Question

Which of the following characteristics are exhibited by C4C4 plants?
I. Kranz anatomy.
II. The first product of photosynthesis is oxaloacetic acid.
III. Both PEP carboxylase and ribulose biphosphate carboxylase acts as carboxylating enzymes.
The correct option is

• A. I and III, but not ll.
• B. I, II and III.
• C. II and III, but not I.
• D. ll and III.

Answer 1

Answer: (B)

I, II and III.

$C_4$ -plants have an alternative $C{O}_2$ fixation pathway, called as Hatch and Slack cycle. These plants have Kranz anatomy in leaf, where vascular bundles are surrounded by bundle sheath.

In $C_4$ cycle light reaction occurs in, mesophyll chloroplast by PEP carboxylaes and the assimilation of $C{O}_2$ takes place in, i.e., dark phase in bundle sheath chloroplast by Rubisco.