dandelion
Definition
A dandelion is a flowering plant that is known for its yellow flowers and fluffy seeds. It is a member of the Asteraceae family, which includes many other flowers, such as daisies, sunflowers, and chrysanthemums.
Dandelions are herbaceous plants, which means that they have soft, green stems and leaves. The leaves of dandelion are arranged in a basal rosette, which is a circular pattern at the base of the plant.
The flowers of dandelion are made up of many small florets that are arranged in a disc-like shape. The florets are yellow, and they are surrounded by a ring of green bracts.
The seeds of dandelion are attached to achenes, which are small, dry fruits. The achenes have parachute-like structures that help them to spread in the wind.
Dandelions are a common weed, but they are also a valuable food source for many animals. The leaves and flowers of a dandelion can be eaten, and the roots can be used to make tea.
How can the word be used?
The dandelions were in full bloom in the park, their bright yellow flowers a welcome sight after a long winter.
Different forms of the word
Noun: dandelion.
Adjective: dandelion.
Pronoun: dandelion.
Etymology
The word "dandelion" comes from the French word "dent-de-lion," which means "lion's tooth." The French word "dent-de-lion" is thought to be a reference to the shape of the dandelion's leaves.
The word "dandelion" was first used in English in the 15th century.
The word "dandelion" is related to the words "lion" and "tooth.".
The scientific name for dandelion is Taraxacum officinale.
Question
Where can you find dandelions?
AQA Science Exam Question and Answer
Question:
Dandelions are common weeds found in various environments. Describe the main mechanism by which dandelion seeds are dispersed, and explain the advantages of this method for the plant's survival.
Answer:
Dandelion seeds are dispersed through a method called "wind dispersal" or "aerodynamic dispersal." Once a dandelion flower matures and develops seeds, a fluffy, umbrella-like structure called a "pappus" forms at the top of each seed. This pappus acts as a parachute or wing, aiding in seed dispersal.
As the wind blows, it catches the pappus, carrying the dandelion seeds away from the parent plant. The seeds can travel considerable distances in this manner before eventually landing on the ground.
The advantages of wind dispersal for dandelions' survival are:
- Wide Distribution: Wind dispersal allows dandelion seeds to spread over large areas, increasing their chances of finding suitable growing conditions.
- Colonization of New Habitats: By reaching new areas, dandelions can colonize different habitats, ensuring their survival and adaptation to changing environments.
- Avoiding Competition: Wind dispersal enables dandelions to disperse their seeds away from the parent plant, reducing competition for resources and increasing the chances of seedling survival.
In summary, dandelion seeds are dispersed by wind, facilitated by the parachute-like structure called the pappus. This mechanism provides dandelions with a wide distribution range, colonization opportunities, and avoidance of competition, enhancing their chances of survival and successful reproduction.