PTE Academic Listening: MCQ – Choose Single Answer Practice Test 07

PTE Academic Listening (Multiple-choice, Choose Single Answer) Practice Test 07

Multiple-choice, choose single answer – Listen to the recording and answer the multiple-choice question by selecting the correct response. Only one response is correct. This item type assesses listening skills.

This is a multiple-choice item type that assesses listening skills. It requires test takers to listen to, analyze, understand and assess a short recording on an academic subject and choose a single correct response.

Answers are also given.

PTE Listening: Multiple-choice, choose single answer

PTE Academic Listening: MCQ - Choose Single Answer Practice Test 07

PTE Academic Listening: MCQ – Choose Single Answer Practice Test 07

Listen to the audio and answer the following question #1 

Ques: Which of the following best expresses the main idea of the passage?

[A]. Current theories regarding the structure of the Earth’s mantle cannot account for new discoveries regarding the composition of mantle xenoliths.
[B]. There are conflicting hypotheses about the heterogeneity of the Earth’s mantle because few mantle elements have been thoroughly studied.
[C]. Further research is needed to resolve the debate among geologists over the
composition of the mid-ocean ridge system.
[D]. There is clear-cut disagreement within the geological community over the
structure of the Earth’s mantle.

FOR ANSWER: CLICK HERE
[D]

Note: This transcript is given for your reference purpose only. It will not be given in PTE Academic examination.

TRANSCRIPT

Geologists have long known that the Earth’s mantle is heterogeneous, but its spatial arrangement remains unresolved—is the mantle essentially layered or irregularly heterogeneous?

The best evidence for the layered mantle thesis is the well-established fact that volcanic rocks found on oceanic islands, islands believed to result from mantle plumes arising from the lower mantle, are composed of material fundamentally different from that of the mid-ocean ridge system, whose source, most geologists contend, is the upper mantle.

Some geologists, however, on the basis of observations concerning mantle xenoliths, argue that the mantle is not layered, but that heterogeneity is created by fluids rich in “incompatible elements” (elements tending toward liquid rather than solid state) percolating upward and transforming portions of the upper mantle irregularly, according to the vagaries of the fluids’ pathways. We believe, perhaps unimaginatively, that this debate can be resolved through further study, and that the underexplored midocean ridge system is the key.

Listen to the audio and answer the following question #2 

Note: This transcript is given for your reference purpose only. It will not be given in PTE Academic examination.

TRANSCRIPT

One of the questions of interest in the study of the evolution of spiders is whether the weaving of orb webs evolved only once or several times.

About half the 35,000 known kinds of spiders make webs; a third of the web weavers make orb webs. Since most orb weavers belong either to the Araneidae or the Uloboridae families, the origin of the orb web can be determined only by ascertaining whether the families are related.

Recent taxonomic analysis of individuals from both families indicates that the families evolved from different ancestors, thereby contradicting Wiehle’s theory. This theory postulates that the families must be related, based on the assumption that complex behavior, such as web building, could evolve only once. According to Kullman, web structure is the only characteristic that suggests a relationship between families. The families differ in appearance, structure of body hair, and arrangement of eyes. Only Uloborids lack venom glands. Further identification and study of characteristic features will undoubtedly answer the question of the evolution of the orb web.

Ques: The primary purpose of the passage is to:

[A]. settle the question of whether orb webs evolved once or more than once.
[B]. describe scientific speculation concerning an issue related to the evolution of orb webs.
[C]. analyze the differences between the characteristic features of spiders in the Araneidae and Uloboridae families.
[D]. question the methods used by earlier investigators of the habits of spiders.

FOR ANSWER: CLICK HERE
[B]
PTE Academic Listening: MCQ – Choose Single Answer Practice Test 07
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