explain the types of parenchyma tissues with their functions
Answers
, following types of parenchyma can be recognised.
●Chlorenchyma is the parenchyma in which the cells contain large number of chloroplasts. Chlorenchyma takes part in photosynthesis. It occurs in the leaves and other green parts of the plant body.
●Prosenchyma is a type of parenchyma where cells are elongated with tapering ends.
●Arenchyma is the parenchyma in which the cells enclose large intercellular spaces that are filled with air. Aerenchyma helps in buoyancy and respiration. It is characteristically found in aquatic floating plants.
●Vascular parenchyma is the parenchyma, which is found associated with the vascular tissues xylem and phloem. Accordingly, it is distinguished into xylem parenchyma and phloem parenchyma.
●Medullary parenchyma is the parenchyma, which is found radially arranged in between the vascular bundles in the stem. It is meant for storage of reserve food.
●Conjunctive parenchyma is the parenchyma, which occurs in the root system. It is specially meant for storage of water.
●Armed parenchyma is the parenchyma, which is found in the epidermis of leaves in some gymnosperms. The cells have many spiny projections. It is defensive in function.
Parenchyma
- it is a permanent tissue with large vacuole, dense cytoplasm, thin cell wall and intercellular spaces between them so they are loosely packed.
- it is also known as universal tissue as it is the first permanent tissue evolved and is present in all soft parts of the plants.
- it provides support to plant, turgidity to cells and stores food.
- it is of mainly 3 types
a) Chlorenchyma- it is a type of permanent tissue which has many chloroplasts. It's function is to synthesise food.
b) Aerenchyma- it is a type of permanent tissue with air filled in intercellular spaces. It's function is to provide buoyancy ( for floating ).
c) Sclerenchyma- it is a type of permanent of tissue with tapering ends. It is present in the pericycle of roots.