Definition

1. Noun:
   • A microscopic tubular extension of a root's epidermal cell: A "root hair" is a very thin, hair-like projection that grows from an epidermal cell located near the tip of a plant root. Its primary function is to significantly increase the surface area of the root for the absorption of water and mineral nutrients from the soil.

Usage

• Noun:
  • The root hair is essential for a plant's uptake of water and dissolved minerals.
  • The delicate structure of a root hair allows it to penetrate between soil particles.
  • Damage to the root hairs can impair a plant's ability to absorb nutrients effectively.

Examples

• Noun:
  • The formation of a root hair greatly increases the root's absorptive surface.
  • Scientists observed the root hairs under a microscope to study nutrient absorption.
  • Water enters the plant primarily through the root hairs.

Advanced Usage

• "Root hair development": Refers to the biological process by which root hairs form and elongate from specific epidermal cells.

  • The study focused on the genes controlling root hair development.

• "Root hair zone": The region of a young root just behind the growing tip where root hairs are most abundant and active.

  • Nutrient absorption is most efficient in the root hair zone.

Variants and Related Words

• Root epidermis (n): The outermost layer of cells covering the root, from which root hairs originate.
• Trichoblast (n): The specific epidermal cell that gives rise to a root hair.
• Rhizosphere (n): The narrow region of soil directly influenced by root secretions and associated microorganisms, which is intimately contacted by root hairs.

Synonyms

• Absorptive hair: A descriptive synonym emphasizing the primary function.
• Root trichome: A more technical botanical term, though "trichome" can refer to hair-like structures on other plant parts as well.

Related Phrases

• Root hair elongation: The process by which a root hair grows in length.

  • Soil moisture levels can affect the rate of root hair elongation.

• Root hair deformation: A change in the normal shape or structure of root hairs, often in response to pathogens or symbionts like nitrogen-fixing bacteria.

  • The bacteria caused root hair deformation as part of the infection process.

Noun

1. thin hairlike outgrowth of an epidermal cell just behind the tip; absorbs nutrients from the soil