Question

8. The path of upward transportation of water is through
(a) Phloem
(b) Xylem walls
(c) Xylem lumen
(d) Cortex​

Answer 1

Answer:

xylem

the upward movement of water and minerals are known as xylem and the food which plant made is carried by phloem..

Answer 2

Answer:

The path of upward transportation of water is through (c) Xylem lumen.                                  

Explanation:

• The ascent of sap refers to the upward translocation of water and minerals from the root to the tip through the xylem tissue of plants.

• It translocates the sap (dilute solution of mineral ions)from the roots to the top of the plant. Hence the name "ascent of sap"
• Further, the upward movement of water takes place through xylem cells while the phloem transports food from the leaves to the rest of the plant.
• The xylem tracheary elements i.e. tracheids & vessels consist of long tubes which are continuous from the roots to the leaves.
• They are reinforced with lignin making them very strong or non-collapsible. This enables them to sustain high pressures without collapsing. Lignin also renders them impermeable to water.
• They have narrow lumens which provide a large surface area that enhances the force of adhesion between the water molecules and their inner surface. This helps to pull the long water columns.
• Their contents are non-living/ dead which helps to lessen resistance to water flow.

Hence the correct answer is option c) xylem lumen.

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