Dictionary > Dicotyledon

Dicotyledon

Definition
noun, plural: dicotyledons
A group of flowering plants belonging to the class Magnoliopsida of Angiospermae (angiosperms), characterized by having two photosynthetic cotyledons in the seed that may emerge from the ground when the seed germinates.
Supplement
Examples of dicotyledonous plants are beans, buttercups, oaks, sunflowers, etc.
The angiosperms (the flowering plants) can either be a monocotyledon (or monocot) or a dicotyledon (or dicot) according to the number of cotyledons in their seeds (which in the case of dicots the cotyledons are two, hence the name). The cotyledons of the dicots may also emerge and show above the ground and function similar to leaves (i.e. perform photosynthesis).
Apart from the number of cotyledons, other identifying characteristics are as follows:

  • the number of flower parts – dicot flowers are tetramerous or pentamerous (in multiples of four or five)
  • the number of pores in pollen – dicots have three
  • arrangement of vascular bundles in the stem – in dicots, the vascular bundles are in concentric circles
  • secondary growth – dicot stems usually have secondary growth
  • the roots – dicot roots have taproot system
  • the arrangements of major leaf veins – in dicots, the leaves have reticulate venation

Word origin: From di- (“two”) + cotyledon (“embryonic leaf”).

Related forms: dicotyledonous (adjective)
Variant: dicot
Compare: monocotyledon


You will also like...

Cell Biology
Cell Biology

The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..

Photosynthesis and respiration
Plant Metabolism

Plants are responsible for incredible feats of molecular transformation. Plant processes, such as photosynthesis, photop..

Types and Causes of Brain Damage
Types and Causes of Brain Damage

This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

Homeostasis by water regulation
Homeostasis of Organism Water Regulation

Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the amount of water..

primitive arthropods
Arthropods

The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..

DNA molecule
Genetic Control – On and Off Genes

Genes are the blueprint of our bodies, a blueprint that creates a variety of proteins essential to any organism's surviv..