حیاتی دورانیے
Biology · Key Stage 2 · The School
Different routes to grown up
A MAMMAL is born looking like a small version of its parent and simply grows. An AMPHIBIAN like a frog changes completely: egg, tadpole with gills, then legs, then lungs. An INSECT like a butterfly changes even more dramatically — egg, caterpillar, pupa, adult. That complete rebuild is called METAMORPHOSIS.
How a flower makes a seed
POLLINATION is pollen moving from the anther of one flower to the stigma of another, usually carried by an insect or the wind. FERTILISATION happens when the pollen joins with the ovule. The fertilised ovule becomes a SEED and the surrounding part often becomes a fruit — which is the plant paying an animal, in food, to carry its seeds away.
Why a caterpillar and a butterfly eat different things
It is not an accident. A caterpillar eats leaves and does nothing but grow; a butterfly drinks nectar and does nothing but breed and travel. Splitting the two jobs between two body plans means they never compete with each other for food, even though they are the same animal.
MAMMAL (dog): puppy → adult dog. It grows bigger and does not change shape. INSECT (butterfly): egg → caterpillar → chrysalis → butterfly, and inside the chrysalis most of the caterpillar is dissolved and rebuilt. AMPHIBIAN (frog): egg → tadpole with gills and a tail → legs grow, tail and gills go → frog that breathes air. Draw all three on one page and the differences are unmissable.