Agricultural/Bioengineering Greenhouse and Controlled Environment Agriculture

Question 1

The greenhouse effect within a glasshouse structure occurs because:

Accepted Answer

Short-wave solar radiation enters and is re-emitted as long-wave infrared radiation that cannot escape through the glazing

Answer

Plants absorb all sunlight directly

Answer

Ventilation fans trap heat inside

Answer

CO2 enrichment raises internal temperature

Question 2

Hydroponic systems grow plants without soil by delivering nutrients dissolved in:

Accepted Answer

A carefully balanced water solution containing essential macro and micronutrients

Answer

Pure distilled water only

Answer

Organic compost tea only

Answer

Rainwater with added sugar

Question 3

In a nutrient film technique (NFT) hydroponic system, plants are grown in:

Accepted Answer

Channels where a thin film of nutrient solution flows continuously over roots

Answer

Deep water tanks where roots are fully submerged

Answer

Inert growing medium flooded and drained intermittently

Answer

Aeroponics chambers where roots are misted

Question 4

Supplemental LED lighting in greenhouses is used primarily to:

Accepted Answer

Extend photoperiod or supplement natural light to increase growth and year-round production

Answer

Provide heat during cold nights

Answer

Sterilize the growing environment

Answer

Simulate the greenhouse effect

Question 5

Vapor pressure deficit (VPD) is monitored in greenhouses because it affects:

Accepted Answer

Plant transpiration rate, water uptake, and nutrient delivery to leaves

Answer

Soil nutrient availability

Answer

CO2 fixation in photosynthesis directly

Answer

Root respiration rates only

Question 6

The primary advantage of vertical farming in controlled environment agriculture is:

Accepted Answer

Dramatically higher crop yield per unit of land area through stacked growing layers

Answer

Lower electricity costs compared to field production

Answer

Elimination of all inputs including water and nutrients

Answer

Greater genetic diversity in crop production