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Read the following passage and choose the answer that is closest to
each of
the questions that are based on the passage.
Bananas, apples, and
avocados continue to ripen after they are picked. Cherries, blackberries, and grapes
do not.
The difference between climacteric fruits (the former) and non-climacteric fruits
(the
latter) matters to fruit growers and greengrocers, who must make sure their wares
are in
tip-top condition when they arrive at the marketplace. But how those differences
originally
came about remains unclear.
Two biologists of the University of Tokyo
offer a
suggestion. Fruits, they observe, exist to solve a problem faced by all plants-how
best to
spread their progeny around. Wrapping their seeds in a sugary pulp to provide a
tasty meal
serves as a way to get animals to do this for them. They do, however, need to make
sure that
their fruits favour the animals most likely to do the distributing. The biologists
propose
that climacterism, or its absence, is a way to achieve this. If ground-dwelling
animals are
the main distributors, then the continuing ripening of fallen fruit (i.e.,
climacterism) is
beneficial. If, by contrast, those distributors are arboreal or aerial, and so can
feed on
unfallen fruit, then non-climacteric fruits will do well.
To test their
idea, the
two researchers studied 80 varieties of fruits, and noted which animals each
depended on for
its propagation. 35 of these fruits, eaten by both ground-dwelling animals and
arboreal or
aerial animals, were non-climacteric. Further, 15 of the 19 varieties eaten
principally by
ground-dwellers were climacteric, while 21 of the 26 fed on by arboreal or aerial
animals
were non-climacteric.
That is a suggestively strong correlation. And the
authors'
hypothesis is fortified by other evidence. They point out that non-climacteric
fruits tend
to have vivid colours, especially reds and purples. This may help them to stand out
amid the
foliage of their parent plants, advertising their presence. Climacteric fruits are
generally
better camouflaged. That makes them harder to spot until they have fallen to the
ground.
The main limitation of their work is that they looked at fruits
eaten by
people. This has probably contaminated the sample, for thousands of years of
selective
breeding for traits that human beings find appealing may have blurred any signal
optimised
by natural selection. The next step, therefore, should be the analysis of wild
fruits.
Question 3 : Which one of the following options means "arboreal" and "camouflage"?
Coming Soon
Option 1: This option is correct. Arboreal means "tree-dwelling"
(derived from Latin arbor = tree). The passage uses it to describe animals like
monkeys or birds that live in trees. Camouflage means "disguised", to blend into
their environment (e.g., harder to spot on foliage until they fall).
Option 2: This option is incorrect. "Ground-dwelling" means living on the ground
which contradicts "arboreal" (tree-related).
Option 3: This option is incorrect. "Protected" and "fortified" are unrelated to
either term. The passage discusses concealment, not physical protection.
Option 4: This option is incorrect. "Variegated" means colour variation, not
disguise.
Choice A is the correct answer.
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