#Question id: 10910
#Unit 6. System Physiology – Plant
In early research on phloem translocation, both active and passive mechanisms were considered. All theories, both active and passive, assume an energy requirement in both sources and sinks. What will be the INCORRECT explanation of active and passive mechanism?
#Question id: 10911
#Unit 6. System Physiology – Plant
Researchers have investigated bidirectional transport by applying two different radiotracers to two source leaves, one above the other. Researcher wanted to see how bidirectional transport happens in sieve elements. Which one of the following is INCORRECT interpretation for bidirectional transport?
#Question id: 10912
#Unit 6. System Physiology – Plant
Velocities for transport in the phloem are measured by using a technique which detect water flow;
#Question id: 10913
#Unit 6. System Physiology – Plant
Several transport steps are involved in the movement of photosynthate from the mesophyll chloroplasts to the sieve elements of mature leaves; The following steps are invoved with sucrose transportation is given;
a) During the day, triose phosphate is transported from the chloroplast to the cytosol, where it is converted to sucrose.
b) During the night, carbon from stored starch exits the cytosol primarily in the form of maltose and is converted to sucrose
c) Sucrose moves from the mesophyll cells to the sieve elements in the smallest veins of the leaf. This is called short-distance transport pathway
d) With respect to unloading, sucrose and other solutes are translocated away from the source through the vascular system to the sink is referred to as long-distance transport
Which of the following combination is correct?
#Question id: 10914
#Unit 6. System Physiology – Plant
Early research on phloem loading focused on the apoplastic pathway, probably because it is very common in
#Question id: 10915
#Unit 6. System Physiology – Plant
Pathways for phloem unloading and short distance transport. The sieve element–companion cell complex (SE–CC) is considered a single functional unit. The presence of plasmodesmata is assumed to provide functional_______Y_______. An absence of plasmodesmata between cells indicates an______Z________.