Factors That Shape Plant Transport: My Experiments on Transpiration & Translocation - kssm form 5 biology

 Once I had processes down, I tested how environmental factors affect them. I varied:

• Light intensity: raised lamp wattage, saw bubble speed double
• Humidity: enclosed shoot in a damp chamber, transpiration halved
• Wind: directed a fan at the leaf, transpiration rate climbed

I also tracked sugar movement under low temperature, noting phloem flow slowed—validating that translocation depends on metabolic activity in companion cells.

Sample SPM Question

“Describe how light intensity and humidity influence transpiration rate in plants.”

I structured my answer:

• Light opens stomata, increasing transpiration.
• High humidity reduces water potential gradient, decreasing transpiration.