Crop Microclimate and Modification
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Question No. 1
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Which of the following refers to the immediate atmospheric environment surrounding an individual plant or crop canopy?
A.
Macroclimate
B.
Mesoclimate
C.
Microclimate
D.
Global climate
Question No. 2
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The primary purpose of installing windbreaks in agricultural fields is to modify which microclimatic factor?
A.
Soil temperature
B.
Air humidity
C.
Wind speed
D.
Light intensity
Question No. 3
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Which type of mulch is most effective in increasing soil temperature and promoting early crop growth in cooler climates?
A.
Straw mulch
B.
Black plastic mulch
C.
Wood chip mulch
D.
Green manure
Question No. 4
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The ratio of reflected solar radiation to incident solar radiation is known as:
A.
Emissivity
B.
Albedo
C.
Transmissivity
D.
Absorptivity
Question No. 5
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Fogging or misting systems are primarily used in greenhouses to control which microclimatic parameter?
A.
Light intensity
B.
Carbon dioxide concentration
C.
Relative humidity
D.
Wind velocity
Question No. 6
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What is the primary effect of a dense crop canopy on the microclimate within the canopy?
A.
Increased wind speed and reduced humidity
B.
Decreased temperature fluctuation and higher humidity
C.
Higher light intensity at the soil surface
D.
Reduced CO2 concentration due to lack of air movement
Question No. 7
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Shade nets are predominantly used in horticulture to mitigate the adverse effects of:
A.
Excessive rainfall
B.
Low night temperatures
C.
High solar radiation
D.
Strong winds
Question No. 8
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The process where heat is transferred from a warmer surface to a cooler fluid (air or water) in motion is called:
A.
Conduction
B.
Radiation
C.
Convection
D.
Evaporation
Question No. 9
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Which modification technique is most effective for frost protection in orchards by releasing latent heat of fusion?
A.
Using large fans
B.
Applying straw mulch
C.
Sprinkler irrigation
D.
Constructing windbreaks
Question No. 10
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The term 'degree days' (or Growing Degree Days) is primarily used in agriculture to predict:
A.
Soil moisture content
B.
Crop development stages
C.
Disease incidence
D.
Nutrient availability
Question No. 11
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What is the effect of white plastic mulch on soil temperature compared to bare soil?
A.
Significantly increases soil temperature
B.
Significantly decreases soil temperature
C.
Has no effect on soil temperature
D.
Increases soil temperature slightly at night
Question No. 12
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Row covers (e.g., spunbonded polypropylene) are typically used for:
A.
Reducing light intensity
B.
Enhancing wind speed
C.
Providing pest protection and moderate temperature increase
D.
Increasing CO2 concentration
Question No. 13
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Which gas is often enriched in greenhouse microclimates to enhance photosynthesis?
A.
Oxygen
B.
Nitrogen
C.
Carbon Dioxide
D.
Methane
Question No. 14
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The 'boundary layer' around a plant leaf is characterized by:
A.
Rapid air movement and high transpiration
B.
Reduced air movement and higher humidity
C.
Constant CO2 concentration
D.
Always being cooler than ambient air
Question No. 15
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Which of the following is an example of an advective frost?
A.
Clear, calm night with radiation cooling
B.
Cold air mass moving into an area, accompanied by wind
C.
Cloudy night with high humidity
D.
Frost occurring at high altitudes only
Question No. 16
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What impact does increasing planting density typically have on the microclimate within a crop canopy?
A.
Decreases humidity and increases air movement
B.
Increases light penetration to lower leaves
C.
Increases humidity and reduces air movement
D.
Reduces competition for light among plants
Question No. 17
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Reflective mulches (e.g., silver plastic mulch) are primarily used for:
A.
Suppressing weeds and increasing soil temperature
B.
Repelling certain insect pests and moderating soil temperature
C.
Conserving soil moisture and promoting early growth in cold regions
D.
Providing structural support to plants
Question No. 18
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The measurement of photosynthetically active radiation (PAR) is critical for understanding the microclimate's impact on:
A.
Water uptake
B.
Root growth
C.
Photosynthesis
D.
Nutrient cycling
Question No. 19
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Which of these is a direct method to raise air temperature around individual plants to protect against light frost?
A.
Drip irrigation
B.
Covering with hot caps or cloches
C.
Applying organic mulch
D.
Planting cover crops
Question No. 20
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When converting a traditional open field into a polyhouse (plastic greenhouse), the most significant microclimatic change expected is:
A.
Increased wind speed inside
B.
Stabilized temperature and humidity conditions
C.
Reduced light intensity to critical levels
D.
Lower CO2 levels without enrichment
Question No. 21
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The use of an overhead fan system in an orchard during a radiation frost event aims to:
A.
Introduce warm air from outside the orchard
B.
Mix cold air near the ground with warmer air aloft
C.
Increase the humidity around the trees
D.
Reduce wind speed to prevent desiccation
Question No. 22
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Soil solarization, a microclimate modification technique, is primarily used for:
A.
Increasing soil organic matter
B.
Sterilizing soil by increasing temperature
C.
Improving soil structure
D.
Reducing water runoff
Question No. 23
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Which orientation of crop rows is generally preferred in areas with strong prevailing winds to minimize wind damage and improve microclimate?
A.
Perpendicular to the prevailing wind direction
B.
Parallel to the prevailing wind direction
C.
North-South orientation
D.
East-West orientation
Question No. 24
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The phenomenon of 'thermal inversion' can lead to increased frost risk because:
A.
Warm air gets trapped at the surface
B.
Cold air is trapped near the ground under a layer of warmer air
C.
It increases convective heat transfer
D.
It promotes strong winds
Question No. 25
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The use of anti-transpirants on crop leaves primarily aims to modify which aspect of the crop microclimate interaction?
A.
Light absorption
B.
Carbon dioxide uptake
C.
Water loss through transpiration
D.
Root respiration
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