Cambridge International A Level Biology Revision Guide

Chapter 13: Photosynthesis
End-of-chapter questions
1 What are the products of the light dependent reactions of photosynthesis?
A ATP, RuBP and reduced NAD
B ATP, oxygen and reduced NADP
C GP, oxygen and reduced NAD
D GP, reduced NADP and RuBP [1]
2 Where in the chloroplast are the products of photophosphorylation used?
A envelope
B granum
C stroma
D thylakoid [1]
3 In separate experiments, an actively photosynthesising plant was supplied with one of two labelled reactants:
water containing the 18 O isotope of oxygen
carbon dioxide containing the 17 O isotope of oxygen.
In which products of photosynthesis would these isotopes be found?
18 O 17 O
A oxygen produced by chloroplast grana carbohydrate produced by the chloroplast stroma
B oxygen produced by the chloroplast stroma carbohydrate produced by chloroplast grana
C carbohydrate produced by chloroplast grana oxygen produced by the chloroplast stroma
D carbohydrate produced by the chloroplast stroma oxygen produced by chloroplast grana
[1]
297
4 a Explain how the inner membrane system of a chloroplast makes it well adapted for photosynthesis. [5]
b Copy the table below and insert ticks or crosses to show which structural features are shared by a plant
chloroplast and a typical prokaryotic cell.
✓= structural feature shared; ✗ = structural feature not shared.
Structural feature
circular DNA
DNA combined with structural protein to form
chromosomes
ribosomes about 18 nm in diameter
complex arrangement of internal membranes
peptidoglycan wall
size ranges overlap
Structural feature shared by chloroplast and
typical prokaryotic cell
[6]
[Total: 11]
5 a When isolated chloroplasts are placed in buffer solution with a blue dye such as DCPIP or methylene blue
and illuminated, the blue colour disappears. Explain this observation. [4]
b Name the compound, normally present in photosynthesis, that is replaced by the blue dye in this investigation. [1]
[Total: 5]