metamorphosis
Definition
Metamorphosis is a process of transformation that some animals undergo during their life cycle. It is a dramatic change in physical form, involving the destruction of the old body and the formation of a new one.
There are two main types of metamorphosis: complete metamorphosis and incomplete metamorphosis.
In complete metamorphosis, the animal undergoes a radical transformation. The young form, called a larva, is very different from the adult form. The larva undergoes a series of moults, or shedding of its skin, before it becomes an adult. Examples of animals with complete metamorphosis include butterflies, moths, and beetles.
In incomplete metamorphosis, the young form, called a nymph, is similar to the adult form. The nymph grows by moulting its skin several times before it becomes an adult. Examples of animals with incomplete metamorphosis include grasshoppers, cockroaches, and dragonflies.
Metamorphosis is a complex process that is not fully understood. However, it is thought to be triggered by hormones. Hormones are chemicals that are produced by the animal's body and that regulate its growth and development.
Metamorphosis is an important part of the life cycle of many animals. It allows them to change into a form that is better suited to their environment.
How can the word be used?
The frog's metamorphosis from a tadpole to a frog is a fascinating example of how animals can change their form.
Different forms of the word
Noun: A complete change of form or structure, especially one that is dramatic and seemingly magical.
Adjective: Relating to or characterised by metamorphosis.
Verb: To undergo metamorphosis.
Etymology
The word "metamorphosis" comes from the Greek words "meta" (change) and "morphē" (form). The word "metamorphosis" was first used in English in the 14th century.
The literal meaning of the word "metamorphosis" is "change of form". This is because metamorphosis is the process by which an animal or insect changes its form from one stage of its life to another.
Question
What is metamorphosis?
AQA Science Exam Question and Answer
Question:
Define metamorphosis and explain its significance in the life cycle of certain organisms. Provide examples of animals that undergo metamorphosis and describe the stages they go through during this process.
Answer:
Metamorphosis is a biological process involving significant structural and physiological changes in an organism's body as it progresses through distinct life stages. This phenomenon is particularly common in insects and amphibians, playing a crucial role in their life cycles.
An example of complete metamorphosis is seen in butterflies and moths. They undergo four distinct stages: egg, larva (caterpillar), pupa (chrysalis), and adult (butterfly or moth). The larval stage involves intense feeding to support growth. Subsequently, the pupal stage is characterised by the transformation of the caterpillar into an entirely different form within a protective casing. The adult emerges from the pupa with fully developed wings and reproductive structures.
Partial metamorphosis is exemplified by grasshoppers and crickets. They go through three stages: egg, nymph, and adult. The nymph stage resembles a miniature version of the adult but lacks fully developed wings. As the nymph moults and grows, it gradually develops adult features.
Metamorphosis is significant as it allows organisms to exploit different ecological niches at different life stages. It reduces competition for resources between different life stages and can enhance survival in diverse environments.