BIOL 119 Chapter Notes - Chapter 39: Hydrogen Bond, Symporter, Electrochemical Gradient
Document Summary
Essential nutients- an element or compound required for normal growth and reproduction plant cannot complete its life cycle without this nutrient. Vascular plants- 17 elements are essential; carbon, hydrogen, and oxygen typically make up about 96% of dry weight of plant: remaining 14- mineral nutrients, originate in soil. Macronutrients- elements in the soil that are required by plants in relatively large quantities. Limiting nutrients- availability limits plants growth: n, p, k- if added to soil as fertilizer plant growth increases. Micronutrients- required in small quantities; usually cofactors for specific enzymes. Key nutrients in short supply?- mobile elements in short supply are transported from older leaves to younger leaves so older leaves deteriorate first: immobile elements: younger leaves deteriorate first. Hydroponiac growth- takes place in liquid cultures, without soil, so researchers can precisely control the availability of each nutrient: helps to diagnose nutrient deficiencies. 39. 2-soil: a dynamic mixture of living and nonliving components.
