Сборник задач по подготовке учащихся к международным исследованиям timss и pisa
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| Task 5. Wood
The tree (lat árbor.) - A vital form of woody plant with a single, clearly marked, many years, in different stepeniodrevesnevshey, continuing throughout life, an extensive (except trees) main axis - the barrel. Figure 9 Question 1. How to determine the age of a coniferous tree, if the tree trunk sawed across? A. Concentric circles B. Color crust C. For trunk thickness D. Height of the tree Answer: ______________. Question 2. Show the three main parts of the tree A. Root, stem, crown Figure 10 B. Pith, cambium, shtamb S. Crown, bole, core D. Root, trunk, bole Answer: ______________. Tasks 6. The problem of the Aral Sea One of the consequences of anthropogenic human activity, is the Aral Sea problem. The ecological situation caused considerable damage to the Aral region population. Mainly affected children, as well as residents of villages and towns in the region. The region has the highest mortality rate of children and mothers. The number 153 of both infectious and parasitic, psychosomatic diseases. Medical experts have linked them with sea desiccation. Question 1. What are the prospects or event could prevent the drying of the Aral Sea? Answer: ______________. Question 2. Formulate a question related to the improvement of the environmental problems that can be scientifically - studied. Answer: ______________. Task 7. The Island "Barsakelmes". Based on the information about the island "Barsakelmes" give one plausible explanation for reducing the number of wild asses in the period under review (from 70 to 20 years ago). Answer: ______________. Question 2. In Table 1, shown below, shows the total number who have given birth, and the number of surviving juveniles wild asses in the island "Barsakelmes" for two consecutive years. Table 1. 2000 year 2001 year Births of juveniles kulan 355 450 The number of surviving of juveniles kulan 120 170 The man, who saw this table, said that it shows that the number of wild asses is constantly growing. Is there enough data in the table to make such a conclusion? Explain your answer. Answer: ______________. Task 8. Windmills Structures Figure 11 - is a windmill with lopostyami which rotate due to wind. These rotations generators produce electricity. The stronger the wind, the blades rotate faster windmills and so produces more electric power. Figure 11 154 But in fact, between the wind speed and the generated electricity is no direct connection. Below are the four conditions under which the energy actually produced by the wind. - The blades start rotating when the wind speed is equal to V1. - Safety reasons, the rotation speed of the blades will not increase when the wind speed becomes greater than V2. - When the wind speed equal to V2 is, electric power is maximized. - The blades stop rotating when the wind speed is equal to V3. Question. Which of the graphs in Figure 12 best shows the relationship between wind speed and electric power generated under these working conditions? Answer: ______________. жүктеу/скачать 3,45 Mb. Достарыңызбен бөлісу:
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