Câu hỏi:
01/05/2022 274Read 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 35 to 42
Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.
Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta Texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.
The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space. The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.
What does the passage mainly discuss?
Sách mới 2k7: Tổng ôn Toán, Lí, Hóa, Văn, Sử, Địa…. kỳ thi tốt nghiệp THPT Quốc gia 2025, đánh giá năng lực (chỉ từ 110k).
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Trả lời:
Đoạn văn chủ yếu thảo luận về vấn đề gì?
A. Sự di cư hàng loạt của kiến
B. Làm thế nào kiến đánh dấu và theo một dấu vết hóa học
C. Các loài kiến khác nhau trên khắp thế giới
D. Thông tin chứa trong pheromone
Đáp án B
How ants mark and follow a chemical trail = Cách kiến ra dấu và đi theo một vệt hóa chất
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
“Did you enjoy your picnic?” – Yes, we had a great time and on the way home, we stopped ___ the sunset”
Câu 2:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The Smiths have been ___ guilty of kidnapping their neighbor’s child and have been sentenced to ten years in prison.
Câu 3:
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.
It started to rain at 2 o’clock and it is still raining.
Câu 4:
Câu 5:
At first, Mark thought it would be great to build his own ranch, but he was forced to _______ the idea when the bank refused to give him a loan.
Câu 6:
It’s no wonder the children felt disappointed because first their parents promised to take them to Disneyland and then they______ on their word.
Câu 7:
I don’t mind waiting for other ten minutes, but will you please keep me company?
về câu hỏi!