The given figure shows the ultrastructure of a plant cell.
Which of the following statements are correct for parts marked as P and Q.
(i) Part Q helps in osmoregulation.
(ii) Cellular respiration occurs in part P.
(iii) Part P is lined by single membrane.
(iv) Part Q is found only in plant cells.
A(i) and (ii)
B(i) and (iii)
C(iii) and (iv)
D(ii) and (iv)