NEET BIOLOGY

Detailed explanation-1: -Secondary xylem also known as wood is produced by the vascular cambium layer of cells. Bark comprises all the tissues external to the vascular cambium, therefore, secondary xylem is not present in the bark.

Detailed explanation-2: -The outer bark contains secondary xylem whereas the inner bark contains secondary phloem. The inner bark accumulates dead tissues and the outer bark sloughs off dead tissues.

Detailed explanation-3: -Solution : Bark is a non-technical term that refers to all tissues exterior to vascular cambium viz. periderm (cork cambium, cork and secondary cortex) and secondary phloem.

Detailed explanation-4: -The inner bark, which in older stems is living tissue, includes the innermost area of the periderm. Primary xylem is the xylem that is formed during the primary growth from procambium of apical meristems is also present in the bark, So the correct option is ‘primary xylem and periderm’.

Detailed explanation-5: -Answer and Explanation: Bark is composed of secondary phloem and the periderm. Xylem is a component of wood. Bark is the outermost layer in woody plants that is composed of the stems and the roots.