Biology 5090/22 — May/June 2013
Cambridge O-Level · Theory · worked solutions for every part, with the mark scheme
Topics Plant Nutrition · Transport in Humans · Human Nutrition · Excretion · Inheritance · Coordination and Control · +7 more
Fig. 1.1 shows a vertical section through a pair of guard cells and some other cells on the lower surface of a leaf.
Name the type of cell labelled A on Fig. 1.1.
______
Draw an arrow on Fig. 1.1 to show the position of the stoma.
Fig. 1.1 shows the guard cells as they appear at 1300 hours. In the space below, draw a diagram to show the guard cells, in surface view, as they would appear at 0100 hours.
On your diagram, draw and label the structural features of one of the guard cells.
Explain the advantage to the plant of the difference in the guard cells at 1300 hours and at 0100 hours.
1300 hours ______
0100 hours ______
The rest of this paper
8 more questions- Q2Human Nutrition · Excretion · Human Gas Exchange10M
- Q3Organisms and Their Environment · Inheritance · Plant Nutrition11M
- Q4Excretion · Transport in Humans9M
- Q5Biotechnology and Genetic Modification · Enzymes9M
- Q6Plant Nutrition · Sexual Reproduction in Plants · Inheritance10M
- Q7Human Nutrition · Coordination and Control · Transport in Humans10M
- Q8Coordination and Control10M
- Q9Transport in Humans · Disease and Immunity10M