Question

The $C_{4}$ plants differ from $C_{3}$ plants with reference to the

• A. substrate that accepts $CO_{2}$ in carbon assimilation
• B. type of end product
• C. type of pigment involved in photosynthesis
• D. number of ATP that are consumed in preparing sugar

Answer 1

Answer: (A)

substrate that accepts $CO_{2}$ in carbon assimilation

Answer 2

Plants that utilise primarily RuBP to fix $CO _{2}$, which results in the formation of a $3$ carbon compound $(3 PGA)$ are called $C _{3}$ plants. Hatch and Slack proposed a new pathway in plants for $CO _{2}$ fixation via the carboxylation of PEP (phosphoenol pyruvate). Because the products are $4$ carbon compound, the plants are known as $C _{4}$ plants.