Biology: Flowering plants (nutrition)

what type of reaction is photosythesis?

endothermic

from where to where is energy transferred in photosynthesis?

energy from sunlight to chloroplasts

how do plants take in energy from photosynthesis?

chlorophyll absorbs the energy from sunlight

what do green plants use the energy from photosynthesis for?

making the carbohydrate glucose from the raw materials water and carbon dioxide

what is he waste product of photosynthesis?

oxygen

define photosynthesis:

the process by which plants manufacture carbohydrates from raw materials using energy from light

what makes plants autotrophs?

they can make complex molecules (glucose) from simple molecules (carbon dioxide and water)

what makes plants producers

they can make their own food and so are the first organism at the start of all food chains

what do plants use the glucose they make for?

a source of energy in respiration. produce starch for storage. synthesise lipids for an energy source in seeds. to form cellulose to make cell walls. produce amino acids when combined with mineral ions absorbed by the roots.

the word equation for photosynthesis:

carbon dioxide + water -chlorophyll and light→ glucose + oxygen

where does the plant get carbon dioxide for photsynthesis from?

the carbon dioxide diffuses into the leaf via the stomata

where does the plant get water for photsynthesis from?

the water is taken up via the roots and transported through the xylem to the leaves

how does the oxygen formed from photosynthesis leave the plant?

the oxygen diffuses out of the leaf via the stomata

the chemical equation for photosynthesis:

6CO2 + 6H2O -chlorophyll and light→ C6H12O6 + 6O2

define a limiting factor:

something present in the environment in such a short supply that it restricts life processes

list the 3 main factors that limit the rate of photosynthesis:

temperature, light intensity, carbon dioxide concentration

why is water not a limiting factor in photosynthesis?

the amount of water eneded is relatively small compared to the amount of water transpired from a plant.

why might temperature be a limiting factor in photosynthesis?

The temperature of the environment affects the speed at which carbon dioxide and water move through a plant due to how much kinetic energy the particles have.

what happens when temperature is lowered for photosynthesis?

the lower the temperature, the less kinetic energy the particles have, resulting in less succesful collisions occuring over a period of time.

what happens when temperature is increased for photosynthesis?

Increasing temperature increases the kinetic energy of particles, increasing the likelihood of collisions between reactants and enzymes which results in the formation of products