5A Limiting factors in Photosynthesis

Question 1

How does light intensity affect photosynthesis

Answer 1

There needs to be a high light intensity of a certain wavelength

Light energy is needed for the light dependent reaction

Question 2

How does temperature affect photosynthesis

Answer 2

Temperature needs to be abound 25 degrees C as photosynthesis involves enzymes and if the temp falls below 10 degrees the enzyme become inactive and if it rises above 45 degrees the enzymes denature and stomata close and photosynthesis slows down less less CO2 enters the leaf

Question 3

How does carbon dioxide concentration affect photosynthesis

Answer 3

the CO2 concentration needs to be around 0.4% any higher and stomata start to close

Question 4

How does water affect photosynthesis

Answer 4

plants need a constant supply of water - too little and photosynthesis stops - too much and the soil becomes waterlogged and the the uptake of the minerals needed to make photosynthetic pigments is reduced

Question 5

How to control co2 concentration in a greenhouse

Answer 5

add it to the air by a CO2 generator

Question 6

How to control temperature in a greenhouse

Answer 6

Heaters and cooling systems, glasshouses trap heat

Question 7

How to control light intensity in a greenhouse

Answer 7

Add a lamp at night