How does the ringing experiment work and what does it prove ?
Remove tissue
Upper half will swell, they are high in sugars
Area below dies
Helps conclude that sugars in the phloem cause the swelling and the bottom dies as it’s receiving no sugars s phloem must be responsible for the movement of sugars
How does the tracer experiment work and what does it prove ?
plants grow in conditions with radioactive carbon dioxide
incorporated into sugars during photosynthesis
can be traced as they move around plant
blackened areas shown on x-ray film contain sugars and CO2, shown are phloem
