Question

Which one of the following statements pertaining to plant structure is correct [AIIMS 2005]
A) Cork have no stomata, but lenticels carry out transpiration
B) Passage cells help in transfer of food from cortex to phloem
C) Sieve tube elements posses cytoplasm but not nuclei
D) The shoot apical meristem has a quiescent centre

Answer 1

Answer:

Option c is correct.

Explanation:

Sieve tube elements are alive at functional maturity, though they lack nucleus, ribosomes and distinct vacuoles. It's functions are regulated by companion cells through plasmodesmatal connections. The nucleus and ribosomes of companion cells serve for sieve tubes.

Rest of the options are wrong. .

Hope this helps.