Question

Write contents of phloem and its function?¿

Answer 1

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Sieve tubes, companion cells, phloem fibres and phloem parenchyma are the components of phloem.

Function of sieve tubes:

• Translocation of organic substances through perforated walls from one adjacent cell to another.

Function of companion cells:

• Help to control the activity of sieve tube elements.

Function of phloem parenchyma:

• Transports food, i.e. sugars and amino acids from leaves to other non-green parts of plants such as growing stems and roots.

Function of phloem fibres:

• Provide mechanical strength to the plant

Answer 2

Answer:

Phloem is a vascular tissue of a plant (along with xylem).

Its contents include various specialized cells called sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells.

>Function(s) of:-

• Sieve tubes: The main functions include maintaining cells and transporting necessary molecules (carbohydrates) with the help of companion cells throughout the plant.
• Companion cells: These cells move sugar and amino acids into and out of the sieve elements. Their functions also include phloem loading and unloading, long-distance transport, and a quality control center for monitoring the nature of substances passing into and out of the phloem.
• Phloem fibres: It is the tissue that carries out the function of translocation. For example, the process of transporting photosynthate materials from the photosynthetic plant organs to other various parts of the plant. It also provides mechanical strength to the plant.
• Phloem parenchyma cells: Called transfer cells and border parenchyma cells, these are located near the finest branches and terminations of sieve tubes in leaf veinlets, where they also function in the transport of foods.

(In the end, the MAIN function of phloem is to transport food and nutrients throughout the plant)

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[I hope this is right and helps]