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Canadian writer Jay Ingram investigates the mystery of why leaves turn red in the fall
1One of the most captivating natural events of the year in many areas throughout North America is the turning of the leaves in the fall. 2The colours are magnificent, but the question of exactly why some trees turn yellow or orange, and others red or purple, is something which has long puzzled scientists.
1Summer leaves are green because they are full of chlorophyll, the molecule that captures sunlight and converts that energy into new building materials for the tree. 2As fall approaches in the northern hemisphere, the amount of solar energy available declines considerably. 3For many trees – evergreen conifers being an exception – the best strategy is to abandon photosynthesis until the spring. 4So rather than maintaining the now redundant leaves throughout the winter, the tree saves its precious resources and discards them. 5But before letting its leaves go, the tree dismantles their chlorophyll molecules and ships their valuable nitrogen back into the twigs. 6As chlorophyll is depleted, other colours that have been dominated by it throughout the summer begin to be revealed. 7This unmasking explains the autumn colours of yellow and orange, but not the brilliant reds and purples of trees such as the maple or sumac.
1The source of the red is widely known: it is created by anthocyanins, water-soluble plant pigments reflecting the red to blue range of the visible spectrum. 2They belong to a class of sugar-based chemical compounds also known as flavonoids. 3What’s puzzling is that anthocyanins are actually newly minted, made in the leaves at the same time as the tree is preparing to drop them. 4But it is hard to make sense of the manufacture of anthocyanins – why should a tree bother making new chemicals in its leaves when it’s already scrambling to withdraw and preserve the ones already there?
1Some theories about anthocyanins have argued that they might act as a chemical defense against attacks by insects or fungi, or that they might attract fruit-eating birds or increase a leaf’s tolerance to freezing. 2However, there are problems with each of these theories, including the fact that leaves are red for such a relatively short period that the expense of energy needed to manufacture the anthocyanins would outweigh any anti-fungal or anti-herbivore activity achieved.
1It has also been proposed that trees may produce vivid red colours to convince herbivorous insects that they are healthy and robust and would be easily able to mount chemical defences against infestation. 2If insects paid attention to such advertisements, they might be prompted to lay their eggs on a duller, and presumably less resistant host. 3The flaw in this theory lies in the lack of proof to support it. 4No one has as yet ascertained whether more robust trees sport the brightest leaves, or whether insects make choices according to colour intensity.
1Perhaps the most plausible suggestion as to why leaves would go to the trouble of making anthocyanins when they’re busy packing up for the winter is the theory known as the ‘light screen’ hypothesis. 2It sounds paradoxical, because the idea behind this hypothesis is that the red pigment is made in autumn leaves to protect chlorophyll, the light-absorbing chemical, from too much light. 3Why does chlorophyll need protection when it is the natural world’s supreme light absorber? 4Why protect chlorophyll at a time when the tree is breaking it down to salvage as much of it as possible?
1Chlorophyll, although exquisitely evolved to capture the energy of sunlight, can sometimes be overwhelmed by it, especially in situations of drought, low temperatures, or nutrient deficiency. 2Moreover, the problem of oversensitivity to light is even more acute in the fall, when the leaf is busy preparing for winter by dismantling its internal machinery. 3The energy absorbed by the chlorophyll molecules of the unstable autumn leaf is not immediately channelled into useful products and processes, as it would be in an intact summer leaf. 4The weakened fall leaf then becomes vulnerable to the highly destructive effects of the oxygen created by the excited chlorophyll molecules.
1Even if you had never suspected that this is what was going on when leaves turn red, there are clues out there. 2One is straightforward: on many trees, the leaves that are the reddest are those on the side of the tree which gets most sun. 3Not only that, but the red is brighter on the upper side of the leaf. 4It has also been recognised for decades that the best conditions for intense red colours are dry, sunny days and cool nights, conditions that nicely match those that make leaves susceptible to excess light. 5And finally, trees such as maples usually get much redder the more north you travel in the northern hemisphere. 6It’s colder there, they’re more stressed, their chlorophyll is more sensitive and it needs more sunblock.
1What is still not fully understood, however, is why some trees resort to producing red pigments while others don’t bother, and simply reveal their orange or yellow hues. 2Do these trees have other means at their disposal to prevent overexposure to light in autumn? 3Their story, though not as spectacular to the eye, will surely turn out to be as subtle and as complex.
Reading Passage has nine paragraphs, A-l.
Which paragraph contains the following information?
Write the correct letter, A-l, in boxes 14-18 on your answer sheet.
NB You may use any letter more than once.
14 a description of the substance responsible for the red colouration of leaves
15 the reason why trees drop their leaves in autumn
16 some evidence to confirm a theory about the purpose of the red leaves
17 an explanation of the function of chlorophyll
18 a suggestion that the red colouration in leaves could serve as a warning signal
Complete the notes below.
Choose ONE WORD ONLY from the passage for each answer.
Write your answers in boxes 19-22 on your answer sheet.
Why believe the ‘light screen’ hypothesis?
Do the following statements agree with the information given in Reading Passage 2?
In boxes 23-25 on your answer sheet, write
TRUE if the statement agrees with the information
FALSE if the statement contradicts the information
NOT GIVEN if there is no information on this
23 It is likely that the red pigments help to protect the leaf from freezing temperatures.
24 The ‘light screen’ hypothesis would initially seem to contradict what is known about chlorophyll.
25 Leaves which turn colours other than red are more likely to be damaged by sunlight.
Choose the correct letter A, B, C or D.
Write the correct letter in box 26 on your answer sheet.
For which of the following questions does the writer offer an explanation?
A why conifers remain green in winter
B how leaves turn orange and yellow in autumn
C how herbivorous insects choose which trees to lay their eggs in
D why anthocyanins are restricted to certain trees