Human can neither change, model, class 9

 

Part A : Reading Test (Marks-50)

Read the passage carefully and answer the questions following it.                  Unit-5: Lesson-3(A)

Human can neither change the sun’s radiation nor the earth’s orbit around the sun. But they can control the increase in the amount of greenhouse gases and its effect on the atmosphere. Only during the last hundred years the carbon dioxide concentration has been raised alarmingly in the atmosphere and we humans can be held responsible for this.

The main cause of the increase in carbon dioxide level in the atmosphere is the burning of fossil fuels. Since the end of the 19^th century, industrial activities increased rapidly giving rise to many factories. These factories required energy, which was produced through the combustion of coal. Besides coal, other sources of energy such as mineral oil and natural gas were also burned to heat our houses, move cars and airplanes or to produce electricity. Nowadays, about 85 million barrels of crude oil are burned daily. Every time a fossil raw material is burned, it releases carbon dioxide into the air.

Therefore, it is clear that more and more greenhouse gases like carbon dioxide are being generated worldwide by humans. Moreover, we are also strengthening the greenhouse effect by deforestation which means cutting down trees. Every year enormous areas of forests are destroyed by people to obtain wood and to clear regions for mining and to create pasture. This loss of the forest causes dual problems. Trees that are burned down release a large volumes of carbon dioxide gas into the air. On the other hand, as forest absorb a lot of carbondioxaide and deliver oxygen instead we destroy an important storehouse of carbon dioxide when we clear forest.

Radiation (রেডিএইশান) n.- emitting or causing to emit rays; রশ্নি বিচ্ছুরণ; syn- emanation। Orbit (অরবিট) n.- the curved course of a heavenly body, গ্রহ-নক্ষত্রাদির পরিক্রমণ পথ বা কক্ষ; syn-circle Concentration (কনসেনট্রেইশান) n. the amount of a substance in a liquid or in another substance, (দ্রবণের) পরিমাণ; syn- consolidation, ant- dilution, distraction. Enormous (ইনরম্যাস) adj.- very large in size, quantity or extent, প্রচুর/ বিশাল syn- huge, ant- meager, tiny। Pasture (পাসচ্যা(র) n.- grazing land, পশুচারণভূমি। Dual (ডিউঅ্যাল) adj.- two fild, double, expressing two things or persons; দ্বৈত, দ্বিগুণ; syn-coupled, duplicate। Absorb (অ্যাবস্য(র)র) v. to suck in, শুষে ফেলা, syn- in corporate, ant-dissipate. Deliver (ডিলিভার) v. to give প্রদান করা, syn- save. Instead (ইনসটেড) adv. as an alternative, পরিবর্তে বা বদলে syn- substitute Generate (জেন্যারেইট) v. to produce, or to bring into existence, উৎপাদন করা; syn- originate, ant- prevent। Fossil (ফস্স) n. a rock or mineral dug out of the earth, a relic of farmer living things preserved in the rocks, an attained person or thing, জীবাশ্ম। Fuel (ফিউঅ্যাল) n. material for a fire, জ্বালানি। Obtain (অবটেইন) v. to get or to gain something; পাওয়া বা অর্জন করা, syn- earn. 

1.     Choose the best answer from the alternatives.                                                               1×7=7

        a.     Man can control the effect of the greenhouse gases on ¾.

                (i) the atmosphere    (ii) the moon                (iii) the sun                  (iv) human being

        b.     Enormous areas of forests are destroyed ¾.

                (i) weekly                (ii) daily                       (iii) yearly                    (iv) monthly

        c.     At present about ¾ barrels of crude oil are used daily.

                (i) 8.5 million           (ii) 850 lakh                 (iii) 850 million            (iv) 85 lakh

        d.     Greenhouse gases are being produced all over the world by ¾

                (i) human beings      (ii) plants                     (iii) animals                  (iv) nature

        e.     A fossil raw material which is burned releases carbon dioxide into the ¾.

                (i) air                        (ii) soil                         (iii) oil                          (iv) water

        f.      Industrial activities are giving rise to ¾.

                (i) many factories    (ii) houses                    (iii) buildings               (iv) factories

        g.     Industrial factories require ¾.

                (i) air                        (ii) fire                         (iii) coal                       (iv) water

        h.     The greenhouse effect is strengthened by ¾.

                (i) forestation           (ii) deforestation          (iii) planting trees         (iv) using pesticides

        i.      Forests are destroyed every year by ¾.

                (i) animals                (ii) people                    (iii) goats and cows      (iv) forest officers

        j.      Factories produce energy through the combustion of ¾.

                (i) trees                    (ii) plants                     (iii) straw                     (iv) coal

 

2.     Answer the following questions.                                                                                  2×5 = 10

        a.     What’s the main cause of the increase in carbon dioxide level in the atmosphere?

        b.     What can a man control?

        c.     How the greenhouse effect is strengthened?

        d.     How many barrels of crude oil are used daily nowadays?

        e.     How do the factories produce energy?

        f.      What other purposes are coal and other sources of energy burned in?

        g.     By whom are more greenhouse gases generated worldwide?

        h.     What is deforestation?

        i.      Why do people destroy forests?

        j.      Why is the carbon dioxide storehouse destroyed with the forests?