IB Biology Topic B3.2.9 Distribution of Tissues in a Transverse Section of the Stem of a Dicotyledonous Plant Revision Notes (SL/HL)

IB Biology Topic B3.2.9 Distribution of Tissues in a Transverse Section of the Stem of a Dicotyledonous Plant Revision Notes (SL/HL) | RevisionDojo

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A Dicot Stem Has Its Vascular Bundles in a Ring

A transverse section of a dicotyledonous (dicot) stem shows tissues arranged for support, transport, and protection.
From outside in, the main tissues are the epidermis, the cortex, a ring of vascular bundles, and the central pith.

Note

In dicots, the vascular bundles sit in a ring near the outside of the stem.
In monocots, by contrast, the bundles are scattered throughout the stem.

Each Tissue Has a Position and a Job

Epidermis
1. The outermost single layer of cells, forming the outer surface of the stem.
2. It protects the plant, reduces water loss with a waxy cuticle, and acts as a barrier to pathogens.
Cortex
1. The layer just beneath the epidermis, surrounding the ring of vascular bundles.
2. It stores starch and gives the stem some structural support.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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A Dicot Stem Has Its Vascular Bundles in a Ring

A transverse section of a dicotyledonous (dicot) stem shows tissues arranged for support, transport, and protection.
From outside in, the main tissues are the epidermis, the cortex, a ring of vascular bundles, and the central pith.

Note

In dicots, the vascular bundles sit in a ring near the outside of the stem.
In monocots, by contrast, the bundles are scattered throughout the stem.

Each Tissue Has a Position and a Job

Epidermis
1. The outermost single layer of cells, forming the outer surface of the stem.
2. It protects the plant, reduces water loss with a waxy cuticle, and acts as a barrier to pathogens.
Cortex
1. The layer just beneath the epidermis, surrounding the ring of vascular bundles.
2. It stores starch and gives the stem some structural support.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B3.2.9: Distribution of Tissues in a Transverse Section of the Stem of a Dicotyledonous Plant Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

A Dicot Stem Has Its Vascular Bundles in a Ring

Each Tissue Has a Position and a Job

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A Dicot Stem Has Its Vascular Bundles in a Ring

Each Tissue Has a Position and a Job

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account