2g - Gas Exchange Flashcards
What does the net exchange of gases depend on?
Light Intensity
During the day, do plants make more or less oxygen than they use in respiration?
More
During the day, do plants use up more or less CO2 than they produce?
More
At night do plants take in o2 or release it?
Take it in for respiration
Why is leaves being broad an advantage?
So they have a large surface area for diffusion
Why is leaves being thin an advantage?
So there is short diffusion pathway for the gases
During the day are the stomata open or close?
Open to allow CO2 in for photosynthesis
During the day, do the stomata let water in or out?
Out
At night are the stomata open or closed?
Closed to stop water loss (don’t need to let co2 in)
What happens to guard cells as they open the stomata?
They increase in volume
What happens to guard cells as they close the stomata?
They decrease in volume
What colour is hydrogen carbonate indicator in high co2 levels?
Yellow
What colour is hydrogen carbonate indicator in low co2 levels?
Purple
What colour is hydrogen carbonate indicator in normal CO2 levels?
Red
What’s the function of the ribs?
protects internal organs such as the lungs