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

Greenhouse glazing transmits short-wave solar radiation inward, which warms interior surfaces and is re-emitted as long-wave infrared radiation that is largely trapped by the covering material.

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

Hydroponic systems supply all plant-essential nutrients through a precisely formulated aqueous nutrient solution delivered directly to plant roots.

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

NFT systems recirculate a shallow, continuous stream of nutrient solution over bare roots in sloped channels, providing both nutrients and oxygen to the root zone.

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

Supplemental LED lighting extends daily light integral (DLI) or day length during short winter days, enabling year-round crop production in controlled environment agriculture.

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

VPD drives transpiration — too high causes plant stress and wilting, too low promotes disease; controlling VPD optimizes growth and prevents physiological disorders.

Agricultural/Bioengineering Practice Test

Agricultural/Bioengineering Practice Test

Agricultural/Bioengineering Greenhouse and Controlled Environment Agriculture