1. What is transpiration in plants?
A. Absorption of water from the soil
B. Loss of water as vapor from aerial parts
C. Conversion of water into nutrients
D. Movement of nutrients in phloem
Answer: B. Loss of water as vapor from aerial parts
2. Which part of the plant primarily facilitates transpiration?
A. Roots
B. Stomata
C. Xylem
D. Phloem
Answer: B. Stomata
3. Transpiration mainly occurs during which time?
A. Night
B. Daytime
C. Both day and night equally
D. Only at dawn
Answer: B. Daytime
4. What is the primary driving force for water movement in transpiration?
A. Gravity
B. Osmosis
C. Cohesion-Tension
D. Active Transport
Answer: C. Cohesion-Tension
5. Which of the following is NOT a type of transpiration?
A. Stomatal
B. Cuticular
C. Lenticular
D. Osmotic
Answer: D. Osmotic
6. What is the function of guard cells in transpiration?
A. Absorb water from soil
B. Regulate stomatal opening and closing
C. Conduct photosynthesis
D. Protect xylem tissues
Answer: B. Regulate stomatal opening and closing
7. Transpiration helps in which of the following processes?
A. Sugar transport
B. Water movement
C. Nitrogen fixation
D. Respiration
Answer: B. Water movement
8. Which hormone reduces transpiration in plants?
A. Auxin
B. Gibberellin
C. Abscisic Acid
D. Cytokinin
Answer: C. Abscisic Acid
9. Water movement in xylem is driven by which force?
A. Root pressure
B. Transpirational pull
C. Capillary action
D. All of the above
Answer: D. All of the above
10. What is the role of transpiration in mineral transport?
A. Prevents mineral loss
B. Increases mineral uptake
C. Moves minerals to leaves
D. Dilutes minerals in soil
Answer: C. Moves minerals to leaves
11. Which environmental factor decreases transpiration rate?
A. Low humidity
B. High wind speed
C. Low temperature
D. High light intensity
Answer: C. Low temperature
12. The cuticle on leaves reduces transpiration by:
A. Absorbing sunlight
B. Preventing water loss
C. Enhancing CO2 absorption
D. Increasing root pressure
Answer: B. Preventing water loss
13. What type of transpiration occurs through leaf epidermis?
A. Stomatal
B. Cuticular
C. Lenticular
D. None of the above
Answer: B. Cuticular
14. Lenticular transpiration occurs through:
A. Leaves
B. Stomata
C. Cuticle
D. Lenticels
Answer: D. Lenticels
15. What is the percentage of water absorbed by plants lost via transpiration?
A. 10-20%
B. 30-40%
C. 50-60%
D. 90-95%
Answer: D. 90-95%
16. Which plant shows the least transpiration rate?
A. Cactus
B. Mango
C. Grass
D. Neem
Answer: A. Cactus
17. Which pathway of water movement is involved in transpiration?
A. Apoplast
B. Symplast
C. Both Apoplast and Symplast
D. Phloem pathway
Answer: C. Both Apoplast and Symplast
18. Transpiration is measured using which instrument?
A. Hygrometer
B. Potometer
C. Manometer
D. Anemometer
Answer: B. Potometer
19. Which of these increases transpiration?
A. High humidity
B. Low wind speed
C. High temperature
D. Soil water deficit
Answer: C. High temperature
20. The cohesion-tension theory explains:
A. Sugar transport in phloem
B. Water transport in xylem
C. Nutrient uptake by roots
D. Cell division in meristems
Answer: B. Water transport in xylem
21. Transpiration aids in cooling plants by:
A. Reflecting sunlight
B. Releasing heat energy
C. Evaporative cooling
D. Reducing root activity
Answer: C. Evaporative cooling
22. Excessive transpiration leads to:
A. Increased growth
B. Wilting
C. Nutrient surplus
D. Disease resistance
Answer: B. Wilting
23. Transpiration rate is highest in which conditions?
A. Low light, high humidity
B. High light, low humidity
C. High temperature, high humidity
D. Low temperature, high humidity
Answer: B. High light, low humidity
24. Which component helps maintain water column continuity in xylem?
A. Phloem sieve tubes
B. Capillary forces
C. Guard cells
D. Cortex cells
Answer: B. Capillary forces
25. How do CAM plants regulate transpiration?
A. Open stomata during the day
B. Close stomata during the day
C. Perform transpiration at night
D. Prevent transpiration entirely
Answer: B. Close stomata during the day
26. Transpiration efficiency refers to:
A. Water absorption by roots
B. Photosynthesis per unit water lost
C. Nutrient transport efficiency
D. Growth rate of the plant
Answer: B. Photosynthesis per unit water lost
27. The loss of water due to transpiration creates:
A. Root pressure
B. Negative pressure in xylem
C. Capillary action in soil
D. Positive pressure in stomata
Answer: B. Negative pressure in xylem
28. What role does stomatal transpiration play in nutrient distribution?
A. Stops nutrient loss
B. Enhances nutrient uptake and movement
C. Dilutes nutrients in phloem
D. Prevents nutrient leaching
Answer: B. Enhances nutrient uptake and movement
29. Which is a physiological adaptation to reduce transpiration?
A. Larger leaves
B. Hairy leaf surface
C. Increased stomatal density
D. Thin cuticle
Answer: B. Hairy leaf surface
30. Root pressure contributes to water movement primarily during:
A. Daytime
B. Nighttime
C. High transpiration rates
D. Low humidity
Answer: B. Nighttime
