Transport in plants Flashcards
Dicotyledon
Plants with veins (like oak leaves)
Structure of cross section of dicotyledonous root
Root hair cell projections, epidermis, cortex, endodermis, casparian strip, endodermis, pericycle, phloem, xylem.
what runs through the endodermis?
Casparian strip
what is special about the casparian strip? what is it made of?
Its water proof! It’s made of SUBERIN
Apoplast
movement of water through the cell walls and gaps between cell walls.
symplast
movement of water through the cytoplasm and plasmadesmata
why is more water transported through the apoplast route?
water faces more resistance through the cytoplasm.
Water flows in one continuous stream through the cell wall due to cohesion.
explain how water travels in the cell wall..
cohesion, adhesion - capilliary action.
What happens at the casparian strip?
Why does this happen? how does this help?
Water travelling via apoplast passes into the cytoplasm and follows the symplast pathway. The casparian strip is waterproof. The cytoplasm can now control which substances enter.
Why does water move from root hair cell to the xylem?
Difference in water potential between root hair cell and xylem.
What is root pressure?
Active transport transports mineral ions into xylem to reduce the water potential.
two main cells that make up the PHLOEM?
Sieve tube element, companion cell.
after photosynthesis, what is glucose transformed into?
Sucrose
What do you call the leaves and storage organs and why?
Sources - because they’re the sources of sucrose
What do we call roots, storage organs, shoots and why
Sinks- because this is where sucrose is deposited (to be utilised).