BIOL 102 Lecture Notes - Lecture 24: Ion Exchange, Ice Crystals, Xerophyte
Document Summary
Provides: mineral nutrients, water, and oxygen for roots. B (subsoil) contains leached minerals; some plant roots can reach b. Essential for mineral availability to plant roots. Inorganic fertilizer: provides nutrients in readily available form. Plant affect local soil ph by either secreting h+, oh- or hco3- ions. 3 requirements: strong reducing agent, energy, nitrogen"s. Inhibited by oxygen, nitrogen fixing bacteria are anaerobic. Evolved to gain nutrient(n) from animal tissues. They grow faster and perform more photosynthesis when they eat insects. Parasitize other plants but inserting haustoria organs and absorbs nutrients. Higher water use efficiency than others: dessert. Deep taproot or fast growing roots that are active during brief wet season. Most plants cannot live long in flooded/saturated soils. Adaptations: slow root growth, shallow soil, anaerobic metabolism, slow growth. Pneumatophores: extensions of roots that grow out of the water for air. It increases unsaturated fatty acid in membranes that can preserve fluidity. Have antifreeze proteins to prevent ice crystals from forming.
