Question

define the following terms (a)middle lamellae
(b)Plasmodesmata​

Answer 1

a narrow thread of cytoplasm that passes through the cell walls of adjacent plant cells and allows communication between them.

Explanation:

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Answer 2

(a)  The middle lamella is a layer which cements the cell walls of two adjoining plant cells together. ... The middle lamella is made up of calcium and magnesium pectates. In a mature plant cell it is the outermost layer of cell wall. In plants, the pectins form a unified and continuous layer between adjacent cells.

(b) Between plant cells, we see the formation of plasmodesmata. A plasmodesma (plural plasmodesmata, singular plasmodesma) is a channel through the cell wall that allows molecules and substances to move back and forth as needed.