1/3/2023 0 Comments Bunni how we first met goneAs the ant moves to the right, its left antenna arrives in the vapor space. In following the trail, the ant moves to the right and left, oscillatingfrom side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. 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. It then swings back to the right, and so weaves back and forth down the trailĪccording to the passage, the highest amount of pheromone vapor is found _ 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. 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. Ants can be extremely sensitive to these signals. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Unlike some other messages, such as the onearising from a dead ant, a food trail has to be kept secret from members of other species. These trails incorporate no directional information and may be followed by other ants in either direction. As a worker ant returns home after finding a source of food, it marks the route by intermittentlytouching 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. 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. 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 from 35 to 42
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |