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Biology As/A Level- Gas exchange in leaf of plant Flashcards | StudBud

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Biology As/A Level- Gas exchange in leaf of plant

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A #biology #quiz for the gas exchange in #leaf of #plant

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Questions 10

Answers

1
How are cells in the mesophyll layer adapted for rapid diffusion?
Large surface area
small- lots fit in a small space
They're green to get rid of predators
good blood supply
2
What is in the mesophyll layer, and what is it's purpose?
Small hairs which trap a layer of air to keep plant warm
interconnecting air spaces, so gases can diffuse in/out
stomata so gases can diffuse through short diffusion pathway
Air sacs,so mesophyll cells have lots of gases for processes
3
True or False- All plant cells with chloroplasts photosynthesise 24/7
True
False
4
True or False- Plant cells respire all the time
True
False
5
What type of cells surround the stomata?
Guard cells
Red blood cells
Mesophyll cells
root cells
6
How have the stomata adapted to reduce water loss?
They make the plant invisible when a predator comes
They shrink and grow depending on weather conditions
They open when the leaf gets too hot
They close at times when water loss would be excessive
7
True or False- There is no specific transport system, gases just diffuse in and out.
False
True
8
2 reasons why gas exchange in a leaf is quick
Cells close to surface, constant diffusion gradient
short diffusion pathway & diffusion takes place in water
short diffusion pathway, xylem vessels
short diffusion pathway & diffusion takes place in gas
9
What are the products of photosynthesis?
Glucose & Oxygen
Oxygen & Water
Glucose & CO2
CO2 & Oxygen
10
Most oxygen from photosynthesis diffuses out the plant, but where does the remaining oxygen go?
used to make the plant lighter so it can blow in the wind
It's used for respiration
It stays in the spongy mesophyll layer
It diffuses out via the roots