IB Biology SL B3.1.9 Transpiration Questions
Explore how humidity, temperature, light and wind change evaporation, stomatal diffusion and water loss from leaves in IB Biology SL B3.1.9.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain how humidity, temperature, wind and light alter transpiration rate and leaf water loss.
IB Biology SL B3.1.9 Transpiration Questions question 1
[Maximum number: 4]
Water is one of the most abundant molecules on Earth. Living organisms must maintain homeostatic levels of water to survive.
Outline how environmental factors affect the rate of transpiration in plants.
a. transpiration is the evaporation of water from the stomata/openings of the plant leaf;
b. increase in humidity will decrease water loss/transpiration;
c. increase in temperature will increase water loss/transpiration;
d. increase in wind/ air movement will increase water loss/transpiration;
e. increase in light intensity will increase water loss/transpiration;
f. lack of water in soil causes stomates to close/transpiration to decrease;
Marking guidance:
Accept vice versa for these
statements
4 max
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