Same chapter3 marksDifficulty: Medium
What is guttation, and how does it differ from transpiration?
Transpiration
3 marksDifficulty: Medium
Describe an experiment to demonstrate that transpiration takes place through the leaves of a plant.
Original Khojo Papers practice question — not from a past board paper.
Answer
Enclose the leafy shoot of a well-watered potted plant in a dry transparent polythene bag and tie it at the stem. Cover the pot and soil with another sheet so that evaporation from the soil is excluded. Keep the plant in sunlight for a few hours. Droplets of water collect on the inner surface of the bag, showing that water vapour has been given off by the leaves. A similar set-up with a de-leafed shoot acts as the control and shows no droplets.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The control rules out evaporation from the soil and stem as the source of the water.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
Why does a freshly transplanted sapling wilt, and how can this be prevented?
Transpiration
Same chapter3 marksDifficulty: Medium
State four factors that affect the rate of transpiration and the effect of each.
Transpiration
Same chapter3 marksDifficulty: Medium
Explain the mechanism by which a stoma opens.
Transpiration
Same chapter3 marksDifficulty: Medium
State the significance of transpiration to a plant.
Transpiration
Same chapter3 marksDifficulty: Medium
Describe an experiment to show that transpiration takes place mainly through the stomata on the lower surface of a leaf.
Transpiration