frog

Definition

A frog is a small, cold-blooded vertebrate animal that belongs to the order Anura. Frogs are characterised by their smooth, moist skin, their long back legs, and their ability to jump. They are found in a wide variety of habitats, including forests, swamps, and even deserts.

There are over 6,000 species of frogs, and they come in a wide variety of shapes and sizes. Some frogs are very small, while others can grow to be quite large. Some frogs are brightly coloured, while others are more drab.

Frogs are an important part of the ecosystem. They eat insects, which helps to control populations of pests. They are also food for other animals, such as birds and snakes.

Frogs reproduce by laying eggs in water. The eggs hatch into tadpoles, which have tails and gills. Tadpoles breathe underwater and eat algae. As they grow, they lose their tails and develop lungs. They then move onto land and become frogs.

The life cycle of a frog is an example of metamorphosis. Metamorphosis is a process of change in which an animal undergoes a dramatic transformation from one form to another.

How can the word be used?

The frog croaked loudly.

Different forms of the word

Noun: frog, frogs.

Adjective: froggy.

Verb: frog.

Etymology

The word "frog" comes from the Old English word frogga, which means "frog". The Old English word frogga is thought to be related to the Old Norse word frögg, which also means "frog".

Question

Where are you likely to find a frog?

AQA Science Exam Question and Answer

Question:

Describe the adaptations of frogs that enable them to thrive in both aquatic and terrestrial environments.

Answer:

Frogs, amphibians belonging to the Anura order, possess remarkable adaptations that facilitate their success in both aquatic and terrestrial habitats. Firstly, their unique moist, permeable skin aids in respiration through cutaneous gas exchange while keeping them hydrated, essential for survival in both environments. Secondly, their powerful hind legs are adapted for jumping, allowing quick escapes from predators on land and efficient swimming in water. Additionally, frogs have specialised eyes positioned on top of their heads, providing a panoramic field of vision, which is beneficial for detecting threats in both air and water. Furthermore, their webbed feet enhance swimming ability, while distinct toe pads allow them to cling to surfaces and climb. Lastly, a remarkable life cycle, including metamorphosis, allows frogs to transition from aquatic tadpoles to terrestrial adults, enabling the successful colonisation of diverse habitats. Overall, these adaptations maximise their ecological versatility, ensuring their survival in a range of environments.