NEETBotanyAnatomy of Flowering Plants
Why are vascular bundles in dicotyledonous stems referred to as open?
Options
- ABecause they possess the ability to form secondary xylem and phloem tissues
- BBecause they have no cambium present in them
- CBecause they are jointly situated along the same radius of vascular bundles
- DBecause they are arranged in an alternate manner along the different radii
Correct answer
A. Because they possess the ability to form secondary xylem and phloem tissues
Step-by-step solution
The vascular system consists of complex tissues,the phloem and the xylem.The xylem andphloem together constitute vascular bundles. In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues, and hence are called open vascular bundles. In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as close