Question

In the diagram of T.S. stele of dicot root, the different parts have been indicated by alphabets. Choose the correct combination.

• A. a- pericycle, b-conjunctive tissue, c-metaxylem, d-protoxylem, e-phloem, f-pith
• B. a-endodermis, b-conjunctive tissue, c-protoxylem, d-metaxylem, e-phloem, f-pith
• C. a-endodermis, b-conjunctive tissue, c-metaxylem, d-protoxylem, e-phloem, f-pith
• D. a-endodermis, b-pith, c-protoxylem, d-metaxylem, e-phloem, f-conjunctive tissue

Answer 1

Answer: (B)

a-endodermis, b-conjunctive tissue, c-protoxylem, d-metaxylem, e-phloem, f-pith

In the stele of dicot root, outer most part is the pericycle, and inner vascular bundles medulla, conjunctive tissue is present. Vascular bundles are radial with exarch xylem. Tetrarch stele is present, means stele with four xylem strands. Medulla is reduced due to extensive growth of xylem into the centre.

Parenchyma tissue present between xylem and phloem is called Conjunctive tissue. So, in the transverse section of dicot root stele shows, outer pericycle, followed by vascular bundles, conjunctive tissue and medulla. Endodermis is present outer to the stele.

So, the correct option is "a- endodermis,, b-conjunctive tissue c-metaxylem d-protoxylem, e-phloem, f-pith'.