Question

[Dương Minh]

* Read 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 questions from 24 to 30.

  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.

(Hooked on TOEFL Reading - LinguaForum)

Which of the following is true about heterotrophs?

A. They require more energy than autotrophs.

B. They are not reliant on simple sugars for energy.

C. They cannot exist without the presence of autotrophs.

D. They are mostly land-bound organisms.

Answer 1

[Nguyen Hoang Hai]

ĐÁP ÁN C

Câu đề bài: Điều nào sau đây nói đúng về heterotrophs: sinh vật dị dưỡng?

 Đáp án C: Chúng không thể tồn tại mà không có sự hiện diện của autotrophs: sinh vật tự dưỡng.

Các đáp án còn lại:

A. Chúng đòi hỏi nhiều năng lượng hơn là sinh vật tự dưỡng.

B. Chúng không phụ thuộc vào các loại đường đơn cho năng lượng.

D. Chúng chủ yếu là các sinh vật gắn liền với đất liền.

Thông tin trong bài:

Many organisms cannot produce their own food and must obtain energy by eating organic matter. These are called heterotrophs. - Nhiều sinh vật không thể tự sản xuất thức ăn của mình và phải có năng lượng bằng cách ăn các chất hữu cơ. Chúng được gọi là sinh vật dị dưỡng.