Problem 3 Distinguish among procambium, va... [FREE SOLUTION]

Chapter 6: Problem 3

Distinguish among procambium, vascular cambium, and cork cambium.

Short Answer

Expert verified

Procambium forms primary vascular tissues, vascular cambium provides secondary growth, and cork cambium creates the protective periderm.

Step by step solution

Understanding Procambium

Procambium is a type of meristematic tissue found in the growing regions of plants. It is the primary tissue that differentiates into primary xylem and primary phloem, which are the primary vascular tissues responsible for water and nutrient transport.

Understanding Vascular Cambium

Vascular cambium is a lateral meristem found in plants that contributes to secondary growth, i.e., an increase in girth. It produces secondary xylem (wood) and secondary phloem, which enhance the plant's ability to transport water and nutrients efficiently.

Understanding Cork Cambium

Cork cambium, also known as phellogen, is another lateral meristem that forms in the cortex of stems and roots. It gives rise to the periderm, which replaces the epidermis in woody plants, providing protection and reducing water loss.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Procambium

The procambium plays a vital role in plant development by being one of the meristematic tissues, which are regions of active cell division in plants. This tissue is particularly important during the initial stages of plant growth. It is found in the shoot apical meristem, root apical meristem, and leaf primordia. From the procambium, cells differentiate into primary vascular tissues, specifically:

Primary xylem: Responsible for water transportation from roots to leaves.
Primary phloem: Transports nutrients and organic compounds, like sugar, throughout the plant.

Procambium is crucial for creating the pathways that ensure young plants have the structure and means to transport essential substances. This function is a key distinction from other cambiums, as it focuses on forming the initial vascular network.

Vascular Cambium

Vascular cambium is a pivotal feature of woody plants, aiding greatly in the plant's secondary growth, which is the increase in thickness and girth. Positioned between the primary xylem and primary phloem, vascular cambium plays a continuous role throughout the plant's life after the initial stage. Its contributions include:

Secondary xylem (wood): Provides structural support and increased capacity for water transportation.
Secondary phloem: Enhances the movement of nutrients throughout the plant.

This tissue's activity thickens stems and roots, allowing the plant to become sturdy and withstand environmental stressors while increasing its efficiency in resource transport.

Cork Cambium

Cork cambium, or phellogen, is essential for protective growth in plants. Unlike the vascular cambium, the cork cambium forms part of the plant's outer defense system. It's located in the cortex region of the plant and is critical for developing the periderm. The periderm, in turn, replaces the epidermis in woody plants over time. Key functions include:

Producing cork (or phellem): A waterproof layer that prevents water loss and protects against physical damage.
Developing phelloderm: A thin layer of living tissue inside the cork, contributing to the periderm.

Cork cambium ensures the plant remains protected from desiccation and external damage by creating a hardened, durable outer layer. It is most active in regions that undergo significant environmental exposure, emphasizing its role in plant survival.

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Distinguish among procambium, vascular cambium, and cork cambium.

Short Answer

Step by step solution

Understanding Procambium

Understanding Vascular Cambium

Understanding Cork Cambium

Key Concepts

Procambium

Vascular Cambium

Cork Cambium

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