crop plants: glasshouses and polyethene tunnels

Question 1

what do glasshouses and polyethene tunnels provide for farmers?

Answer 1

an enclosed environment where farmers can control the conditions and increase crop yield

Question 2

what 4 conditions can be changed in greenhouses?

Answer 2

artificial heating
artificial lighting
increasing CO2 concentration
regular watering

Question 3

how can artificial heating increase crop yield?

Answer 3

enzymes controlling photosynthesis can work faster at slightly higher temperatures

Question 4

how can artificial lighting increase crop yield?

Answer 4

plants can photosynthesise for longer

Question 5

how can increasing CO2 content of the air inside increase crop yield?

Answer 5

plants can photosynthesise quicker

Question 6

what are polyethene tunnels also known as?

Answer 6

polytunnels

Question 7

what are polyethene tunnels?

Answer 7

large plastic tunnels that cover crops

Question 8

what can polyethene tunnels protect?

Answer 8

can protect crops grown outside from the effects of the weather, including excessive wind, rain and extreme temperatures

Question 9

what can polyethene tunnels increase?

Answer 9

the temperature slightly inside the tunnel

Question 10

what can polyethene tunnels prevent?

Answer 10

the entry of pests that can damage plants or diseases that can kill plants