What is the main topic of the passage?
A. The relationship between a plant's roots and its shoots
B. How plants can be grown without roots
C. What can be learned by growing roots in isolation
D. What elements are necessary for the growth of isolation
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Chọn đáp án C
Kiến thức đọc hiểu
Chủ đề chính của đoạn văn là gì?
A. Mối quan hệ giữa rễ cây và chồi của nó
B. Làm thế nào cây trồng được mà không cần rễ
C. Có thể học được gì bằng cách trồng rễ cách ly
D. Những yếu tố nào cần thiết cho sự phát triển của cách li
- Tom: “Can I bring a friend to your birthday party?"
- Kyle: “The more the merrier."
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions
Most of the female football players will be jobless when the Games are over
The use of the phrase “come in handy” indicates that the process is ______
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
When the town was ________ built, a small airport was included for the convenience of local people
Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges
Pat and Anne are meeting at the class get-together
- Pat: "Your hairstyle is terrific, Anne”
- Anne: “__________________”
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
About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and the usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require energy, of course. The process of respiration uses sugar to make the high energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen.
The study of isolated roots has provided an understanding of the relationship between shoots and roots in intact plants. The leaves of the shoots provide the roots with sugar and vitamins, and the roots provide the shoots with water and minerals. In addition, roots can provide the shoots with organic nitrogen compounds. This comes in handy for the growth of buds in the early spring when leaves are not yet functioning. Once leaves begin photosynthesizing, they produce protein, but only mature leaves can "export" protein to the rest of the plant in the form of amino acids.
According to the passage, what is ATP?
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions
They think that someone started the fire on purpose
