Biology 9700/22 — October/November 2020
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Cell Structure · Transport in Mammals · Transport in Plants · Infectious Diseases · Nucleic Acids and Protein Synthesis · Gas Exchange · +5 more
Fig. 1.1 is a diagram drawn from a photomicrograph of a transverse section through part of a leaf.
The arrows in Fig. 1.1 show the movement of water through the cells of the leaf after it has left the xylem.
Water from the xylem can enter cell A and then moves to cells B and C without crossing their cell walls.
The cell structures through which water passes from cell A to cell B are not visible in Fig. 1.1.
Name the cell structures through which water passes from cell A to cell B without crossing their cell walls.
Explain what causes water to move from cell B to cell C.
Name the pathway taken by water between cell A and cell C.
Most of the water that arrives at the leaf passes to the external atmosphere.
With reference to Fig. 1.1, describe and explain the sequence of events occurring between point P and point Q.
The actual diameter of cell D in Fig. 1.1 along the length X–Y is .
Calculate the magnification of the image.
Write down the formula used to make your calculation. Show your working.
formula
answer = ______
The rest of this paper
5 more questions- Q2Infectious Diseases · Nucleic Acids and Protein Synthesis13M
- Q3Gas Exchange · Transport in Mammals7M
- Q4Cell Structure · The Mitotic Cell Cycle · Immunity15M
- Q5Biological Molecules · Enzymes7M
- Q6Transport in Mammals · Cell Membranes and Transport8M