Flashcards on Optimizing Crop Growth Conditions
Optimizing Crop Growth Conditions: A Student's SEO Guide
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Crop production in polytunnels
8 cards
Card 1
Question: What is one reason carbon dioxide levels must be monitored inside a polytunnel or glasshouse?
Answer: Plants use carbon dioxide for photosynthesis; a shortage would limit the rate of photosynthesis.
Card 2
Question: Why can carbon dioxide levels inside a polytunnel drop on a warm sunny day?
Answer: Actively growing plants use more carbon dioxide for photosynthesis than they release, causing levels to fall.
Card 3
Question: How can low carbon dioxide levels inside a polytunnel be prevented or corrected?
Answer: Provide adequate ventilation to replace carbon dioxide from outside air or supply carbon dioxide artificially.
Card 4
Question: Why is supplying extra carbon dioxide sometimes done in glasshouses?
Answer: Extra carbon dioxide above atmospheric levels can encourage increased growth of crop plants; it is more effective in a glasshouse than in a polytunnel
Card 5
Question: Which environmental conditions inside a polytunnel must be carefully monitored for successful crop production?
Answer: Temperature, humidity, and soil moisture level.
Card 6
Question: How are adjustments to conditions inside a polytunnel often made?
Answer: Conditions are often monitored and adjusted automatically using control systems.
Card 7
Question: What simple model can demonstrate the greenhouse effect and the benefits of a polytunnel?
Answer: Using half a polythene (plastic) bottle placed over soil with a thermometer underneath, and another thermometer outside to compare temperatures.
Card 8
Question: In the polythene bottle model activity, what measurements are taken?
Answer: Temperature readings from a thermometer placed under the bottle and from a thermometer on the soil outside the bottle, recorded at regular intervals.