d Minerals from Root Hairs to the Xylem membranes of endodermal cells before gai

Question

d Minerals from Root Hairs to the Xylem membranes of endodermal cells before gaining entrance into the vascular cylinder Submit Reguest Answer Part D The concentrations of some essential minerals are much higher in the vascular cylinder of roots than in the soil solution around the roots What is the best explanation for this observation? O Essential minerals are also needed by other organisms in the soil, depleting the minerals in the soil Essential minerals accumulate in the apoplast reaching higher concentrations than in the soil. O Some essential minerals are taken into the symplast by active transport O Essential minerals are actively transported into the vascular cylinder by the Casparian strip Submit Reguest Aiswer Part E Some plant species are used for phytoremediation because when grown in soil contaminated by heavy metals and other pollutants they

Explanation / Answer

Part D-- Ans. Option 2 -- Essential minerals accumulate in the apoplast reaching higher concentration than in the soil.

Reason--  In apoplastic transport water and minerals flow in an upward direction via the apoplast to the xylem in the roots. The apoplastic pathway is also involved in passive exclusion . This means that some of the solutes that enter the root do not reach the xylem and are excluded by the plasma membrane of the endodermal cells. Hence , they accumulate and their concentration becomes higher than the surrounding soil.

Part E -- Ans-- Option 3- Hyper accumulators would have contaminants in the cortex and vascular cylinder , and non-accumulators would have contaminants in the cortex but not the vascular cylinder.

Reason-- Hyperaccumulators are the plants which can grow in soils with high concentration of metals and are capable of absorbing these metals and accumulating them in their tissues. They extract metals at a higher rate than non accumulators and store them in their roots and shoots.

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