5a, 5b & 5c – To Investigate Factors that Affect the Rate of Photosynthesis (LC 2027) (Leaving Cert Biology): Quizzes
📚Quizzes
Practise the questions
13 questions from this quiz
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Practise the questions
13 questions from this quiz
What are the three main limiting factors that affect the rate of photosynthesis?
What are the three main limiting factors that affect the rate of photosynthesis?
Light intensity, temperature, CO₂ concentration
Why is counting oxygen bubbles a suitable method for measuring photosynthesis rate?
Why is counting oxygen bubbles a suitable method for measuring photosynthesis rate?
Each bubble represents O₂ from reaction
Why is sodium bicarbonate solution added to the water in these investigations?
Why is sodium bicarbonate solution added to the water in these investigations?
To provide constant CO₂ supply
What temperature is maintained in the water bath for the light intensity investigation?
What temperature is maintained in the water bath for the light intensity investigation?
25°C
What is the relationship between light intensity and distance from the light source?
What is the relationship between light intensity and distance from the light source?
Light intensity
When the distance from the light source doubles, what happens to light intensity?
When the distance from the light source doubles, what happens to light intensity?
It becomes four times weaker
What distance is the lamp kept at during the temperature investigation?
What distance is the lamp kept at during the temperature investigation?
Fixed at 20cm
How long must the apparatus equilibrate before counting bubbles in the temperature investigation?
How long must the apparatus equilibrate before counting bubbles in the temperature investigation?
5 minutes
What shape does the graph show when plotting photosynthesis rate against temperature?
What shape does the graph show when plotting photosynthesis rate against temperature?
Bell-shaped curve
Why does photosynthesis rate decrease rapidly at high temperatures?
Why does photosynthesis rate decrease rapidly at high temperatures?
Enzymes become denatured
What happens to photosynthesis rate at low CO₂ concentrations?
What happens to photosynthesis rate at low CO₂ concentrations?
Limited production as CO₂ is limiting
How many times should each measurement be repeated to improve accuracy?
How many times should each measurement be repeated to improve accuracy?
Three times
What is a common source of error in these photosynthesis investigations?
What is a common source of error in these photosynthesis investigations?
Inconsistent bubble counting