Gas Exchange in Leaf Flashcards
What are xerophytic plants
Plants with adaptations to limit their water loss, live in conditions with plentiful supply of freshwater
What factros make them vulnerable to water loss
Large surface area provided by air spaces in spongy mesophyll
Leaves with short diffusion distances
What adaptations do xerophytic plants have
Very few stomta
Sunken stomata
Hairs surrounding stomata
Needle shapes or small leaves
Waxy cuticle
What adaptations do xerophytic plants have
Very few stomta
Sunken stomata
Hairs surrounding stomata
Needle shapes or small leaves
Waxy cuticle
Example of xero[hytic plants
Cacti
Cacti adaptations
Leaves have become spines that can no longer photosynthesise
Photosynthesis occurs in the green stem in chloroplasts
Stem has thick cuticle which is large in diameter to store water
Shallow and deep roots to access all water available
What is marram grass
Commonly found in sand dunes
How are marram grasses leaves adapted
Roll up = reduce exposure of surfaces to wind
Roll up = provides grooves whihc protect stomata
Exposed surface = no stomata and thick cuticle
Inner surface = large number of hairs
Where does gas exchange occur
Through stomata on lower epidermis
Name the type of plant
Dicotyledonous plants
How are stomas opened
Open using ions (K+) which move in by active transprot
Allowing water loss to stay balanced
What is a stoma
Openings which allow for exchange of CO2 and O2
How do stomatas open
Guard cells bend due ot becoming turgid as water moves in by osmosis due to the water potential decreasing
Why is gas exchange in plants importnt
Helps them carry out photosynthesis to make food and ATP
How does gas exchange take place
CO2 enters through stomata and O2 is released
