QUESTION2 temporarily in the vacuole. Plant roots take up phosphorus from the so

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QUESTION2 temporarily in the vacuole. Plant roots take up phosphorus from the soll in the form of inorganic Why can't inorganic phosphate pass directly through the cell membrane or the vacuole membrane? phosphate, H2PO4, then store it Words:0 Path p QUESTION 3 The concentration of inorganic phosphate is lowest in the soil, highest in the cytoplasm soil, highest in the cytoplasm, and intermediate in the vacuole Does movement of inorganic phosphate from the soil into the cytoplasm require energy? What about movement vacuole? Why or why not? from the cytoplasm into the Arial Path:p words QUESTION 4 Inoraanio phosphate moves across the cell membrane and the vacuole membrane with the helo of a orotein That orotein. whenit Click Save and Submit to save and submit. Click Save All Ansuwers to sqve all anscers Save Ail Ans

Explanation / Answer

Phosphorous is a second most important mineral required by plants after nitrogen. Uptake of P is not easy because the concentration of this in the soil is low but requirements of plants are high. The plants accessed P in the form of Pi, the concentration of it 10 m rarely in soil solutions. therefore, plants have special transporters at the boundary of root & soil for Pi extraction from micromolar solutions concentrations, form of Pi present in solution changes according to pH. pH below 6.0, monovalent H2PO4 form of Pi will present, also H3PO4 and HPO4 2 will be present in less proportions. Pi uptake depends on pH, in higher plants,t uptake rates are maximum between pH 5.0 and 6.0, where H2PO4 dominates, that suggests that intake of Pi is in the monovalent form.

Cytoplasmic concentration of Pi is maintained at constant 5–10 mm, independent of external concentrations of Pi, except severe depletion of P. In opposite, Pi concentrations of vacuole vary widely; during starvation of P ,vacuolar Pi is almost undetectable, also vacuolar concentration of P increases with improving level of P. When the Pi supply is limited, more rootsgrows, that enhances the uptake rate of roots from the soil, deplete the vacuolar concentration by retranslocating Pi from older leaves. when plants have more Pi supply then plants absorbing it at rates that exceed demand, various methods act to stop the accumulation of toxic concentration of Pi . These methods include the conversion of Pi into storage compounds e.g. phytic acid, a decrease in the Pi uptake rate from the soil.

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