6.2 Exchange and transport

Question	Answer
How does carbon dioxide enter and leave flowering plants?	By diffusion through the stomata
How are most of the water and mineral ions absorbed in flowering plants?	They are absorbed by the roots
How is the surface area of the roots increased?	Root hairs
How is the surface area of the leaves increased?	Flattened shape and internal air spaces
Why do plants have a stomata?	To obtain carbon dioxide from the atmosphere To remove oxygen produced in photosynthesis
Where do plants mainly lose water vapour?	From the stomata in their leaves
In what conditions is evaporation more rapid?	Hot, dry and windy conditions
What happens if plants lose water faster than it is replaced by the roots?	The stomata can close to prevent wilting
Which cells control the size of the stomata and where are they placed?	Guard cells Surround the stomata
Which three transport systems does a plant have?	Xylem Transpiration Stream Phloem
What do xylem tissues transport?	Water and mineral ions from the roots to the stem and leaves
What is the transpiration stream?	The movement of water from the roots through the xylem and out of the leaves
What do phloem tissues transport? What is the process called?	Dissolved sugars from the leaves to the rest of the plant, including growing regions and the storage organs Translocation

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	Created by Anisha Rai over 8 years ago