Questions 1-5
Which paragraph (A-I) contains the following information?
NB You may use any letter more than once.
1. a description of the substance responsible for the red colouration of leaves
2. the reason why trees drop their leaves in autumn
3. some evidence to confirm a theory about the purpose of the red leaves
4. an explanation of the function of chlorophyll
5. a suggestion that the red colouration in leaves could serve as a warning signal
Questions 6-9
Complete the notes. Write ONE WORD ONLY from the text in each gap.
Why believe the ‘light screen’ hypothesis?
Questions 10-12
Choose TRUE if the statement agrees with the information given in the text, choose FALSE if the statement contradicts the information, or choose NOT GIVEN if there is no information on this.
10. It is likely that the red pigments help to protect the leaf from freezing temperatures.
11. The ‘light screen’ hypothesis would initially seem to contradict what is known about chlorophyll.
12. Leaves which turn colours other than red are more likely to be damaged by sunlight.
Question 13
Choose the correct answer.
For which of the following questions does the writer offer an explanation?
