Question

Pith cavity occurs in the stem of
A. Helianthus
B. Zea mays
C. Cucurbita
D. Dracaena

Answer 1

If we see In the centre of the stem there is a cavity known as pith, in which the vascular bundles are embedded in its outer zone. It is made up of polygonal oval shaped or rounded parenchyma cells which enclose intercellular spaces.

Complete answer:
Pith or we may call it medulla, is a tissue in the stems of vascular plants.Pith is composed of soft, spongy parenchyma cells, which store in themselves and transport nutrients throughout the plant. In trees pith is generally present in young growth, but in the trunk and older branches the pith often gets replaced - in great part - by xylem. If we compare stems to roots- roots also have pith. It consists of lots of cortex and little pith. Both regions include cells that store photosynthetic products. The cortex is situated between the epidermis and the vascular tissue, whereas the pith lies between the vascular tissue and the center of the root.

Pith is generally present in dicot plants Dicot stems have bundles in a ring surrounding parenchyma cells in a pith region. The roots of dicot plants have their xylem in the center of the root and phloem outside the xylem. There is no pitch present in the monocots. Monocot roots have their vascular bundles arranged in a ring.

Hence, the correct answer is option (C).

Note: The dicotyledons, also called as dicots, were one of the two groups of flowering plants or angiosperms. The name refers to one of the characteristics of the group, namely that the seed has two embryonic leaves or cotyledons.