IB Biology Topic B3.1.10 Stomatal Density Revision Notes (SL/HL)

IB Biology Topic B3.1.10 Stomatal Density Revision Notes (SL/HL) | RevisionDojo

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Stomatal Density Is the Number of Stomata Per Unit of Leaf Area

Definition

Stomata

Stomata are small openings on the leaf surface that regulate gas exchange and water loss in plants

Stomatal density is the number of stomata per unit area of leaf surface, usually given per mm².
Stomata and guard cells are microscopic, so a microscope is needed to count them.

Two Ways to Get a Surface Sample: Peel the Epidermis or Take an Impression

Peeling the epidermis: strip off a piece of the lower epidermis and mount it in water on a slide.
1. Fold or tear the leaf to expose a thin epidermal layer.
2. This works well for plants such as Commelina and Tradescantia.
Nail-varnish impression: paint clear nail varnish on the leaf, let it dry, then peel off the cast.
1. The cast holds an imprint of the stomata and cell outlines.

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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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Stomatal Density Is the Number of Stomata Per Unit of Leaf Area

Definition

Stomata

Stomata are small openings on the leaf surface that regulate gas exchange and water loss in plants

Stomatal density is the number of stomata per unit area of leaf surface, usually given per mm².
Stomata and guard cells are microscopic, so a microscope is needed to count them.

Two Ways to Get a Surface Sample: Peel the Epidermis or Take an Impression

Peeling the epidermis: strip off a piece of the lower epidermis and mount it in water on a slide.
1. Fold or tear the leaf to expose a thin epidermal layer.
2. This works well for plants such as Commelina and Tradescantia.
Nail-varnish impression: paint clear nail varnish on the leaf, let it dry, then peel off the cast.
1. The cast holds an imprint of the stomata and cell outlines.

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.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B3.1.10: Stomatal Density Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Stomatal Density Is the Number of Stomata Per Unit of Leaf Area

Two Ways to Get a Surface Sample: Peel the Epidermis or Take an Impression

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

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Stomatal Density Is the Number of Stomata Per Unit of Leaf Area

Two Ways to Get a Surface Sample: Peel the Epidermis or Take an Impression

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