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Saving the rainforests has been a classic environmental cause for

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Saving the rainforests has been a classic environmental cause for  [#permalink]

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Saving the rainforests has been a classic environmental cause for decades. Rainforests absorb large quantities of carbon dioxide from the air and make it suitable for human use. However, recent developments have started a debate that questions the endangered status of the rainforests. New “secondary” forests have been cropping up in tropical regions around the world. These new forests are growing in land that had been used for farming or logging but has lain fallow in recent years as farmers and rural dwellers migrate to the cities in search of better work and opportunities. Scientists are now debating the newfound benefits of the “secondary” forests and deciding whether they can be valid replacements for the old rainforest that is being destroyed daily.

The rainforests play a vital role in removing carbon dioxide, one of the main heat-trapping gasses and a major cause of global warming, from the air and turning it into oxygen by a process called photosynthesis. Photosynthesis occurs in two separate reactions. During the light reaction, chlorophyll and other pigments such as beta-carotene absorb slightly different lengths of light waves and transmit the energy to the central chlorophyll molecule. The energy collected from the light reaction is stored in molecules of ATP, which is similar in structure to the building blocks of human DNA. The ATP is used in the Calvin Cycle in combination with carbon dioxide to form complex sugars, giving off oxygen as a byproduct.

Some scientists believe that the new forests can supplement the waning number of rainforest foliage and absorb carbon dioxide in their place. One statistic says the new forests are replacing the destroyed areas at a rate of 50 to 1. Because of the heat and intense rainfall in these tropical areas, the new growth increases at an astounding rate and makes these new forests appear to the untrained eye as if they had flourished as rainforest for hundreds of years. Some scientists concerned with carbon emissions look at the emerging forests and conclude that they are suitable replacements. After all, the Mayans and other indigenous peoples cleared lands in the areas that are now clearly visible as lush rainforest.

Not all scientists agree that the “secondary” forests are a perfect solution. Although they agree that the new forestry can reduce carbon emissions, they argue that new forests do not possess all the same qualities as the primary rainforests. “Secondary” forests suffer from a notable difference in floristics and species diversity. Since the unused farmland is often situated hundreds of miles away from the native rainforests, species endangered by their destruction cannot benefit from the new growth in those areas. To this group of scientists, the ecosystems in the new forests are just not the same as those of a true rainforest.

1. Which of the following does the author suggest about species endangered by the destruction of the native rainforests?

A) They cannot reach the native rainforests from the new growth in unused farmland.

B) They cannot survive the journey from the native rainforests to the new forests.

C) They are not suited to the conditions in the new growth.

D) They cannot cope with human settlements that lie in their path to the new growth.

E) Animals must travel great distances in open farmland in order to move between native rainforests.

2. The third paragraph performs which of the following functions in the passage?

A) It refutes the evidence presented in the fourth paragraph.

B) It establishes the author's knowledgeability and, therefore, authority in this field of study.

C) It presents one side of a debate.

D) It supports the previous paragraphs by elaborating on the phenomenon described in the second paragraph.

E) It presents the new forests as a comprehensive solution to the rainforests problem.


3. According to the passage, what is one function of ATP?

A) It is part of the DNA molecule.

B) It creates complex sugars.

C) It stores the energy created in the light reaction.

D) It gives off oxygen as a byproduct.

E) It is used in the light reaction in combination with carbon dioxide to form complex sugars.


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Re: Saving the rainforests has been a classic environmental cause for  [#permalink]

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New post 18 Feb 2019, 01:59
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Re: Saving the rainforests has been a classic environmental cause for   [#permalink] 18 Feb 2019, 01:59
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