5a, 5b & 5c – To Investigate Factors that Affect the Rate of Photosynthesis (LC 2027) (Leaving Cert Biology): Flashcards
📚Flashcards
Practise the cards
15 cards from this deck
ShowHide
Practise the cards
15 cards from this deck
3 main limiting factors for photosynthesis rate
3 main limiting factors for photosynthesis rate
Light intensity, temperature, CO₂ concentration
Method to measure photosynthesis rate in water
Method to measure photosynthesis rate in water
Count oxygen bubbles produced
What oxygen bubbles in photosynthesis experiments show
What oxygen bubbles in photosynthesis experiments show
Oxygen gas produced during light-dependent reactions
Purpose of sodium hydrogen carbonate in photosynthesis exp
Purpose of sodium hydrogen carbonate in photosynthesis exp
Provides constant supply of carbon dioxide
Light intensity relationship with distance
Light intensity relationship with distance
Follows inverse square law
Effect of doubling distance from light source
Effect of doubling distance from light source
Light intensity becomes 4 times weaker
Water bath temperature for Investigation 5a
Water bath temperature for Investigation 5a
25°C
Why temperature affects photosynthesis rate
Why temperature affects photosynthesis rate
Photosynthesis involves enzyme-controlled reactions
Shape of temperature vs photosynthesis rate graph
Shape of temperature vs photosynthesis rate graph
Bell-shaped curve
What happens to enzymes at high temperatures
What happens to enzymes at high temperatures
They denature and lose function
Optimal temperature range for photosynthesis
Optimal temperature range for photosynthesis
25-35°C
Effect of low CO₂ concentration on photosynthesis
Effect of low CO₂ concentration on photosynthesis
CO₂ becomes limiting factor, limited bubble production
Number of times to repeat each measurement
Number of times to repeat each measurement
Three times, then calculate average
Alternative to bubble counting for measuring O₂
Alternative to bubble counting for measuring O₂
Collect gas in inverted tube, measure volume
Lamp distance kept constant in Investigation 5b
Lamp distance kept constant in Investigation 5b
20 cm