question_answer 35)

  The plant cell cytoplasm is surrounded by both cell wall and cell membrane. The specificity of transport of substances are mostly across the cell membrane, because......... .

Answer:

                  The transport takes place by the cell membrane because cell membrane issemi-permeable and composed of lipids that are arranged in bilayer structure along withproteins and carbohydrate. The lipid soluble molecules pass readily across lipid bilayer of cell membrane whereasmovement of other molecules of small size is facilitated by porins, pores made up ofproteins. While cell wall does not helps in transport of substances because it. Cell wall is basically a non-living rigid structure forming outer covering over plasmamembrane and it provides shape, mechanical strength and protection to the plant cell fromdamages and infection.