Plants and Nutrient Uptake Questions & Answers

Plants and Nutrient Uptake Questions & Answers Plants' need for mineral nutrients - ANS-Required for growth and reproduction Composition of plant's dry mass - ANS-Carbon, hydrogen, and oxygen (96%) Macronutrient - ANS-Plants need in large amounts (e.g., Nitrogen, Phosphorous, Potassium) Micronutrient - ANS-Plants need in small quantities (e.g., cofactors for specific enzymes) Limiting nutrient - ANS-Availability limits plant growth (e.g., Nitrogen, Phosphorous, Potassium) Mobile nutrient - ANS-Moves from old leaves to young parts of the plant (e.g., Nitrogen, Phosphorous, Potassium, Magnesium) Immobile nutrient - ANS-Bound to old leaves, symptomatic in young leaves (e.g., Iron, Calcium) Nutrient uptake location - ANS-Plant roots Nutrient uptake process - ANS-Proton pumps establish concentration gradient, cations move along charge gradient, anions move with protons Passive exclusion - ANS-Ions are excluded if no transport is present Nitrogen fixation - ANS-Conversion of N2 to ammonium or nitrate by bacteria and archaea Role of leghemoglobin - ANS-Binds O2, keeps O2 concentrations low inside nodules