Phloem transport is expected to remain fairly constant during diurnal cycles (da
ID: 205460 • Letter: P
Question
Phloem transport is expected to remain fairly constant during diurnal cycles (day/night cycles) because
The statement is false: Sucrose is only transported during the day when it is created by photosynthesis
Sucrose is always abundant in leaf cells
Sucrose and starch are produced during the day, and starch is converted to sucrose at night
Starch, the main product of photosynthesis, is degrade more slowly than it is synthesized to provide a constant supply of sucrose
The oxidative pentose phosphate pathway oxidizes glucose to provide substrates to make sucrose
a.The statement is false: Sucrose is only transported during the day when it is created by photosynthesis
b.Sucrose is always abundant in leaf cells
c.Sucrose and starch are produced during the day, and starch is converted to sucrose at night
d.Starch, the main product of photosynthesis, is degrade more slowly than it is synthesized to provide a constant supply of sucrose
e.The oxidative pentose phosphate pathway oxidizes glucose to provide substrates to make sucrose
Explanation / Answer
Answer: Option C is correct.
Explanation:
Production and phloem transport of sucrose are maintained relatively constant throughout the diurnal cycle.
The carbon source for sucrose synthesis in light is the newly fixed carbon in photosynthesis.
During the night, sucrose is produced from starch.