Presentation on theme: "B4 a-d Pig (H). What is the job of air spaces?"— Presentation transcript:
B4 a-d Pig (H)
What is the job of air spaces?
Allow gases to diffuse from palisade cell to air/air to palisade cell
List 3 adaptations of a leaf for efficient photosynthesis
Broad (large surface area) This (short diffusion distance) Palisade cells have many chloroplasts (containing chlorophyll) Veins bring water/remove sugar Stomata allow carbon dioxide in/oxygen out Transparent epidermis Palisade cells near top of leaf Air spaces Large surface area to volume ratio
What is osmosis
Diffusion of water from a high water concentration to a low water concentration across a partially permeable membrane
What will happen to a red blood cell if you inject pure water into your veins?
Water will enter the cell by osmosis until it bursts
Explain the importance of osmosis in plant support
Water enters cells by osmosis Increased volume of water inside vacuole pushes out against cell wall Cells are turgid (stiff) Turgid cells support plant
What is the job of tube Z?
Transporting sugars around the plant
What is this device called and what is it for?
Potometer Measuring water uptake (allow transpiration) in a plant
Why does increasing the wind speed increase the rate of transpiration?
Water vapour is removed from outside the stomata Increased the concentration gradient between air space and air Faster diffusion
List 2 ways desert plants are adapted to reduce water loss
Extra thick waxy cuticle Few stomata/stomata often closed Stomata in pits/surrounded by hairs Small leaves (reduced surface areas)
HOW do stomata close at night?
Photosynthesis stops Glucose used up by respiration Water concentration in guard cell increases Water leaves guard cell by osmosis Guard cell becomes flaccid and changes shape Stomata closes
Why does a plant need magnesium?
To make chlorophyll (for photosynthesis)
What will a plant look like if it is grown with very little nitrate?
How do minerals enter a root hair?
How is active transport different from diffusion?
Moves substances from low to high concentration Requires energy