Academic Reading Practise Test

Examine the elephant communication reading passage along with answers and explanations to prepare for your IELTS reading test. This reading passage has 13 questions with three different question types such as diagram labelling, summary completion, and multiple choice questions.

Elephant Communication

Read the passage carefully and answer all the questions (28 - 40) given below. For answers, refer to the table given below.

Passage

A. A postdoctoral fellow at Stanford University, O’Connell Rodwell has come to Namibia’s premiere wildlife sanctuary to explore the mysterious and complex world of elephant communication. She and her colleagues are part of a scientific revolution that began nearly two decades ago with the stunning revelation that elephants communicate over long distances using low-frequency sounds, also called infrasounds, that are too deep to be heard by most humans.

B. As might be expected, the African elephant’s ability to sense seismic sound may begin in the ears. The hammer bone of the elephant’s inner ear is proportionally very large for a mammal, but typical for animals that use vibrational signals. It may therefore be a sign that elephants can communicate with seismic sounds. Also, the elephant and its relative the manatee are unique among mammals in having reverted to a reptilian-like cochlear structure in the inner ear. The cochlea of reptiles facilitates a keen sensitivity to vibrations and may do the same in elephants.

C. But other aspects of elephant anatomy also support that ability. First, then enormous bodies, which allow them to generate low-frequency sounds almost as powerful as those of a jet takeoff, provide ideal frames for receiving ground vibrations and conducting them to the inner ear. Second, the elephant’s toe bones rest on a fatty pad that might help focus vibrations from the ground into the bone. Finally, the elephant’s enormous brain lies in the cranial cavity behind the eyes in line with the auditory canal. The front of the skull is riddled with sinus cavities that may function as resonating chambers for vibrations from the ground.

D. How the elephants sense these vibrations is still unknown, but O’Connell Rodwell who just earned a graduate degree in entomology at the University of Hawaii at Manoa, suspects the pachyderms are “listening” with their trunks and feet. The trunk may be the most versatile appendage in nature. Its uses include drinking, bathing, smelling, feeding and scratching. Both trunk and feet contain two kinds of pressure-sensitive nerve endings—one that detects infrasonic vibrations and another that responds to vibrations with slightly higher frequencies. For O’Connell-Rodwell, the future of the research is boundless and unpredictable: “Our work is really at the interface of geophysics, neurophysiology and ecology,” she says. “We’re asking questions that no one has really dealt with before.”

E. Scientists have long known that seismic communication is common in small animals, including spiders, scorpions, insects and a number of vertebrate species such as white-lipped frogs, blind mole rats, kangaroo rats and golden moles. They also have found evidence of seismic sensitivity in elephant seals—2-ton marine mammals that are not related to elephants. But O’Connell Rodwell was the first to suggest that a large land animal also is sending and receiving seismic messages.

O’Connell Rodwell noticed something about the freezing behavior of Etosha’s six-ton bulls that reminded her of the tiny insects back in her lab. “I did my masters thesis on seismic communication in planthoppers,” she says. “I’d put a male planthopper on a stem and play back a female call, and the male would do the same thing the elephants were doing: He would freeze, then press down on his legs, go forward a little bit, then freeze again. It was just so fascinating to me, and it’s what got me to think, maybe there’s something else going on other than acoustic communication.”
   
F. Scientists have determined that an elephant’s ability to communicate over long distances is essential for its survival, particularly in a place like Etosha, where more than 2,400 savanna elephants range over an area larger than New Jersey. The difficulty of finding a mate in this vast wilderness is compounded by … elephant reproductive biology. Females breed only when nestrus a period of sexual arousal that occurs every two years and lasts just a few days. “Females in estrus make these very low, long calls that bulls home in on, because it’s such a rare event,” O’Connell-Rodwell says.

These powerful estrus calls carry more than two miles in the air and may be accompanied by long-distance seismic signals, she adds. Breeding herds also use low-frequency vocalizations to warn of predators. Adult bulls and cows have no enemies, except for humans, but young elephants are susceptible to attacks by lions and hyenas. When a predator appears, older members of the herd emit intense warning calls that prompt the rest of the herd to clump together for protection, then lee.

In 1994, O’Connell-Rodwell recorded the dramatic cries of a breeding herd threatened by lions at Mushara. “The elephants got really scared, and the matriarch made these very powerful warning calls, and then the herd took off screaming and trumpeting,” she recalls. “Since then, every time we’ve played that particular call at the water hole, we get the same response the elephants take off.”

G. Reacting to a warning call played hi the air is one thing, but could the elephants detect calls transmitted only through the ground? To find out, the research team in 2002 devised an experiment using electronic equipment that allowed them to send signals through the ground at Mushara. The results of our 2002 study showed US that elephants do indeed detect warning calls played through the ground,” O’Connell Rodwell observes.

“We expected them to clump up into tight groups and leave the area, and that’s in fact what they did. But since we only played back one type of call, we couldn’t really say whether they were interpreting it correctly. Maybe they thought it was a vehicle or something strange instead of a predator warning.” H. An experiment last year was designed to solve that problem by using three different recordings—the 1994 warning call from Mushara, an anti-predator call recorded by scientist Joyce Poole in Kenya and an artificial warble tone.

Although still analyzing data from this experiment, O’Connell Rodwell is able to make a few preliminary observations: “The data I’ve seen so far suggest that the elephants were responding like I had expected, when the ’94 warning call was played back, they tended to clump together and leave the water hole sooner. But what’s really interesting is that the unfamiliar anti-predator call from Kenya also caused them to clump up, get nervous and aggressively rumble—but they didn’t necessarily leave. I didn’t think it was going to be that clear cut.

Questions

Questions 28-31

Complete the following summary of the paragraphs of Reading Passage, using NO MORE THAN THREE WORDS from the Reading Passage for each answer.
Write your answers in boxes 28-31 on your answer sheet.

 

Questions 32-38

Complete the following summary of the paragraphs of Reading Passage, using NO MORE THREE WORDS OR A NUMBER from the Reading Passage for each answer.

Write your answers in boxes 32-38 on your answer sheet.

The way in which the elephants sense these sound vibrations is still not known, however O’Connell Rodwell, a freshly graduated student of entomology from the University of Hawaii, suggests that the elephants are “listening” with their 32 _______ by two different types of nerve endings - that reacts to vibrations with both 33_______ frequency with a little higher frequencies. The work of O'Connell Rodwell combines geophysics, neurophysiology, and 34 ________ It was also the first to show that a huge land animal is also sending and receiving 35_________. By using a male planthopper communicative approach other than 36________, O'Connell-Rodwell noticed the freezing behaviour. Scientists have determined that an elephant's communication ability over long distances is critical, especially when herds of elephants are searching for 37 ________ or warning of predators. Finally, the findings of our 2002 study revealed that elephants can detect warning calls played through the 38 ________.

Questions 39 & 40

39.  By using three separate recordings in the text, what is the author's perspective on the   experiment?

1. the data was not acquired with great clarity
2. the result is unquestionably different from the initial expectation
3. The outcome may be unfamiliar to the general audience
4. the result can be somewhat inaccurate or undecided.

40. The passage concludes that an elephant must communicate over great distances in order to survive.

1. When baby elephants encounter people.
2. When a dangerous predator shows up.
3. during an elephant male's estrus.
4. When elder herd members desire to break away from the group.

Solution Table

28. HAMMER	32. TRUNKS AND FEET	36. ACOUSTIC COMMUNICATION/ COMMUNICATIONS	40. C
29. BODY	33. INFRASONIC	37. MATE
30. PAD	34. ECOLOGY	38. GROUND
31. CAVITIES/ SINUS CAVITIES	35. SEISMIC MESSAGES	39. A