Question

Question 7 (1 point) Why are nutrient concentrations in the soil DIFFERENT from those in the water found in root xylem? root hairs cannot take in nutrients, only water the cortex cells transport nutrients and water toward vascular tissues sieve plates filter out nutrients during translocation the endodermis is selective and uses active transport to move nutrients

Answer 1

CORRECT STATEMENTS AS PER OPTIONS

Root hairs transport water as well as nutrients

The cortex cells transport nutrients and water towards vascular tissues

Sieve plates filter out nutrients during translocation

The endodermis is selective but uses OSMOSIS OR SIMPLE DIFFUSION to move nutrients

EXPLANATION

The endodermal layer in a plant, almost always in the root, regulates the water and other substances that get into the plant. The endodermis is a single layer of cells that borders the cortex of a root. The whole system in which the endodermis functions allows the roots to select what gets into the vascular core.

The nutrient concentrations in the soil are different than those in water found in the xylem is because of several reasons viz.

1: Plants absorb water from the soil by osmosis whereas they absorb mineral ions by active transport, against the concentration gradient. (ACTIVE TRANSPORT)

2: Root hair cells are adapted for taking up water and mineral ions by having a large surface area to increase the rate of absorption. They also contain lots of mitochondria, which release energy from glucose during respiration in order to provide the energy needed for active transport.

3: The absorbed water is transported through the roots to the rest of the plant where it is used for different purposes.

4: The cortex cell transport nutrients and water towards vascular tissues as shown in the diagram

5. water moves along xylem into leaf _ -6. water evapourates into air spaces in spongy mesophyll 7. water vapour escapes through stomata (in other words, the leaf transpires) xylem of stem- -4. water is drawn up xylem in the stem (transpiration stream) stem root soil water 3. water enters xylem in root 1. water enters root hairs by osmosis 2. water crosses root cortex by osmosis and diffusion

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