NEET BIOLOGY

Detailed explanation-1: -Solution. Pith is well developed in the monocots and is small, inconspicuous in dicots . In monocot, there is no secondary growth due to the absence of vascular cambium between the xylem and phloem. But secondary growth is the characteristic of dicotyledonous plants.

Detailed explanation-2: -In monocotyledonous root, pith is large and well developed. Radial vascular bundles, single layered endodermis, large pith and conjuctive tissue in between xylem and phloem are all characteristics of dicot root.

Detailed explanation-3: -Secondary growth does not occur in monocots as their vascular bundles are closed and they lack cambium. Cambium is the only meristematic tissue in the stem and the root that can trigger the secondary growth.

Detailed explanation-4: -So, the correct answer is ‘Monocot root and dicot stem’

Detailed explanation-5: -Solution : In a dicot stem, a well developed pith (made of parenchymatous or occasionally sclerenchymatous cells) is present whereas in a monocot stem, pith is absent. In a dicot well developed pith is present.