The vascular tissue system consists of a number of vascular bundles which are found to be distributed in the stele. The stele is the central cylindrical portion of the stem and root, commonly surrounded by endodermis, and consists of vascular bundles, pericycle, pith and medullary ray. Each vascular bundle consists …

This is the second portion of the topic Photoperiodism. If you have somehow missed the first part, don’t worry! Here is the link- Photoperiodism: Flowering in plants (Part 1) The Pigment Reference: Fundamentals of Plant Physiology by Dr. V. K. Jain.

Probability means the possibility of a random phenomena.