Question

[Dương Minh]

Read 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.

According to the passage, how are ants guided by trail pheromones?

A. They sense the vapor through their antennae.

B. They avoid the vapor spaces by moving in a straight line.

C. They concentrate on the smell of food.

D. They follow an ant who is familiar with the trail

Answer 1

[Nguyen Hoang Hai]

A

Kiến thức: Đọc hiểu

Giải thích:

Theo đoạn văn, kiến được hướng dẫn bằng pheromone như thế nào?

A. chúng có thể cảm nhận hơi qua ăngten của chúng.

B. chúng tránh không gian hơi bằng cách di chuyển theo một đường thẳng.

C. chúng tập trung vào mùi thức ăn.

D. chúng đi theo một con kiến quen thuộc với dấu vết

Thông tin: 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.