1963
SCOTTISH CERTIFICATE OF EDUCATION
Biology
Ordy
SCIENCE
Biology
Ordinary Grade
Wednesday, 1st May—-9.30 a.m. to 12 noon
Answer any FIVE questions.
Answers should be illustrated by labelled diagrams of
reasonable size wherever these help to clarify the
answers.
Marks may be deducted for bad spelling and bad
punctuation, and for writing that is difficult to read.
The value attached to each question, or to each part of
a question, is shown in the margin.
Marks
I. This question is printed on a separate sheet of paper on which you are
requested to write your answer. If you attempt this question, pin the sheet
inside your answer book, when completed. (20)
2' Name an insect-pollinated flower and make a labelled drawing of the flower
cut lengthwise. Describe briefly how pollination is effected. (8)
Outline what happens from the time a pollen grain is deposited on the stigma
until fertilization has occurred. (7)
^ hat experiments would you carry out to show the part played by the stamens
m the production of the fruit ? (5)
^ hat gases enter and leave a leaf through the stomata when photosynthesis is
proceeding rapidly ? Give reasons for your answer. (5)
en*Kl diagrams describe guard cells and say how their structure
3 es t‘lein to control the opening and closing of the stomata. (11)
Describe an experiment to find out whether there are more stomata on one
side of a leaf than the other. (4)
[ 101 ]