Câu hỏi:
19/03/2020 270Read the following passage and mark the letter A, B, C ,or D on your answer sheet to indicate the correct answer for 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 Line 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.
The author mentions the trail pheromone of the leafcutter ant in line 11 to point out
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:
A
Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở dòng 11 để chỉ ra
A. cần rất ít Pheromone để đánh dấu một dấu vết
B. các loại pheromones khác nhau mà kiến có thể sản sinh
C. một loại kiến phổ biến ở nhiều nơi trên thế giới
D. Một số kiến có thể sản sinh đến một miligam pheromone
=> đáp án A
Thông tin: 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
Đã bán 152
Đã bán 114
Đã bán 132
Đã bán 47
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Choose the answer among A, B, C, D to complete each of the sentences below:
Up to now, the teacher _______ our class five tests.
Câu 2:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning
“I will pay back the money, Gloria.” Said Ivan.
Câu 3:
Choose the answer among A, B, C, D to complete each of the sentences below:
It was …… easy for him to learn baseball because he had been a cricket player.
Câu 4:
Choose the answer among A, B, C, D to complete each of the sentences below:
Sam’s uncle, ______ is very rich, came to visit our orphanage.
Câu 5:
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
Caroline has worn her new yellow dress only once since she buys it.
Câu 6:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning
It started to rain at 2 o’clock and it is still raining.
Câu 7:
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.
- Lisa: “Have you been able to reach Peter?” - Gina: “……………”
về câu hỏi!