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| Pregunta | Respuesta |
| Define negative feedback | A process in which a parameter brings about the reversal of change so the parameter is kept fairly constant |
| Define postive feedback | A process in which any change in a parameter brings about an increase in that change |
| Define Homeostasis | The maintenance of a constant internal environment despite external changes |
| What is an autotroph? | An organism that makes its own food using simple inorganic molecules (such as CO2, H2O etc) and energy |
| What is a heterotroph? | An organism that gains its nutrients from complex organic molecules. / It digests them to simpler soluble molecules before respiring some of them to obtain energy or using products of digestion to synthesise the organic molecules it needs. |
| What is are photosynthetic pigments? | Chemicals that absorb light energy, found in the thylakoid membranes of chloroplasts, in photosystems. /Each pigment absorbs energy associated with light of a specific wavelength |
| What is a respiratory substrate? | An organic substance that can be used for respiration |
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