Dermal Tissue Function in Plants: Quiz and Flashcards

Study Notes

Dermal Tissue in Plants

Dermal tissue is the first line of defense against physical damage and pathogens in plants.
It includes the epidermis, trichomes, stomata, and cuticle, which play crucial roles in protection, gas exchange, and water regulation.

Structure and Function of Dermal Tissue

The epidermis is the outer layer of dermal tissue, providing protection against physical damage and pathogens.
It regulates transpiration, controlling water loss from the plant's surface.
The epidermis also facilitates gas exchange, allowing for photosynthesis and respiration.

Cuticle

The cuticle is a waxy layer on the epidermis, primarily composed of cutin.
It prevents excessive water loss and protects against pathogens.
The cuticle's thickness varies based on environmental conditions.

Stomata

Stomata are openings on the epidermis for gas exchange, allowing for the uptake of carbon dioxide and release of oxygen during photosynthesis.
They also enable the plant to regulate water loss through transpiration.
Guard cells control the opening and closing of stomata, responding to environmental conditions.

Trichomes

Trichomes are hair-like structures on the epidermis, protecting the plant from herbivores and reducing water loss.
They can reflect sunlight, reducing heat stress on the plant.
Some trichomes secrete substances that deter herbivores or attract beneficial insects.

Root Hairs

Root hairs are tubular extensions of individual epidermal cells, greatly increasing the root's surface area and efficiency of absorption.

Periderm

The periderm is a protective layer in woody plants, consisting of cork cells, cork cambium, and phelloderm.
It acts as a physical barrier against environmental stressors, pathogens, and dehydration.
The periderm provides structural support and insulation, aiding in the longevity and resilience of the plant's woody stems and roots.

Role of Dermal Tissue in Plant Defense

The epidermis and cuticle act as a physical barrier, preventing pathogens from entering the plant.
Specialized cells in the epidermis produce chemical compounds that deter herbivores and pathogens.
The dermal tissue shields the plant from extreme temperatures, UV radiation, and water loss.

Importance of Dermal Tissue in Water Regulation

The epidermis and cuticle of dermal tissue help prevent excessive transpiration, conserving water.
Stomata in the epidermis enable controlled release of water vapor, maintaining proper hydration levels.
The intact dermal tissue acts as a barrier against microbial invasion, preventing water loss due to infections.

Significance of Dermal Tissue in Plant Survival

Dermal tissue plays a crucial role in plant survival, acting as the first line of defense against environmental stressors and pathogens.
It prevents water loss, regulates gas exchange, and provides protection.

Description

Explore the structure and function of dermal tissue in plants which acts as a protective barrier against physical damage and pathogens. Learn about the epidermis, trichomes, stomata, and their roles in water regulation and absorption.