Which of the following is absent in the primary and secondary structure fo stem of Pinus

Options

A. Sieve tubes
B. Mucilage duct
C. Companion cells
D. Phloem parenchyma

Answer

C

Explanation

Companion cells are the specialized parenchyma-four cell. Associated with sieve tube elements due to which they are called companion cells. In contrast to sieve tube elements the companion cell retain a nucleus through out their life