apical placentation

Thân thiện

A single ovule attaches at the apex of the ovary in apical placentation.

Definition

Noun (Botany) A type of placentation in flowering plants where one or a small number of ovules are attached at the apex (the top) of a simple or compound ovary.

Usage

This is a specific botanical term used to describe the arrangement and attachment point of ovules within the ovary of a flower. It is a technical descriptor of plant morphology.

Examples

• In the family Ranunculaceae, many species exhibit apical placentation.
• The botanist identified the flower's structure, noting its apical placentation.
• Apical placentation is less common than other types, such as parietal or axile placentation.

Advanced Usage

• The term is primarily used in scientific descriptions, taxonomic keys, and botanical literature.
• It can be contrasted with other placentation types: (at the base), (on the ovary wall), (on the central axis), and (on a central column).

Variants and Related Words

• Placentation (n): The general term for the arrangement of ovules within the ovary.
• Apical (adj): Relating to or located at the apex or tip.
• Ovule (n): The structure that develops into a seed after fertilization.
• Ovary (n): The part of the pistil that contains the ovules.

Synonyms

• Terminal placentation (This is a less common but acceptable synonym in botanical contexts.)

Related Phrases/Concepts

• Simple ovary: An ovary formed from a single carpel.
• Compound ovary: An ovary formed from two or more fused carpels.
• Gynoecium: The female reproductive part of a flower, consisting of one or more pistils.

Học thuật

Noun

1. where one or few ovules develop at the top of a simple or compound ovary