Question

Though chlorenchyma, Aerenchyma, and storage tissues are parenchyma in nature, why do they have different (specific) names?

Answer 1

Plant body contains both simple and complex permanent tissues. Simple permanent tissues include parenchyma, collenchyma, and sclerenchyma. Chlorenchyma, aerenchyma, and certain storage tissues are parenchymatous tissues. They are called so because of the special functions they perform and the structures they possess.

Complete answer: Parenchyma forms most of the plant body. We know that they contain living cells with a thin cell wall and more cytoplasm. They are of several shapes according to the function they perform. Functions of the parenchyma tissue include photosynthesis, food storage, and secretion.
We know that the cell wall of the cells of this tissue is cellulosic in nature. It is an example of living permanent tissue in plants.
Chlorenchyma is actually parenchyma that contains chloroplasts in it, Because of this reason, chlorenchyma is able to perform photosynthesis. It is a process by which food is produced by the plants using sunlight, water, carbon dioxide, etc.
Aerenchyma is also a parenchyma tissue that has several air spaces in between cells. This feature enables these tissues to float in water. It is seen in many aquatic plants.
Several of the plant storage tissues are parenchyma. Xylem parenchyma is a parenchymatous tissue that performs the function of storing food materials. Xylem parenchyma stores starch and fat in it. Phloem parenchyma is also parenchyma tissue that has the ability to store food and other substances like resins, latex, and mucilage.

Note: Xylem parenchyma belongs to two categories. They are ray parenchyma and axial parenchyma. Ray parenchyma helps in radial conduction and axial parenchyma has the ability for the longitudinal conduction of water and minerals.
The phloem parenchyma is absent in most of the monocots and some herbaceous plants.