Câu hỏi:
24/04/2020 296Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions
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: 30 đề đánh giá năng lực DHQG Hà Nội, Tp. Hồ Chí Minh, BKHN 2025 mới nhất (600 trang - chỉ từ 160k).
Quảng cáo
Trả lời:
C
Kiến thức: Đọc hiểu
Giải thích:
Đoạn văn chủ yếu thảo luận gì?
A. Thông tin chứa trong pheromones
B. Sự di cư rất đông của kiến
C. Làm thế nào kiến đánh dấu và đi theo một dấu vết hóa học
D. Các loài kiến khác nhau trên thế giới
Đã bán 152
Đã bán 114
Đã bán 132
Đã bán 47
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
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
He was such a wet blanket at the party tonight!
Câu 2:
Mark the letter A, B, C, or D on your answer sheet to intricate the correct answer to each of the following questions.
You haven't eaten anything since yesterday afternoon. You ______ be really hungry!
Câu 3:
Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions
If you have some sufficient knowledge of English, you can make yourself understand almost everywhere.
Câu 4:
Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions
Exceeding speed limits and fail to wear safety belts are two common causes of automobile death.
Câu 5:
Mark the letter A, B, C, or D on your answer sheet to intricate the correct answer to each of the following questions
The pair of jeans I bought for my son didn't fit him, so I went to the store and asked for ______.
Câu 6:
Mark the letter A, B, C, or D on your answer sheet to intricate the correct answer to each of the following questions
Pumpkin seeds, ______ protein and iron, are a popular snack.
Câu 7:
Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the rest in the pronunciation of the underlined part in each of the following questions
về câu hỏi!