adaptations to the availability of water Flashcards
what are the adaptations of a terrestrial plant
waxy cuticle- reduce evaporation
stomata underneath leaf- out of direct sun reducing evaporation
stomata closed at night
Where are stomata located on terrestrial plants
underneath the lead, placing stomata out of direct sunlight, reducing evaporation
what type of plant is Maram grass
Xerophyte- lives in arid/ dry conditions
Why do Marram grass have rolled leaves
Tightly Rolled leaves trap air inside and makes it humid, reducing water loss
Marram grass has a waxy cuticle, how does it reduce water loss
reduces evaporation through the epidermis of the leaf
where are the stomata located on the leaf of a Marram Grass and why
The stomata are located on the inside of the rolled leaf, reduces exposure to wind and reduces water loss
How does pitted stomata help reduce water loss
Pits trap moist air, reducing the water potential gradient between the inside of leaf and outside
The lower water potential slows the water loss rate
Cacti are succulents, What is a succulent
store water in their stems to become swollen
what are cacti stems usually ribbed
To expand when water is available
Cacti live in arid conditions, what are their 4 adaptations
-Store water in stem
-Leaves are reduced to spines to reduce surface area and reduce transpiration
-Stem is green for photosynthesis
-Roots are widespread to take advantage of rain that does fall.
Some xerophytic plants reduce transpiration by maintaining a low water potential in the leaf
Xerophytic plants maintain a high salt concentration to make water potential low and reduce transpiration.
Hydrophytes have large air spaces, why
large air spaces in the plant- allow buoyancy and keep leaf afloat, so they are in the air and can absorb sunlight.
why do hydrophytes have their stomata on the upper side of the leaf.
stomata are then exposed to air and allow gaseous exchange
