Monocotyledon

Monocotyledon or monocot is a type of flowering plant. The term "monocotyledon" is derived from the single (mono) seed leaf (cotyledon) present in the seeds of these plants. Monocots are one of the two major groups of flowering plants, or angiosperms, the other being the dicotyledons.

Characteristics

Monocots have several distinguishing characteristics. They typically have one cotyledon, or seed leaf, in their seeds. The leaf veins in most monocots are usually parallel. The flower parts of monocots usually come in multiples of three. The primary root, or radicle, of monocots usually dies off and is replaced by adventitious roots.

Classification

Monocots are classified under the class Liliopsida in the Angiosperm Phylogeny Group system. They are further divided into several orders, including the Asparagales, Liliales, and Poales, among others.

Diversity

There are about 60,000 species of monocots, making up around 25% of all flowering plants. They are found in a wide range of habitats, from deserts to aquatic environments. Some well-known monocots include grasses, lilies, orchids, and palms.

Economic Importance

Many monocots are of great economic importance. For example, rice, wheat, and corn are monocots and are some of the most important food crops in the world. Other economically important monocots include sugar cane, banana, onion, garlic, and bamboo.

Evolution

The monocots are believed to have evolved around 140-200 million years ago. They are thought to have evolved from the dicotyledons, with the main difference being the number of cotyledons in the seed.

See Also

• Dicotyledon
• Flowering plant
• Seed

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