xerophytes and hydrophytes

Question 1

what are hydrophytes

Answer 1

live either partially or completely submerged in water

Question 2

what are mesophytes

Answer 2

able to take up sufficient water to replace transpiration

Question 3

what are xerophytes

Answer 3

plants that are adapted for them to survive hot, dry conditions

Question 4

whta adaptations do plants have to prevent water loss

Answer 4

-waxy cuticle
-stomata on underside of leaf
-stomata closed at night
-decidous plants lose their leaves in winter

Question 6

how does a waxy cuticle prevent water loss

Answer 6

due to evaporation through the epidermis as the waxy layer that covers the epidermis is thick

Question 7

how does stomata on underside of leaf reduce water loss

Answer 7

reduces evaporation due to direct heating from the sun

Question 8

how does stomata closed at night prevent water loss

Answer 8

no light for photosynthesis

Question 9

how does leaf loss in winter prevent water loss

Answer 9

when the ground may be frozen (less water available) and temp may be too low for photosynthesis

Question 10

why do plants have hairs and spikes

Answer 10

-traps a layer of still air between the hairs which increases the thickness of the uppermost layer
-this reduces the water vapour potential gradient

Question 11

how does a sunken stomata effect the leaf

Answer 11

stomata sunken in pits create local humidity and decreases exposure to air currents and decreases water loss