2 The leaves absorb carbon dioxide from the air and trap sunlight. Plants use sunlight to transform carbon dioxide and raw sap into elaborated sap. The elaborated sap travels from the leaves to other parts of the plant. 4 ●●○ EXPLAIN the difference between raw sap and elaborated sap to your partner. INVESTIGATE In which direction does raw sap circulate? And elaborated sap? When does photosynthesis take place? During the day or at night? Why? B e a Sc i e nt i s t ! Respiration in plants Like animals, plants continually take in oxygen from the air and expel carbon dioxide. Plants produce much more oxygen than they use. Elaborated sap is… Raw sap is… 4 3 t w e n t y - n i n e · 29
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