Topic 6- Plant Structure and their Functions Flashcards
Waxy cuticle…
Prevents water loss through transpiration
Less stomata for decreased water loss
Upper epidermis…
Transparent and thin for more light to pass through to the palisade layer
Palisade mesophyll tissue…
Contains lots of chloroplasts to absorb the light energy which has passed through
Spongy mesophyll tissue…
Contains air spaces to increase rate of diffusion
Lower epidimis…
Contains lots of stomata (see other revision card)
Stomata are found…
On the lower surface of a leaf
Stomata allow gaseous exchange which means…
Carbon dioxide (CO2) in for photosynthesis Oxygen (02) out as a product of this reaction
Water vapour escapes through the stomata during…
Transpiration
When the guard cells are full of water…
The guard cells are turgid (swollen) and therefore the stomata opens
When the guard cell are not full of water and limp…
The guard cells are flaccid and the stomata close
Photosynthesis word equation
Chlorophyll
Carbon dioxide + Water > Glucose + Oxygen
Light
Balanced photosynthesis equation
6CO2 + 6H2O > C6H12O6 + 6O2
Photosynthesis occurs inside the…
Chloroplasts which contains chlorophyll which absorbs light
Photosynthesis is an …. reaction
Endothermic reaction which means energy is TAKEN IN during the reaction
Phloem tubes transport…
Food substances, mainly sucrose
Phloem tube cells are…
Living cells
Which are seen as green through a microscope
Phloem tube adaptations
Have small pores in the end walls to allow sucrose and food substances to flow through quicker
Phloem tubes transport in…
Both directions, up and down
Xylem tubes transport…
Water and mineral ions from root hair cells
Xylem tubes are…
Dead cells
Seen as brown down a microscope
Xylem tube adaptations
Hollow tubes with no end cell walls therefore water flow isn’t slowed down
Xylem tubes transport water and mineral ions…
Upwards from the root hair cells carried to the leaves via the roots and stem
Root hair cells are found…
On the surface of the roots
Root hair cell adaptations
Large surface area for absorbing water and mineral ions
Which are transported upwards from the root hair cells
Root hair cells absorb minerals…
By active transport, because there is a higher concentration of mineral ions in the root hair cells compared to the soil around
Root hair cells absorb water…
By osmosis, water molecules moving across a partially permeable membrane, from higher water concentration to lower water concentration
