Difference Between Monocots And Dicots

This article discusses the differences between these monocots and dicots .

Kingdom Plantae consists of five major phyla: Bryophyta (mosses), Hepaticophyta (liverworts), Pterophyta (ferns), Coniferophyta (conifers), and Anthophyta (flowering plants). All plants are multicellular, eukaryotic, photoautotrophs. They contain cellulose in the cell walls to prevent water loss. Cells are specialized into tissues, which are specialized into organs. Plants also have stomata for gas exchange.

Flowering plants belong to the phylum Anthophyta. This phylum consists of only vascular plants. This means that they have a xylem and phloem. The xylem transports water and minerals; the phloem transports dissolved inorganic molecules. They uses both biotic and abiotic methods as a vector. Biotic means that they use water and wind to help fertilize seeds, while abiotic means that animals and insects help to fertilize the seeds. Angiosperms (in other words, flowering plants with seeds) also are sporophyte dominant.

Phylum Anthophyta is divided into two classes, the monocots (class Monocotyledones) and dicots (class Dicotyledones). Monocots include palms, grasses, orchids, irises, onions, and lilies. The dicot class includes oaks, roses, mustards, cacti, blueberries, and sunflowers. Dicots are more diverse and include many more species (at least 170,000) than the monocots (at least 65,000).



The cladistic analysis of recent molecular evidence suggests that the dicots are not a monophyletic group but instead are paraphyletic. Paraphyletic group contains a common ancestor in some, but not all, of its descendants. According to molecular evidence such as DNA sequence comparisons, some dicots- the magnolias and laurels- are more closely related to the monocots than to other dicots. Despite these data, botanists currently keep the classes Monocotyledones and Dicotyledones for convenience.

Monocots are mostly herbaceous plants with long, narrow leaves that have parallel veins (the main leaf veins run parallel to one another). The flower parts of monocot flowers usually occur in threes or multiples of three. For example, a flower might have three sepals, three petals, six stamens, and a compound pistil consisting of three fused carpels. Monocot seeds have a single cotyledon, or embryonic seed leaf, and endosperm, nutritive tissue, is usually present in the mature seed. In monocots, the vascular bundles in the stem cross section are usually scattered or more complex of an arrangement as compared to dicots. The roots are a fibrous root system.

Dicots may be herbaceous (for example, a tomato plant) or woody (for example, a hickory tree). Their leaves vary in shape but usually are broader than monocot leaves, with netted veins (branched veins resembling a net). Flower parts usually occur in fours or fives or multiples thereof. Two cotyledons are present in dicot seeds, and endosperm is usually absent in the mature seed, having been absorbed by the two cotyledons. The vascular bundles in the stem cross section of dicots is arranged in a circle, or ring. The roots are a taproot system.

Plants have important economic and nutritive purposes. They produce oxygen and the roots stabilize the soil for other plants. They are also a source of food and antibiotics. Finally, these flowering plants have provided centuries of getting guys off the hook when they mess up.... perfect for persuading a female for forgiveness.

© High Speed Ventures 2011