6. Plant structures and functions. Flashcards
what are the main producers of food and therefore biomass?
photosynthetic organisms
in what sort of organisms does photosynthesis occur?
plants and algae
what are the reactants in photosynthesis?
carbon dioxide and water
what are the products in photosynthesis?
glucose and oxygen
what does photosynthesis require?
light energy
give the word equation for photosynthesis
carbon dioxide + water—> glucose+ Oxygen
give three limiting factors on the rate of photosynthesis
temperature, light, intensity, and carbon dioxide concentration
what is the rate of photosynthesis directly proportional to?
light intensity
what is the rate of photosynthesis inversely the proportional to?
The distance from LightSource
what is the independent variable when investigating the effect of light intensity on the rate of photosynthesis?
distance on the lamp to the pond weed
what is a dependent variable, when investigating the effect of light intensity on the rate of photosynthesis
rate of change of pH of the solution
what is the function of root hair cells?
to absorb water and mineral ions from the soil
how are root hair cells adapted to their function?
they have large surface area
what is the function of the xylem?
transporting water and minerals through the plan
how are xylem adapted to their function?
they have lignified dead cells. The dead cells have no cytoplasm, so there is no space for water to move through. the wall strengthened with lignin rings, which makes them strong and stop them collapsing.
what is the function of a phloem?
transport sucrose around a plant
how are phloem adapted to their function?
they have living cells which is energy to transport substances. They contain sieve tube elements and companion cells
name the process which water and mineral irons are transported through the plant
transpiration
name the process which sucrose is transported around the plant
translocation
give three factors that affect the rate of transpiration
light intensity, air movement and temperature
how does light intensity, affect transpiration
high light intensity causes, stomata open, rate of evaporation increases, so more water is taken up to replace it
how does air movement affect transpiration
more movement means transpiration increases
how does temperature affect transpiration?
higher temperatures leads to a faster rate of transpiration
what equipment do you need to measure the rate of transpiration?
potometer
