Câu hỏi:
30/03/2020 527Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
PHOTOSYNTHESIS
Almost all living things ultimately get their energy from the sun. In a process called photosynthesis, plants, algae, and some other organisms capture the sun's energy and use it to make simple sugars such as glucose. Most other organisms use these organic molecules as a source of energy. Organic materials contain a tremendous amount of energy. As food, they fuel our bodies and those of most other creatures. In such forms as oil, gas, and coal, they heat our homes, run our factories and power our cars.
Photosynthesis begins when solar energy is absorbed by chemicals called photosynthetic pigments that are contained within an organism. The most common photosynthetic pigment is chlorophyll. The bright green color characteristic of plants is caused by it. Most algae have additional pigments that may mask the green chlorophyll. Because of these pigments, algae may be not only green but brown, red, blue or even black.
In a series of enzyme-controlled reactions, the solar energy captured by chlorophyll and other pigments is used to make simple sugars, with carbon dioxide and water as the raw materials. Carbon dioxide is one of very few carbon- containing molecules not considered to be organic compounds. Photosynthesis then converts carbon from an inorganic to an organic form. This is called carbon fixation. In this process, the solar energy that was absorbed by chlorophyll is stored as chemical energy in the form of simple sugars like glucose. The glucose is then used to make other organic compounds. In addition, photosynthesis produces oxygen gas. All the oxygen gas on earth, both in the atmosphere we breathe and in the ocean, was produced by photosynthetic organisms. Photosynthesis constantly replenishes the earth's oxygen supply.
Organisms that are capable of photosynthesis can obtain all the energy they need from sunlight and do not need to eat. They are called autotrophs. Plants are the most familiar autotrophs on land. In the ocean, algae and bacteria are the most important autotrophs. Many organisms cannot produce their own food and must obtain energy by eating organic matter. These are called heterotrophs.
Advances in Photosynthesis and Respiration, Hardback.1990.
The word “fuel” is similar in meaning to ______.
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Trả lời:
Giải bởi Vietjack
Kiến thức: Đọc hiểu
Giải thích:
Từ "fuel" có nghĩa tương tự như ______.
A. cung cấp chất dinh dưỡng cho B. sản xuất vật liệu hữu cơ
C. cung cấp nhiên liệu cho D. giúp thực hiện chức năng
Từ fuel ở đây mang nghĩa “cung cấp chất dinh dưỡng cho”: Organic materials contain a tremendous amount of energy. As food, they fuel our bodies and those of most other creatures.’
Tạm dịch: Vật liệu hữu cơ chứa một lượng năng lượng rất lớn. Là thức ăn, chúng cung cấp dinh dưỡng cho cơ thể chúng ta và của hầu hết các sinh vật khác.
Chọn A
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) or phrase(s) CLOSEST in meaning to the underlined part in each of the following questions.
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Câu 2:
Mark the letter A, B, C or D on your answer sheet to indicate the word(s) or phrase(s) OPPOSITE in meaning to the underlined part in each of the following questions.
The distinction between schooling and education implied by this remark is important.
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Câu 3:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
If only he _______ accept some help with the work instead of trying to do it alone!
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Câu 4:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Over the last few months garages _________ the price of petrol three times.
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Câu 5:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
_______, he couldn’t finish that test in 60 minutes.
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Câu 6:
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
The children had such difficult time when they began school in their new neighborhood that their parents decided never to move again.
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Câu 7:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
I am not sure how old he is but he must be _________ for 70.
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