NEET BIOLOGY

Detailed explanation-1: -Casparian strip is a band of cell wall material deposited on the radial and transverse walls of the endodermis and is chemically different from the rest of the cell wall. The cell wall being made of lignin and without suberin, whereas the Casparian strip is made of suberin and sometimes lignin.

Detailed explanation-2: -The compounds deposited in the Casparian strips are suberin, lignin and some structural proteins, which are capable of reducing the diffusive apoplastic flow of water and solutes into the stele.

Detailed explanation-3: -transport function …into roots is the so-called Casparian strip, a conspicuously thickened wall area one cell layer deep surrounding primary roots; it prevents excess soil solution from being pulled directly into the central part of the root where the xylem is located.

Detailed explanation-4: -Early in the development of the endodermis, suberin (a fatty substance) is deposted in bands on the transverse walls and radial walls in the longitudinal direction, forming the casparian strip (Fig. 14.6).

Detailed explanation-5: -Casparian strip A band of waterproof, corky tissue that is found on the side and walls of the endodermis of roots. The strip prevents water from entering the pericycle except through the cytoplasm of endodermal cells; this may be important in producing root pressure.