Question

The translocation of Organic solutes in sieve tube members is supported by :
A) Mass flow involving a carrier and ATP
B) Cytoplasmic streaming
C) Root pressure and transpiration pull
D) P-proteins

Answer 1

Hint:According to the mass flow hypothesis the transport of organic solutes takes place from source to sink, this transport also depends on metabolic energy.

Complete answer:
The pressure-flow mechanism of sugar translocation, dissolved sugar is translocated, bidirectionally in vascular tissue from supply to sink. In a very vascular tissue of supply, with sugar ATP, Active loading of companion cells square measure needed. To pump protons out of the vascular tissue components ATP provides energy. The resultant nucleon gradient drives the uptake of sugar by synchronal co-transport of protons back to the vascular tissue components. The accumulated sugar within the vascular tissue part causes the movement of water into the sieve tubes by diffusion.

b. Cytoplasmic streaming has been long conjectured to help in overcoming the slowness of diffusion on long length scales, however its precise role in enhancing metabolic rates is however to be elucidated. Over the last twenty years, our understanding of the molecular make-up and spatial organization of the cellular surroundings has exaggerated dramatically.

c. Root pressure is caused by the active distribution of mineral nutrient ions into the thought plant part. Root pressure exerts a force that pushes water up on the stem to a specific level. Transpiration pull is the force that aids in drawing the water upward from roots to leaves. The negative pressure created by transpiration pull exerts a force on the water particles inflicting their upward movement within the plant part.

d. P-proteins (Phloem proteins) area unit elements found in giant amounts in vascular tissue sieve tubes. The most operate of those bodies is to seal off the vascular tissue component or sieve cell by delivery regarding the blockage of the sieve plate. These bodies perform this operation when; the sieve component is cut. These bodies and callose along block the pores of vascular tissue parts. P-Protein bodies and callose from interference plugs. These bodies stay on the walls of vascular tissue parts.

Hence, option A: Mass flow involving a carrier and ATP is the correct answer.

Note: Munch's Mass Flow Hypothesis is that theory which explains the flow of food materials through the phloem from the upper concentration regions to lower concentration regions.