Unit 1 Food-Matter & Energy

Front

what is photosynthesis?

Back

plants convert light energy to chemical energy in food

plants take in CO2, H2O and sunlight

animals eat the glucose for food energy, & breathe in the oxygen

Front

what is cellular respiration?

Back

energy is released from food

food molecules are broken down by our digestive system

we breathe O2

food & O2 are carried to the cells though our bloodstream

energy is released from the food

all plants and animals need to release energy from food

Front

where does our food come from?

Back

glucose made during photosynthesis

all the energy in our food originates with the sun

Front

what does a human or animal's body do with food once it is eaten?

Back

food molecules are broken down by our digestive system

carbs are broken into glucose

proteins into amino acids

food subunits are carried to all the cells of our body by the bloodstream

Front

what does our body use food molecules for?

Back

glucose is used for energy

protein is used for growth & repair

food not used right away is converted to fats for long term storage

Front

why do we need to eat food but plants don't?

Back

plants make their own food molecules during photosynthesis

animals can't make food molecules, so we have to eat

Front

what processes do plants perform when it is light? dark?

Back

photosynthesis when it is light

plants perform cellular respiration at all times because cells need energy to function

Front

how do carbon atoms move among organisms in an ecosystem?

Back

plants take in CO2; the carbon is rearranged into glucose during photosynthesis

animals eat the glucose

animals breathe out CO2, which can go back to the plant

Front

how does energy move among organisms?

Back

plants take in light energy

light energy is converted to chemical energy in food during photosynthesis

animals eat food

during cellular respiration, the chemical energy in food is transformed to thermal & kinetic energy

Front

why can carbon move back and forth between organisms, but energy only flows in one direction?

Back

plants need light energy, but animals don't produce light

carbon atoms can be constantly transformed between CO2 & glucose