Manipulating Rates Of Photosynthesis Flashcards
How are leaves adapted to maximise photosynthesis by being wide and flat? (Two points)
- wide= because it provides a large surface area
- flat= because it provides a short diffusion path for carbon dioxide
How do the mesophyll cells in a leaf maximise photosynthesis?
Mesophyll cells have lots of chloroplasts to absorb maximum light
How do the fact that leaves have lots of xylem and phloem help in maximising photosynthesis?
- xylem= to bring water to leaf
- phloem= to transport glucose produced in photosynthesis to rest of the plant
What are FOUR ways that conditions can be changed to maximise the rate of photosynthesise and increase growth rate?
- use artificial light
- use gas or electric heaters
- increase carbon dioxide concentration
- ensure mineral content are kept high enough (nitrates/magnesium etc)
How can using artificial lights to manipulate the rate of photosynthesise be a disadvantage?
- they run on electrical which will be expensive
How can using artificial lights to manipulate the rate of photosynthesise be an advantage? (2 points)
- can be used to increase the rate of photosynthesise during winter
- enables photosynthesise to happen at night
How can using gas heaters to manipulate photosynthesise be a disadvantage?
- gas is a fossil fuel and excess carbon dioxide will be released into the air
How can using gas heaters in manipulating the rate of photosynthesise be an advantage? (3 points)
- increases the temperature
- releases carbon dioxide directly into green house preventing it from becoming a limiting factor
- increases the rate of photosynthesise further
How can using electric heaters to manipulate photosynthesise be an advantage?
- warm up greenhouses and speeds up the rate of photosynthesise
How can using electric heaters to manipulate the rate of photosynthesis be a disadvantage?
- electricity is normally produced using fossil fuels which releases carbon dioxide as a waste product which contributes to climate change
