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The transport of substances in plants
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2.1. Plant transport systems Plants have two transport systems, one for each type of sap that is transported: Xylem. This system transports raw sap (water and mineral salts) from the root up the stem to…
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Think about it. Sexual reproduction in plants
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Remember what you have studied in this section and answer the questions: Why do more evolved plants have a smaller gametophyte? Discuss with a classmate. What is the advantage and disadvantage of having…
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Check. Biomes
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Remember what you have studied in this section and answer the questions: Is vegetation in tropical rainforests evergreen or deciduous? Why? Which biome has the highest annual rainfall? How does…
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Did you know?
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The mass of an object does not change when you move it from one place to another or take it to the Moon. But weight does vary, because the magnitude of gravity on Earth is not constant at 9.8 m/s2…
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Calculate. Forces and work
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¿What is the efficiency (expressed as a percentage) of a machine that performs work of 1190 J and 1400 J for it consumption? η = %
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Investigate. Non-renewable sources of energy
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Remember what you have studied in this section and answer the questions: Find out what other products are obtained from coal and oil and say what they are used for. Find out how a nuclear power station…
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Check. Materials that conduct and insulate heat
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Remember what you have studied in this section and answer the questions: What are the three ways by which heat is propagated? Give one example of each. Does matter move in convection? And in radiation?…
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Unit 12: Waves. Light and sound
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Amplitude (n): the distance between a crest or a trough and the equilibrium position of a wave. converging lens (n): a lens which concentrates the light which passes through it. deafness (n): not being…
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Did you know...
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During the French Revolution, citizens were grouped into societies (clubs) according to their political affinities and in order to have some influence in the Assembly. Amongst the most popular clubs…
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Describe. United States and the crisis of 1898
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Look at the illustration and answer the questions: What conflict is depicted in this cartoon? What caused it? Describe the characters and the action. Explain the symbolism. What do the teeth represent?
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