gemma

/'dʤemə/

Thân thiện

A student examines a gemma under a microscope in biology class.

Definition

1. Noun:
   • A small asexual reproductive structure in certain plants: A gemma is a small, multicellular, asexual reproductive structure found in some non-vascular plants, such as liverworts and mosses. It detaches from the parent plant and can grow into a new, genetically identical individual.

Examples of Usage

• Noun:
  • The botanist observed the gemmae on the surface of the liverwort thallus.
  • In mosses, a gemma can be dispersed by water droplets to colonize new areas.

Advanced Usage

• "Gemma cup": A specialized structure on some liverworts that produces and contains gemmae.
  • The gemmae are produced in the gemma cups on the gametophyte.

Variants and Related Words

• Gemmae (n): The plural form of gemma.
  • Under the microscope, numerous gemmae were visible.
• Gemmation (n): The process of reproduction or budding by means of gemmae.
  • Gemmation is a common form of asexual reproduction in bryophytes.

Synonyms

• Bud: A general term for a small growth that can develop into a new plant; in this specific botanical context, a gemma is a type of bud.
• Propagule: A vegetative structure that can detach and give rise to a new plant.

Related Terms (Not Phrasal Verbs or Idioms)

• Asexual reproduction: A mode of reproduction not involving the fusion of gametes, which is how a gemma functions.
• Bryophyte: A group of plants including mosses and liverworts, where gemmae are commonly found.

Học thuật

Noun

1. small asexual reproductive structure in e.g. liverworts and mosses that detaches from the parent and develops into a new individual