BIOL 1202 Lecture : Biology Notes 36.5-38
Document Summary
Concept 36. 5: sugars are transported from sources to sinks via the phloem: translocation: the transport of organic nutrients in the phloem of a plant. Loading sucrose into phloem: proton pumping and contransport of sucrose allows companion cells to accumulate sugar at high concentrations. Pressure flow: the translocation mechanism: high pressure at source, low pressure at sink, pressure gradient drives flow of phloem sap from source to sink, figure 36. 18. Concept 37. 1: soil contains a living complex ecosystem: in addition to climate, texture and composition of soil are major factors determining the distribution of plants. Texture and composition of soil: soil made up of particles derived from breakdown of rocks (minerals) with organic material (humus, texture: relative amounts of various sizes of soils particles, composition: relative amounts of inorganic and organic components. Availability of water: after rains, smaller spaces in the soil retain water because of.
