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Unit 1: Plant nutrition
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Absorb (v): to take in a substance or energy from the surrounding area. amino acids (n): biomolecules which combine to form proteins. autotroph (n): a living thing which produces its own food. Plants…
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True and False. Equilibrium
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Answer true or false: An object is in equilibrium when the sum of the forces acting upon it is equal to zero. If an object is in equilibrium it cannot be moving. A block at rest hanging on the cable of…
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Complete. Pressure
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Complete the text with the correct words. The relationship between force applied and the surface area it is applied to is : , P, is the ratio of the applied, F, to the , A, over which it is exerted: P =…
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Analyse. The relief of the Creus cape
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Read the text on this web page, look at the images and answer the questions: What shape are the rocks of the Creus cape? Give an example. Which forces that modify relief are responsible? What other…
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Think about it. The transport of substances in plants
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Remember what you have studied in this section and answer the questions: How does transpiration and the force of cohesion contribute to the movement of raw sap? You see sap dripping from a leaf. It is…
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Calculate - End-of-unit activities
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Calculate the work done by a person who pushes a wheelbarrow for a distance of 100 m if he exerts a force of 500 N. What is the efficiency of a machine which does 230 J of work but uses 410 J of total energy?
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Police and Detectives in the 19th Century
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In the early part of the nineteenth century there was a lot of crime in London. The city was crowded and criminals could hide easily. It was often not safe to walk down the dark streets. In 1829 Sir…
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True / false. States of matter and their properties
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Are the following sentences true or false? Solids do not change their shape unless an external force is applied to them. Solids have a stable shape and a variable volume. Liquids have a constant volume…
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Newton's law of gravitation
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Basing his work on many different kinds of experiments, the English physicist Sir Isaac Newton (1642 – 1727) established the law of gravitation. The law of gravitation states that the greater the…
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Match. Republic versus military dictatorship
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Match each definition with a concept: Organisation that managed the war and civilian life from behind the scenes, and collectivised factories and confiscated large land estates. Large military force…
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