crop yield Flashcards

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1
Q

What factors is a plant’s rate of photosynthesis affected by?

creating ideal conditions for photosynthesis

A
  • amount of light
  • amount of carbon dioxide
  • temperature
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2
Q

What is used to give the best level of factors for photosynthesis to maximise crop yield?

creating ideal conditions for photosynthesis

A
  • glasshouses (/greentunnels)
  • polytunnels
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3
Q

Why is a glasshouse good for plants?

creating ideal conditions for photosynthesis

A
  • keeps out more pests and diseases
  • can put in artifical light to allow plants more time to photosynthesise
  • traps heat to keep plants warm. (In winter a heater may be used.)
  • CO2 level can be increased by a PARAFIN HEATER, which makes CO2 as a by product when it burns
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4
Q

Why is increasing rate of photosynthesis good?

creating ideal conditions for photosynthesis

A
  • plants grow bigger and faster
  • crop yields will be higher
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5
Q

f

why is fertiliser used?

fertiliser

A
  • to provide minerals eg nitrogen, potassium and phosphorus for compounds like proteins
  • if plants do not get enough, their growth and life processes are affected
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6
Q

Why can minerals be lacking in soil?

fertiliser

A
  • Previous crop can use it up
  • so fertilisers can replace missing minerals or provide more, increasing crop yield
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7
Q

Why does pest control improve crop yield

pest control

A
  • less plants are damaged or destroyed
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8
Q

what are the two types of pest control

pest control

A
  • pesticides
  • biological control
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9
Q

whats the problem with pesticide use?

pest control

A
  • can be poisonous to humans- have to be closely monitored in food
  • can harm other wildlife
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10
Q

Define biological control

pest control

A
  • used as an ALTERNATIVE to pesticides
  • means using other organisms to reduce the numbers of pests by either:
  • encouraging WILD organisms or adding NEW ones
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11
Q

remember the 3 Ps

State biological control types of microorganisms used with examples

pest control

A
  • predators (ladybirds eat aphids)
  • parasites (some flies lay their eggs on slugs, one day killing them)
  • pathogens (bacteria that affects caterpillars)
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12
Q

PROS and CONS of biological control

pest control

A

PROS
* longer lasting effect
* less harmful to wildlife
CONS
* can cause problems (cane toads were introduced to Australia to kill beetles but poison the native species that eat them so are now a major pest)

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