The translocation of organic solutes in sleve tube membres is supportted by

Options

A. P-proteins
B. mass flow incolving a carrier and ATP
C. cytoplasmic streaming
D. root pressure and transpiration pull

Answer

B

Explanation

According to mass flow hyportesis the transport of organic solutes takes place from source of sink, this transport also depends on metabolic energy.
According to cytoplasmic streaming hypothesis (which was given by de Vries, 1885) the transport or organic solutes takes place by combination of diffusion and cytoplasmic streaming. Cytoplasmic stremaing carry organic solutes from one and to the other end of sieve tube. P-proteisn has a role as defence against phloem feeding inscts and sealing of damaged sieve tubes.