B4 - It's a green world
B4 - It's a green worldBio
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- Created by: Matthew Smolicz
- Created on: 14-04-11 16:21
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?
Recycling
- 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
Recycling
- 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
Farming
- 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.
Decay
- 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
Farming
- 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.
Decay
- 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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