Controlled Environment Agriculture (Greenhouses, Polyhouses) MCQs

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1. : What is Controlled Environment Agriculture (CEA)?
(A) Farming using only rainwater
(B) Crop production under controlled climatic conditions
(C) Cultivation in open fields
(D) Organic farming only

2. : Which structure is most commonly used in Controlled Environment Agriculture?
(A) Warehouse
(B) Polyhouse
(C) Barn
(D) Poultry shed

3. : Which of the following is NOT a component of a greenhouse?
(A) Covering material
(B) Ventilation system
(C) Tractor engine
(D) Cooling pad

4. : Which material is commonly used for covering polyhouses?
(A) Glass
(B) Polyethylene film
(C) Wood
(D) Steel sheet

5. : The main advantage of greenhouse farming is:
(A) Dependence on rainfall
(B) Year-round crop production
(C) High labor requirement
(D) High pest attack

6. : Which crop is commonly grown in greenhouses worldwide?
(A) Wheat
(B) Rice
(C) Tomato
(D) Sugarcane

7. : The process of cooling a greenhouse using water-saturated pads and fans is called:
(A) Drip irrigation
(B) Evaporative cooling
(C) Heat trapping
(D) Mulching

8. : Which irrigation method is best suited for greenhouses?
(A) Flood irrigation
(B) Drip irrigation
(C) Sprinkler irrigation
(D) Furrow irrigation

9. : Which of the following sensors is NOT used in CEA?
(A) Temperature sensor
(B) Humidity sensor
(C) Soil moisture sensor
(D) Earthquake sensor

10. : What is the optimal temperature range for most greenhouse crops?
(A) 10–15°C
(B) 18–30°C
(C) 35–45°C
(D) Below 5°C

11. : What is the function of shade nets in Controlled Environment Agriculture?
(A) Increase pest attacks
(B) Control light intensity
(C) Increase soil erosion
(D) Reduce humidity

12. : Which gas is enriched in greenhouses to promote photosynthesis?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Helium

13. : Polyhouses are more common in which type of countries?
(A) Polar countries
(B) Arid and semi-arid regions
(C) Tropical rainforests
(D) Mountainous regions only

14. : Hydroponics in greenhouses refers to:
(A) Growing crops without soil
(B) Growing crops in deserts
(C) Growing crops in lakes
(D) Growing crops in forests

15. : Which of the following is an advantage of polyhouse cultivation?
(A) Uncontrolled climate
(B) High yield per unit area
(C) High pest infestation
(D) Lower quality produce

16. : Which covering material provides the best light transmission in greenhouses?
(A) Glass
(B) Polyethylene
(C) Fiber sheets
(D) Netting

17. : What is fertigation in greenhouse farming?
(A) Application of pesticides
(B) Application of fertilizers through irrigation water
(C) Removing weeds
(D) Mixing compost with soil

18. : Which of the following crops is least suitable for greenhouse cultivation?
(A) Tomato
(B) Capsicum
(C) Lettuce
(D) Sugarcane

19. : Which of the following is NOT an environmental parameter controlled in greenhouses?
(A) Temperature
(B) Humidity
(C) Light
(D) Earth’s gravity

20. : The structural frame of polyhouses is commonly made of:
(A) Bamboo or GI pipes
(B) Glass only
(C) Concrete walls
(D) Aluminum sheets

21. : Which is a major limitation of Controlled Environment Agriculture?
(A) Low yield
(B) High initial investment cost
(C) Dependence on monsoon
(D) Poor quality crops

22. : Which type of greenhouse uses natural ventilation only?
(A) Fan-and-pad system greenhouse
(B) Naturally ventilated polyhouse
(C) Climate-controlled greenhouse
(D) Tunnel dryer

23. : In greenhouse farming, mulching is used for:
(A) Weed control and moisture conservation
(B) Pest multiplication
(C) Enhancing soil erosion
(D) Increasing salinity

24. : Which of the following technologies is associated with modern greenhouses?
(A) IoT-based automation
(B) Flood irrigation
(C) Ox-driven plough
(D) Manual pest control only

25. : Which of the following is a key benefit of Controlled Environment Agriculture?
(A) Lower crop quality
(B) Increased water use
(C) Off-season production
(D) Dependence on rainfall