Mineral NutritionHard
Question
The translocation of organic solutes in sieve tub members is supported by
Options
A.P-proteins
B.mass flow involving a carrier and ATP
C.cytoplasmic streaming
D.root pressure and teanspiration pull
Solution
According to mass fiow hypothesis the transport of organic solutes takes place from source to sink, this transport is also depends on metabolic energy.
According to cytoplasmic streaming hypothesis (put forward by de Vries ; 1885) the transport of organic solutes takes place by combination of diffusion and cytoplasmic streaming. Cytoplas mic streaming carry organic solutes from one end to the other end of sieve tube. P-proteins has a role as defence against phloem feeding insects and sealing of damaged sieve tubes.
According to cytoplasmic streaming hypothesis (put forward by de Vries ; 1885) the transport of organic solutes takes place by combination of diffusion and cytoplasmic streaming. Cytoplas mic streaming carry organic solutes from one end to the other end of sieve tube. P-proteins has a role as defence against phloem feeding insects and sealing of damaged sieve tubes.
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