1. Guttation commonly occurs when the soil is:
A.
Very dry
B.
Well supplied with water
C.
Frozen
D.
Completely without minerals
Correct Answer:
Well supplied with water
Explanation:
Guttation is favored when the soil contains plenty of water, allowing roots to absorb water and build root pressure.
2. Guttation is most likely to occur when transpiration is:
A.
Very high
B.
Moderate throughout the day
C.
Very low
D.
Absent because the plant is dead
Correct Answer:
Very low
Explanation:
When transpiration is low, especially at night, water can accumulate in the plant and be forced out as guttation.
3. Which atmospheric condition favors guttation?
A.
Dry air
B.
High humidity
C.
Strong sunlight
D.
Hot, dry wind
Correct Answer:
High humidity
Explanation:
High humidity reduces transpiration, making guttation more likely when water absorption by the roots continues.
4. Guttation is commonly observed during:
A.
A hot and dry afternoon
B.
A cool and humid night
C.
A windy midday
D.
A drought period
Correct Answer:
A cool and humid night
Explanation:
Cool, humid nights reduce transpiration while moist soil supports continued water absorption, favoring guttation.
5. Which combination of conditions is most suitable for guttation?
A.
Dry soil and strong wind
B.
Moist soil and high humidity
C.
Frozen soil and bright sunlight
D.
Dry soil and low root activity
Correct Answer:
Moist soil and high humidity
Explanation:
Moist soil provides water for absorption, while high humidity lowers transpiration; together, these conditions favor guttation.
6. Guttation is more likely in plants growing in:
A.
Water-deficient soil
B.
Waterlogged or very moist soil
C.
Completely dry sand
D.
Rock without water
Correct Answer:
Waterlogged or very moist soil
Explanation:
Very moist soil allows continuous water uptake by roots, which can promote guttation when transpiration is low.
7. Which weather condition generally reduces the chance of guttation?
A.
A humid night
B.
A cool morning
C.
A hot, dry, windy day
D.
A period of high soil moisture
Correct Answer:
A hot, dry, windy day
Explanation:
Hot, dry, and windy conditions increase transpiration, so water is lost mainly as vapor rather than as guttation droplets.
8. Guttation is usually seen when water absorption by roots is:
A.
Greater than water loss by transpiration
B.
Less than water loss by transpiration
C.
Completely stopped
D.
Unrelated to soil water
Correct Answer:
Greater than water loss by transpiration
Explanation:
Guttation occurs when roots absorb water while transpiration is low, causing excess water to be released from leaf margins or tips.
9. Which time of day is generally most favorable for guttation?
A.
Late night or early morning
B.
Noon in strong sunlight
C.
Mid-afternoon during dry wind
D.
The hottest part of the day
Correct Answer:
Late night or early morning
Explanation:
Transpiration is usually low at night and in the early morning, while moist soil may allow continued water uptake.
10. Guttation is favored when the surrounding air has:
A.
Low relative humidity
B.
High relative humidity
C.
Very little oxygen only
D.
No water vapor
Correct Answer:
High relative humidity
Explanation:
High relative humidity lowers the water vapor gradient between the leaf and air, reducing transpiration and favoring guttation.
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