$ while C3 responds to increased ${\mathrm{CO}}_2$ concentration and saturation is seen only beyond 450 $\mu {\mathrm{l/L}}^{}$.