The diagram below shows an experiment that was carried out to measure how fast a were plant such as Elodea photosynthesizes

      

The diagram below shows an experiment that was carried out to measure how fast a were plant such as Elodea photosynthesizes

role10471042019.png

The shoot was exposed to different light intensities and the rate of photosynthesis estimated by counting the number of bubbles of gas leaving the shoot in a given time. the results are given below;

minute10491042019.png

a) Plot these data on apiece of graph paper provided

b) At what light intensity did the shoot produce ;
i) 18 bubbles per minute
ii) 25 bubbles per minute

c) Give two better ways of measuring the rate of photosynthesis than counting bubbles

d) What is the role of light intensity in photosynthesis

e) Account for the expected results of doing this experience at the following temperature;
i) 4ºC
ii) 34ºC
iii) 60ºC

f) Other than light intensity and temperature, name other factors that affect the rate of
photosynthesis

  

Answers


Martin
a)bubbles10441042019.png

b)
i) 2.5 – 2.7; i.e. 2.6 + 0.1
ii) 4.5 + 0.1

c)
- Volume of CO2 consumed/ volume of O2 liberated
- Change in dry mass (due to photosynthesis);

d)
- Photolysis of water
ATP synthesis

e)
i) Rate of photosynthesis very low
Enzymes inactivated
ii) Rapid rate of photosynthesis
Optimum temperature for enzyme reaction
iii) Very low rate of photosynthesis
Enzymes denatured

f) Chlorophyll concentration (in leaves)
CO2 concentration
Water availability
marto answered the question on October 4, 2019 at 08:51


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