chapter 4 Ph photosynthesis
chapter 4 Photosynthesis
Introduction Co2+H2O光绿色物(cH2O)+O2(1)
Introduction ❑ Strategies for getting energy ➢ Photoautotrophic & Chemoautotrophic: • Make it (e.g. photosynthesis) ➢ Heterotrophic. • Eat it CO２+ H２O 光 绿色植物 (CH２O)＋O２ (1)
Introduction
Introduction ❑ Sunlight = energy & information for plants. ➢ Radiant energy (SUNLIGHT) • Maintains planetary temperature suitable for life • Ultimate source of energy to sustain life (Photosynthesis). ➢ Provides information about the environment • Photomorphogenisis (光形态发生作用） – light quality. • Photoperiodism-- day/night length
ignificance of photos
Significance of photosynthesis ➢ Photosynthesis – Essential for animal survival. • Captures energy from the sun. • Makes complex organic molecules from CO2, water and minerals. • Releases O2 required for cellular respiration. ➢ ~ 250 Billion metric tons of sugar produced each year via photosynthesis
Photosynthesis
Photosynthesis light 6 CO2 + 6 H2O C6H12O6 + 6 O2 Consists of both Light & Carbon-fixation Reactions