Temperature & Environment
Does temperature affect plant growth?
Why do plants need light to grow?
Light is the energy source for plants and helps them carry out photosynthesis.
Why is humidity important in a greenhouse?
It regulates plant transpiration, nutrient uptake, and photosynthesis.
How do plant diseases harm plants?
They disrupt processes like photosynthesis, water uptake, and nutrient transport.
What are the three control methods?
Biological, chemical, mechanical
What is the highest daytime temperature plants can handle?
86 degrees
What direction do plants usually grow toward?
Toward light
Too much humidity can cause what problem?
How do plant diseases spread in a greenhouse?
They spread through water splash, airborne spores, contaminated tools/hands, and insect vectors that move between plants.
What type of pest control uses natural enemies like ladybugs?
Biological control
60-70 degrees
What is it called when a plant grows toward light?
Phototropism
What happens when plants don't get enough water?
They wilt
What does rust look like on plants?
Yellow, orange, or brown spots on the underside of leaves
What small insect sucks sap from plants and is often green or black?
Aphids
What can happen if plants get too hot?
They can wilt and die.
What does photoperiodism deal with?
Amount of light (day/night length)
permanent wilting
Name one plant disease.
Blight, rust, powdery mildew
What flying white insect is commonly found on the underside of leaves?
Whiteflies
What map shows where plants grow best based on temperatures?
Heat zone map
What can growers use to control light in a greenhouse?
Lights or shade cloth
What is the ideal humidity range?
40-80%
What is girdling?
Damage that stops nutrients from moving through the plant
What pest looks like tiny spiders and causes yellow spots on leaves?
Spider mites