| A | B |
|---|
| autotrophs | organisms that make their own food |
| heterotrophs | organisms that get energy from foods they eat |
| adenosine triphosphate (ATP) | one of the principal chemical compounds that living things use to store energy |
| photosynthesis | process where plants use the energy of the sun to convert water & carbon dioxide into oxygen & high-energy carbohydrates |
| pigment | light-absorbing molecule |
| chlorophyll | a plant's main pigment |
| thylakoids | saclike photosynthetic membranes arranged in stacks |
| stroma | region outside the thylakoid membranes in chloroplasts |
| light-dependent reactions | use energy from light to produce ATP |
| Calvin cycle | plants use the enrgy that ATP contains to build high-energy compounds that can be stored for a long time |
