Soal Latihan dan Jawaban Reading Comprehension 18

Monday, March 19th, 2012 - reading comprehension

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

(5)  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

(10)  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,

(15)  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.

(20)  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.

 

Reading Comprehension 18

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Question 1
What does the passage mainly discuss?
A
The mass migration of ants
B
The information contained in pheromones
C
Different species of ants around the world
D
How ants mark and follow a chemical trail
Question 2
The word “forage” in line 1 is closest in meaning to
A
walk toward
B
search for food
C
look up
D
revolve around
Question 3
The word “intermittently” in live 4 is closest in meaning to
A
rapidly
B
periodically
C
incorrectly
D
roughly
Question 4
The phrase “the one” in line 8 refers to a single
A
dead ant
B
message
C
food trail
D
species
Question 5
According to the passage, why do ants use different compounds as trail pheromones?
A
To indicate how far away the food is
B
To protect their trail from other species
C
To attract different types of ants
D
To reduce their sensitivity to some chemicals
Question 6
The author mentions the trail pheromone of the leafcutter ant in line 11 to point out
A
a type of ant that is common in many parts of the world
B
the different types of pheromones ants can produce
C
that certain ants can produce up to one milligram of pheromone
D
how little pheromone is needed to mark a trail
Question 7
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 follow an ant who is familiar with the trail
D
They concentrate on the smell of food.
Question 8
The word “furnish” in line 16 is closest in meaning to
A
cover
B
select
C
provide
D
include
Question 9
The word “oscillating“ in line 17 is closest in meaning to
A
falling
B
depositing
C
starting
D
swinging
Question 10
According to the passage, the highest amount of pheromone vapor is found
A
in the source of food
B
in the receptors of the ants
C
just above the trail
D
under the soil along the trail
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