AP BIOLOGY

Detailed explanation-1: -Here, phloem parenchyma acts as both packaging material as well as transfer cells. The parenchyma cells in the phloem tissue are known as phloem parenchyma and of two types such as companion cells and albuminous cells. The parenchyma cells fill the gaps between other cells therefore known as packaging cells.

Detailed explanation-2: -Parenchyma cells are essential for activities like photosynthesis, storage, secretion, assimilation, respiration, excretion and radial transport of water and solute.

Detailed explanation-3: -Parenchyma serves as packing tissue to fill the spaces between other tissues. It stores waste materials of plants such as gum, crystals etc. The intercellular air spaces of parenchyma cells allow gaseous exchange.

Detailed explanation-4: -Parenchyma cells contain a nucleus and when they are first formed, they are densely cytoplasmic and have several small vacuoles. However, in older parenchyma cells the vacuoles merge into one large central vacuole with the cytoplasm and organelles-like these chloroplasts on the edges of the cell.