Transport, Gas exchange and storage in flowering plants Flashcards
What are autotrophic plants
They make their own food by a process called photosynthesis
How do roots absorb water
Water passes from the root hairs epidermis across the ground tissue to the xylem
- root hairs absorb water by osmosis
- water passes through the great tissue by osmosis
What is root pressure
Root pressure is the forced upward movement of water (and mineral salts) from the roots up Through the stem
What is transpiration
It is the loss of water vapour from the plant through the pores in the leaf called stomata
How do Roots absorb minerals
1) Active transport
2) diffusion
Why is calcium Needed in plants
It is needed to make the middle lamella between plant cell walls
Why is magnesium needed in plants
It is required to form chlorophyll
Why is nitrates needed in plants
It is a source of nitrogen and is required to make amino acids
What is active transport
It is the movement of a substance from a region of its low concentration (in the soil) to its high concentration (in the root) it’s requires energy
How are minerals transported
In the xylem
Who came up with the cohesion and tension model
Dixon and jolly, Trinity College, Dublin, 1895
What is the function of stomata
- Carbon dioxide (C02) moves in by diffusion and his need for photosynthesis
- Oxygen (02) moves out by diffusion is a waste product produced by photosynthesis.
- Water vapour (H20) Moves out by diffusion – (called transpiration)
What absorbs light for photosynthesis
Chloroplasts
What are lenticels
There are openings in the stems for gas exchange
What causes stomata to open
In the morning – there is more light – photosynthesis increases – carbonara side is needed – stomach open to that CO2 in
