Write the function of phloem tissue
answer in one sentence
Answers
Transport in biology means carrying substance absorbed or made in the body of an organism to all other parts of its body. In plants, it is only water and minerals that need to be transported to its other parts. Another thing that needs to be transported to other parts of the plants is the food prepared in leaves.
Complete answer:
Phloem is an elongated, tubular shape with thin-walled sieve tubes vascular tissue. Its function is the transportation of food and nutrients such as sugar from leaves to other parts of the plant. This movement of substances is called translocation.
Additional Information:
Phloem is the food transporting component of the plant. It includes 4 component and they are:
1. Sieve tube elements:
-They are long tube-like structures arranged longitudinally.
-They are found in association with companion cells.
-The end walls are perforated in a sieve manner to form sieve plates.
-Each cell lacks a nucleus.
- It has a large vacuole and a peripheral cytoplasm.
2. Companion Cells:
-Companion cells are specialised parenchymatous cells.
-They help in maintaining the pressure gradient in the sieve tubes.
-Nuclei of the companion cells control the function of the sieve tubes.
3. Phloem Parenchyma:
-The cells are cylindrical, elongated with tapering ends and dense cytoplasm and nucleus. The cells are connected to each other by plasmodesmata connections.
-The cell wall is composed of cellulose.
-It is absent in monocotyledons.
4. Phloem Fibres:
-They are also called bast fibres.
-They are made of sclerenchymatous cells.
-Phloem fibres are absent in the primary phloem but present in the secondary phloem.
-Fibres are elongated, unbranded and bear pointed apices.
-The cell walls are thick.
-They lose their protoplasm at maturity and become dead.
-The fibres of jute, hemp and flax are of commercial use.