Question

Which of the following statements are true?

(a) In $C_4$ plants, primary $C{O}_2$ acceptor is PEP.
(b) PS II absorbs energy at or just below 680 nm.
(c) PS I has $P_{683}$.

• A. a and c
• B. a
• C. a and b
• D. c

Answer 1

Answer: (C)

a and b

A) The primary carbon dioxide acceptor in a $C_4$ plant is phosphoenol pyruvic acid(PEP). It contains 3 carbon atoms. PS I absorbs the wavelength of 700 nm so it has $P_{700}$. Statement 'a' is correct while statement 'c' is wrong.

B) PS II absorbs light of wavelength up to 680 nm. Both statements 'a' and 'b' are correct.
C) Both statements 'a' and 'b' are correct.

D) Statement 'c' is wrong.

So the correct answer is 'a and b'.