5a Flashcards

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1
Q

How can greenhouses increase the yield of crops?

A

Can provide artificial lighting, warmth and CO2. They are limiting factors for photosynthesis. More photosynthesis —> More yield.

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2
Q

Effects of increased carbon dioxide and increased temperature on crop yield

A

Crop yield is increased. They all limit the rate of photosynthesis and therefore growth.

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3
Q

How can fertilizer increase crop yield

A

Fertilizers provide mineral ions to the soil. Plants (crops) need these mineral ions for growth. Fertilizers can therefore increase yield.

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4
Q

Why are pesticides used

A

Pesticides eliminate pests that reduce the yield of a crop.

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5
Q

Fertiliser Contents

A

NPK

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6
Q

Types of pesticides

A

Herbicides
Insecticide
Fungicide
Moluscide

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7
Q

Pesticide Problems

A
  • Persistent
  • Resistance develops
  • Bioaccumulation
  • Toxic (kills bees)
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8
Q

Fish Farming

A

Fish are farmed because they are a source of high-quality protein. They are farmed in densely stocked enclosures in rivers, lakes, or the sea.

Advantages:
- Water quality can be monitored
- The diet of the fish can be carefully controlled
- Selective breeding programs can increase the quality of the fish
- Fish are protected from predators

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9
Q

Role of lactobacilus

A
  • Used in yogurt production
  • Breaks down lactose into lactic acid
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10
Q

Role of yeast

A
  • Bread and beer production
  • Respire anaerobically to release ethanol and carbon dioxide
  • Carbon dioxide to make bread rise. Ethanol to give alcoholic content.
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11
Q

Fermentor

A
  • Used to give suitable conditions for the growth of microorganisms
  • Control: temperature, nutrition, pH, sterelisation, oxygentaion…
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