Flashcards in Unit 4.2 Plant tissues, organs and organ systems Deck (41)
Epidermal tissue function is
covers the plant
Palisade mesophyll tissue function is
trap sunlight for photosynthesis - packed full with chloroplasts
Spongy mesophyll tissue function is
contains lots of air spaces to allow gases to diffuse in and out of cells
to transport water from the roots up and down the plant
to transport glucose from the leaves up and down the plant
Is the mass movement of sugars up and down the plant
Meristem tissue function
found at the growing tips (shoots and roots) and can differentiate into lots of different types of plant cells
Upper epidermis tissue function is
transparent so that light can pass through
Stomata function is
composed of 2 guard cells - this allows the gases to diffuse into and out of the leaf
The phloem tubes are made up of
elongated living cells
Xylem tubes/vessels are made up of
Define the transpiration stream
movement of water from the roots, through the xylem and out of the stomata
the evaporation of water from the leaves of a plant via its stomata
Transpiration is fastest when it is
windy, dry air, sunny and warm
Transpiration is slow when it is
cold, dark, humid and not windy
How can you estimate the rate of transpiration?
By measuring the rate of water uptake using a potometer
Name the cell that makes up the stomata
How do guard cells respond when there is plenty of water available?
they become turgid and the stomata open
How do guard cells respond when there is not a lot of water available?
they shrink and become flaccid and the stomata close
How do they stomata respond to the dark
they close to conserve water
Which side of a leaf do you find more stomata
Why is there fewer stomata on the upper surface of a leaf?
because it is sunnier and warmer - having less stomata reduced water loss
why is the upper epidermis transparent?
to allow light to pass through
What type of cells is the xylem made from ?
Xylem tubes are strengthened by what material?
The movement of water from the roots up the stem and out through the leaves is called the...
This word describes the evaporation and diffusion of water from the leaf via the stomata
Phloem tubes are made up from what type of cell?
In a plant is glucose transported down the plant OR up and down the plant?
up AND down