Virginia Commercial Pesticide
Applicator: 3a Exam 2026 Questions and
Answers
List at least 6 stress factors that can harm plants growing outdoors - Correct
answer-- Drought
- Heavy rains
- Heavy winds
- Extreme temperatures
- Late frosts
- Ice and snow
- Air pollution
- Mechanical injury and soil compaction
- Exposure to chemicals (road salt)
- Heat island effect
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,Name 4 stress factors that can harm plants growing indoors - Correct answer--
Temperature fluctuation from HVAC
- Low humidity
- Dust
- Low light or high variation in light exposure
- Drafts
- Exposure to spills or cleaning compounds
What are the basic needs of plants? - Correct answer-Light, air, moisture, and
nutrients
Name 4 environmental factors that effect plant growth - Correct answer--
Temperature
- light
- relative humidity
- soil moisture
- availability of essential minerals
What abiotic factors may lead to drought stress? - Correct answer-- Lack of root
space
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, - Lack of rainfall
- Insufficient irrigation
What is the ideal temperature range for indoor plants? - Correct answer-55-90
degrees
What do drastic temperatures do to plants? - Correct answer-Low temperatures
slow growth and chilling injuries. High temperatures result in wilting and use of
food stores. Temperature fluctuations cause shock.
What are degree days? - Correct answer-Measures of accumulated heat. Degree
days help predict the development timelines of insects, weeds, or diseases.
What is the relationship between how much light a plant receives and the amount
of water that it needs? - Correct answer-More light = more growth
More growth = more water required
What negatives are caused by low humidity? - Correct answer-Wilting, decreased
food production, browning of leaf margins, scorched leaves, and dull foliage
Why do plants need pore spaces in growing media? - Correct answer-To allow
roots to take in oxygen and give off carbon dioxide
What is the difference between macro- and micronutrients? - Correct answer-
Macronutrients are chemical elements that plants need in relatively large amounts.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
Applicator: 3a Exam 2026 Questions and
Answers
List at least 6 stress factors that can harm plants growing outdoors - Correct
answer-- Drought
- Heavy rains
- Heavy winds
- Extreme temperatures
- Late frosts
- Ice and snow
- Air pollution
- Mechanical injury and soil compaction
- Exposure to chemicals (road salt)
- Heat island effect
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,Name 4 stress factors that can harm plants growing indoors - Correct answer--
Temperature fluctuation from HVAC
- Low humidity
- Dust
- Low light or high variation in light exposure
- Drafts
- Exposure to spills or cleaning compounds
What are the basic needs of plants? - Correct answer-Light, air, moisture, and
nutrients
Name 4 environmental factors that effect plant growth - Correct answer--
Temperature
- light
- relative humidity
- soil moisture
- availability of essential minerals
What abiotic factors may lead to drought stress? - Correct answer-- Lack of root
space
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, - Lack of rainfall
- Insufficient irrigation
What is the ideal temperature range for indoor plants? - Correct answer-55-90
degrees
What do drastic temperatures do to plants? - Correct answer-Low temperatures
slow growth and chilling injuries. High temperatures result in wilting and use of
food stores. Temperature fluctuations cause shock.
What are degree days? - Correct answer-Measures of accumulated heat. Degree
days help predict the development timelines of insects, weeds, or diseases.
What is the relationship between how much light a plant receives and the amount
of water that it needs? - Correct answer-More light = more growth
More growth = more water required
What negatives are caused by low humidity? - Correct answer-Wilting, decreased
food production, browning of leaf margins, scorched leaves, and dull foliage
Why do plants need pore spaces in growing media? - Correct answer-To allow
roots to take in oxygen and give off carbon dioxide
What is the difference between macro- and micronutrients? - Correct answer-
Macronutrients are chemical elements that plants need in relatively large amounts.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
