B4 - It's a green world B4 - It's a green worldBio 3.0 / 5HideShow resource informationBiologyEcology and Environmental ScienceGCSEAll boardsCreated by: Matthew SmoliczCreated 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." 1 of 8 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 2 of 8 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. 3 of 8 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. 4 of 8 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. 5 of 8 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. 6 of 8 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. 7 of 8 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. 8 of 8
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