What is the primary goal of a summer cooling system in greenhouses?
B
Decrease relative humidity
C
Reduce excessive heat buildup
D
Promote soil moisture loss
Analysis & Theory
Summer cooling systems are used to maintain optimal temperature by reducing excess heat inside the greenhouse.
Which of the following is a commonly used summer cooling system in greenhouses?
Analysis & Theory
All listed systems (fan and pad, fogging, and shade nets) are effective methods for summer cooling.
How does a fan and pad system work in a greenhouse?
A
Using geothermal cooling
B
By mechanical refrigeration
C
Evaporative cooling through water-soaked pads
D
Cooling with cold air injection
Analysis & Theory
The fan and pad system works on the principle of evaporative cooling, where hot air passes through wet pads to reduce temperature.
Which is a passive method of reducing heat during summer in greenhouses?
Analysis & Theory
Shade nets reduce solar radiation passively without energy input, helping lower temperatures.
Which of the following is a **winter season requirement** for crop protection in greenhouses?
Analysis & Theory
Heating systems are necessary during winter to maintain suitable temperatures for crop growth.
What is a common source of heating in winter greenhouse systems?
C
Electric or gas heaters
Analysis & Theory
Electric and gas heaters are commonly used to provide warmth during cold conditions.
Which of the following helps conserve heat in greenhouses during winter?
Analysis & Theory
Thermal screens reduce heat loss at night by trapping warm air inside the greenhouse.
Why is uniform heating important in greenhouses during winter?
B
Avoids uneven plant growth
D
Decreases photosynthesis
Analysis & Theory
Uniform heating ensures all plants receive optimal warmth, avoiding stress and uneven growth.
Which system uses **high-pressure mist** to lower temperature in summer?
Analysis & Theory
Fogging systems create fine mist that evaporates quickly, absorbing heat and cooling the environment.
Which measure is essential during both summer and winter to maintain optimal crop growth in greenhouses?
Analysis & Theory
Ventilation is crucial year-round to regulate temperature, humidity, and gas exchange in greenhouses.