Practice Questions

TLS Online TPP Program

#Question id: 14900

polymer-trapping model explains symplastic loading in plants, This model states that the sucrose diffussion takes place through cell to cell via plasmodesmata; which of the following prediction about the diffusion mechanism is INCORRECT?

#Unit 6. System Physiology – Plant

Sucrose, synthesized in the mesophyll, diffuses from the bundle sheath cells into the intermediary cells through the abundant plasmodesmata
In the intermediary cells, raffinose is synthesized from sucrose and galactinol, Because of its smaller size, raffinose is able to diffuse back into the mesophyll
Plasmodesmata between the intermediary cells and sieve elements must be wider and allow passage of raffinose and stachyose
Raffinose is able to diffuse into the sieve elements. As a result, the concentration of transport sugar rises in the intermediary cells and the sieve elements.