heterospory

Thân thiện

Heterospory is illustrated by a fern producing two distinct types of spores.

Definition

Heterospory (noun) The condition in certain plants, especially some pteridophytes (like ferns) and all seed plants, of producing two distinct types of spores: microspores (which develop into male gametophytes) and megaspores (which develop into female gametophytes). This is a key evolutionary step towards seed formation.

Usage and Examples

• Heterospory is a significant adaptation that distinguishes seed plants from many primitive vascular plants.
  • Example: The evolution of heterospory was a major step in plant reproductive biology.
• The term describes a biological characteristic.
  • Example: Selaginella exhibits heterospory, producing both microspores and megaspores.

Advanced Usage

• Heterospory is contrasted with homospory, the condition of producing only one type of spore.
  • Example: Most ferns are homosporous, while the aquatic fern Marsilea shows heterospory.

Variants and Related Words

• Heterosporous (adjective): Describing a plant that exhibits heterospory.
  • Example: Pine trees are heterosporous plants.
• Microspore (noun): The smaller spore type, giving rise to a male gametophyte.
• Megaspore (noun): The larger spore type, giving rise to a female gametophyte.

Synonyms

• There are no direct single-word synonyms. The concept is described as "the production of two spore types" or "sexual differentiation of spores."

Related Concepts (Not Phrasal Verbs or Idioms)

• Gametophyte: The haploid, gamete-producing phase in the plant life cycle, which develops from a spore.
• Sporophyte: The diploid, spore-producing phase in the plant life cycle.
• Seed Habit: The reproductive strategy of seed plants, for which heterospory is a fundamental prerequisite.

Học thuật

Noun

1. the development of both microspores and megaspores