B4 - It's a green world

B4 - It's a green worldBio

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Who planted that there? & Recycling - Questions

Who planted that there ?

  • Which type of leaf cell contains the most choloplasts?
  • Explain why there are air spaces between mesophyll cells.
  • Explain why a plant leaf is broad.
  • What is the purpose of stomata?


  • Name the process that removes carbon from the atmosphere.
  • Explain how carbon is released from limestone.
  • Name the type of organism that converts proteins into nitrates.
  • Describe one way in which nitrogen can be "fixed."
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Who planted that there? & Recycling - Answers

Who planted that there?

  • Palisade cells
  • They allow gases to diffuses easily and reach all the cells.
  • So it has a large surface are to absorb light.
  • To allow gas exchange


  • Photosynthesis
  • Limestone reacts with acid rain to release carbon dioxide.
  • A decomposer
  • Nitrogen fixing bacteria convert it into ammonia
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Water, water everywhere & Transport in plants - Qu

Water, water everywhere

  • What name is given to the movement of water in and out of cells?
  • Describe the change you would see using a microscope if onion cells were placed in strong salt solution.
  • Explain how osmosis is used to close the guard cell.
  • Explain why stomata are mainly found on the underside of the leaf.

Transport in plants

  • Name the vessels that carry water and minearls in the stem
  • Explain why xylm vessels are strong enough to support a tree
  • name two things that increase the rate of transpiration
  • Explain how increased light intensity increases transpiration rate.
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Water, water everywhere & Transport in plants - An

Water, water everywhere

  • Osmosis.
  • Water leaves the cells, which become plasmolysed.
  • Less sugar is made, water leaves the guard cell, the guard cell becomes plasmolysed, the stoma closes.
  • To reduce water loss.

Transport in plants

  • Xylem vessels.
  • They conatin lignin
  • Increased light intensity; increased temperatue; decreased humidty; increased air movement.
  • When light intensity increases the stomata open. This allows more water to escape.
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Plants need minerals too & Energy flow - Questions

Plants need minerals too

  • Name two minerals needed for photosynthesis.
  • Which mineral would you give a plant with poor root growth?
  • Which mineral is used to make chlorophyll?
  • Describe two differences between diffusion and active transport.

Energy Flow

  • Describe the difference between a pyramind of numbers and a pyramin of biomass.
  • Calculate the efficeny if there's 2000Kj of energy in grass and 40Kj is used for growth of a cow.
  • Explain how sugar cane can be used to fuel a car.
  • Explain why biofuels are renewable energy sources.
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Plants need minerals too & Energy flow - Answers

Plants need minerals too

  • Potassium and magnesium
  • Phosporus.
  • Magnesium
  • Active transport requires energy and is against the concentration gradient; it also uses carrier molecules.

Energy Flow

  • A pyramid of numbers shows the number of organisms, a pyramind of biomass shows the mass of organisms.
  • 40/2000 = 0.02 or 2%
  • Sugar cane is fermented using yeast to make alcohol. The alcohol is miced with petrol to make Gasohol, a fuel for cars.
  • Plants used can be replaced by growing more.
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Farming & Decay - Questions


  • Suggest one way in which intensive farming is cruel to animals.
  • Suggest one advantage of hydroponics.
  • Write down one way organic farrmers can replcae nitrogen from lost soil.
  • Sugges one disadvantage of organic farming.


  • Name three detrivores
  • What is meant by the term "optimum temperature?"
  • Explain what's meant by the term "saprophyte."
  • Explain why drying prevents food decay.
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Farming & Decay - Answers


  • Enclosed in very small spaces, given harmful drugs. etc.
  • The mineral  supply is controlled and unused minerals are recycled, reducing costs. There is better control of external conditions and disease.
  • Grow nitrogen-fixing plants, use manure, use compost.
  • High costs and a small yield.


  • Earthworms, maggots and woodlice.
  • The temperature at which enzymes work best.
  • An organism that feeds off dead and decaying material.
  • It removes the moisture that bacteria needs to grow.
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