List the changes that a tadpole undergoes to develop into a frog in points..
Answers
1. Tadpole: Tadpoles live completely underwater. A hormone in the tadpole’s thyroid gland initiates metamorphosis.
2. Tadpole with hind legs : Over about a 24 hour period, the tadpole develops into a frog. This means almost every organ has to change so the tadpole can go from living underwater to living on land as an adult frog.
3.Tadpole with front and hind legs : After the hind legs have started to form, a pair of front legs will begin to develop and the tail will start to disappear. You might also notice that the tadpole has started to form a frog-like face. The tadpole’s skull is made out of cartilage (the same stuff your nose and ears are made out of) but during metamorphosis, the cartilage is replaced with bone.
4. Froglet: When the tadpole reaches the froglet stage, it is almost a full adult. At this point, the tadpole’s gills have disappeared, and its lungs have enlarged. This means it is ready to leave the water and live on land. Once its tail disappears, it will become an adult frog.
5. Adult Frog: This is a fully grown frog. The tadpole’s large intestine, important for digesting algae and plants, shrinks to suit the frog’s meat-eating diet.