Cell Biology Homework– Key Area: Photosynthesis
Life on Earth Homework 3
Homework Exercise 13 Photosynthesis
Photosynthesis
1. Answer the following question by selecting the correct letter
The role of chlorophyll in photosynthesis is to trap
(1)
A. light energy for ATP production
B. chemical energy for ATP production
C. light energy for ADP production
D. chemical energy for ADP production
2. Where is chlorophyll found in a plant cell?
(1)
3. There are two stages in photosynthesis. Name both stages:
Stage 1 _____________ Stage 2 _________________
(2)
4. Stage 1 of photosynthesis is represented by the diagram below.
Light energy from the sun
S
oxygen
ADP + T
hydrogen
U
(a) Identify substances S, T and U
(3)
(b) Name the two substances produced by Stage 1 that are required
for Stage 2 of photosynthesis.
(c ) State what happens to excess oxygen produced during photosynthesis
(2).
(1)
5. Photosynthesis is the process by which green plants make glucose
using light energy from the sun.
Light energy
from the sun
By product A
(a) Name the by-product A released during photosynthesis
(1)
(b) Hydrogen and a high energy molecule are produced during
photosynthesis.
(i) Name the high energy molecule.
(1)
(ii) Describe the use of hydrogen in carbon fixation.
(1)
6. The diagram below represents the second stage of photosynthesis.
Two products
from the light
stage enter the
cycle here.
A raw material
enters the cycle
here
Glucose is produced
by this stage of
photosynthesis.
Answer the questions on the following page.
7(a) Name this stage of photosynthesis?
(b) State the two products of the light stage that enter the cycle.
(1)
(1)
(c) Name the gas that enters the cycle as a raw material.
(1)
(d) Explain why an increase in temperature can lead to an increase in
the rate of photosynthesis.
(1)