Book resource: Science power Class 8th Check point [Formative Assessment] 1. Define Afforestation? Answer: The practice of planting more and more trees is called Afforestation. 2. What is desertification? What causes desertification? Answer: The phenomenon of converting fertile land into desert is called desertification. Deforestation causes desertification. 3. What is the effect of deforestation on rainfall and climate? Answer: Deforestation increases temperature and wind velocity that reduce rainfall. These changes led to climate change. 4. What is wild life? Answer: Wild life is an area where organism lives in their natural habitat like dense forest, jungle and water bodies. 5. Give one difference between endangered and vulnerable? Answer: Endangered are those animals that are not likely survive and will soon extinct where as Vulnerable are those animal which are likely to move in endangered category in future. 6. What is Red Data Book? Answer: Red Data Book is the source book which keeps a record of all the endangered animals and plants. 7. Name the first national park of India? When it was it established? Answer: A national park is protected land area that provide natural habitat to wild life. Jim Corbett National Park is the first national park of India established in 1936. 8. Name three different region of biosphere reserve? Answer: Core Zone, Buffer Zone, and Manipulation Zone. 9. Name the international body responsible for wild life conservation? Answer: World Conservation union 10. What is the objective of project tiger? Answer: To save tigers from unauthorized killing. 11. What are endemic species? Answer: Endemic species are those species of plants and animals which are found exclusively in a particular area and do not found anywhere else naturally. Related posts for 8th Conservation of Plants and Animals Conservation of Plants and Animals Download File Check point[Formative Assessment] Download File Science power [Solved Assessment] Download File
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1. A farmer floods his field everyday thinking that watering in this manner will result a better yield of his wheat crop. What will be the result of this action of the farmer. Ans.This will result in water logging of the soil due to which roots cannot breathe and ultimately plants will die . 2. Name the term for transport of food from leaves to other parts of plants. Ans.Translocation 3. Which pancreatic enzyme is effective in digesting proteins? Ans.Trypsin 4. Which enzyme is present in saliva breaks down starch? Ans.Salivary amylase. 5. After a vigorous exercise you may experience cramps in your leg muscles. Why does this happen? Ans.Accumulation of lactic acid 6. Name the organelle in which photosynthesis occurs. Ans.Chloroplast. 7. Name the type of blood vessels which carry blood from organs to the heart. Ans.Veins. 8. Name the respiratory structures of i.Mosquito ii)earth worm. Ans.i) mosquito—System of air tubes. ii)earth worm—moist skin. 9. Write the two functions of kidneys. Ans. Osmoregulation and excretion. 10. What are spiracles. Ans The holes found on the lateral side of insect‘s body.X X Trigonometry Introduction and identities Test Paper - 1
Download File X Trigonometry Introduction and identities Test Paper - 2 Download File X Trigonometry Introduction and identities Test Paper - 3 Download File X Trigonometry Introduction and identities Test Paper - 4 Download File X Trigonometry Introduction and identities Test Paper - 5 Download File Solved class 10 Trigonometry Introduction and identities Test Papers Metal and Non Metal solved questions for class 10 1. Why can jewellery be made out of gold and silver easily? 2. Why do diamond and graphite have different physical properties? 3. Name any one metal that does not react with dilute H2SO4 to liberate H2. 4. Write the name given to the alloy of lead and tin that which is used for welding electrical wires together. 5. Name one non–metal with metallic luster. 6. Name the various types of ores from which metals are extracted. Which type of ore is the most common for most metals and why? 7. Why are metals used for making cooking vessels? Why copper and silver are most commonly used for making cooking vessels? 8. Define minerals, ore and gangue 9. Why do metals and non–metals react? Explain with the help of an example 10. What is the need of refining? What is electrolytic refining? SOLUTIONS 1. Because gold and silver are malleable and ductile. 2. Because the arrangement of atoms in the two is different. 3. Copper or silver 4. Solder 5. Iodine 6. The ores used in the extraction of metals are (i) oxide ore (ii) sulphate ore (iii) carbonate ore (iv) halide ore The ores of many metals exist as oxides. This is because oxygen is very reactive element and is present in a large amount on the earth. 07 Metals are generally good conductors of heat and have high melting points. So metals can withstand high temperature without melting. Metals are malleable thus, they can be given various shapes Silver and copper are best conductors of heat and they are malleable. Hence, they are preferred for making cooking vessels 08. Minerals: The elements or compounds, which occur naturally in the earth’s crust, are known as minerals. E.g. Magnesium oxide, ferrous oxide. Ores: At some places, minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores. E.g. Ore of iron in hematite. Gangue: Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand etc and are called gangue. E.g. gangue present along with hematite is silicon dioxide. 09. Metals are electropositive elements and have a tendency to lose electrons and acquire a positive charge while non–metals are electronegative elements and tend to gain electrons and acquire a negative charge. By doing this both metals and non metals attain the stable noble gas configuration. For the metals and non–metals to react, the electron lost by the metal atom will have to be gained by the non metal atom. The ions formed in this way are held together by strong electrostatic forces of attraction which results in the formation of ionic compounds. 10.The metals produced by various reduction processes are not pure. They contain impurities, which must be removed to obtain pure metals. The process of purification of metals is known as REFINING. Most widely used method for refining impure metals is electrolytic refining. Electrolytic refining means purification of metals by electrolysis. Many metals, such as copper, zinc, tin nickel, silver, gold etc are refined electrolytically. Click here for further study CBSE Extra Score Notes X Metals and Non Metals CBSE Class X Science Term-1
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