Agriculture + Industry

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1. What is the benefit of crop rotation?

  • Different minerals are taken from the soil by different plants, so there are always sufficient nutrients for each crop as the land has time to recover. Also, crops can be staggered throughout the year and there isn't time for pests to build up
  • Having a variety of crops means that if a disease of pest kills off one crop, the farmer always has some crops left to sell
  • Crops can be grown throughout the year, so the minerals in the soil are always being used
  • Rotating the crops around ensures that they don't have enough time to settle down properly and so grow poor roots, making them easier to extract from the soil
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Other questions in this quiz

2. Where does the position of equilibrium lie if Kc < 1?

  • On the left
  • On the right
  • In the middle
  • Kc cannot be less than 1

3. What is reduction?

  • The decrease in oxidation state or gain of electrons
  • The decrease in oxidation state or loss of electrons
  • The increase in oxidation state or loss of electrons
  • The increase in oxidation state or gain of electrons

4. What is a selective herbicide?

  • A herbicide which targets particular plant features common to weeds only
  • A herbicide which only kills one weed
  • A herbicide which persists on the leaves of the crop and thus selectively protects the crop only
  • A herbicide which is made of a living organism which only lives on weeds, thus selectively targeting weeds

5. What is the equation for the percentage yield of a reaction?

  • % yield = actual yield / predicted yield *100
  • % yield = (actual yield - predicted yield) / predicted yield *100
  • % yield = mass of desired product / mass of reactants *100
  • % yield = moles of desired product / moles of reactants *100
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