Introduction to Vascular Tissue System
The vascular tissue system contains phloem and xylem. The xylem and phloem's elements are all the time organized in groups. They are termed as vascular bundles. The vascular bundle contains cambial tissue among the xylem and phloem in dicot stem. Such type of vascular bundle is termed as open vascular bundle. In monocot stem, cambium is not present in the vascular bundle; therefore it is termed as closed vascular bundle.
In roots, xylem and phloem are arranged in an alternate way on dissimilar radii. It is termed as radial arrangement. In stems and leaves, xylem and phloem are arranged at similar radius and create a vascular bundle together. Such type of vascular bundle is termed as conjoint vascular bundle. Relies on the mutual relationship of xylem and phloem, conjoint vascular bundles are separated into 3 types.
They are as follow:
2. Bicollateral and
Diagram: Various types of vascular bundles
In a vascular bundle if xylem and phloem are arranged together with similar radius with phloem in the direction of the outside, such type of vascular bundle is termed as collateral vascular bundle. If phloem takes place on both the outer and inner sides of xylem, the bundle is termed as bicollateral. Bicollateral vascular bundles are most usually seen in Cucurbitaceae.
The bundle where either phloem surrounds the xylem / xylem surrounds the phloem totally is termed as concentric vascular bundle. This is of two kinds
1. amphicribral and
In the first type the amphicribral concentric vascular bundles; the phloem totally surrounds the xylem. Example: Polypodium.
In the second type amphivasal concentric vascular bundles, the xylem totally surrounds the phloem. Example: Acorus. In roots, protoxylem vessels are exists in the direction of the periphery and the metaxylem vessels towards the centre. This arrangement of xylem is termed as exarch. In stem, protoxylem vessels are in the direction of the centre, when metaxylem in the direction of the periphery. This condition is termed as endarch.
Latest technology based Biology Online Tutoring Assistance
Tutors, at the secure.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Vascular Tissue System homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Vascular Tissue System, project ideas and tutorials. We provide email based Vascular Tissue System homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Vascular Tissue System. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Biology homework help and assignment help services. They use their experience, as they have solved thousands of the Biology assignments, which may help you to solve your complex issues of Vascular Tissue System. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.