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.