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Free summary · Grade 5 Natural Sciences

Life cycles

The stages from birth to adult in insects, frogs, birds, mammals and plants. Read one part at a time and tap “I know this”. Then test yourself in the quiz.

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Complete metamorphosis

EggLarva(caterpillar)PupaAdultbutterfly
Four stages, and then the cycle starts again.

The caterpillar does the most eating and growing. Inside the pupa it changes completely into a butterfly. A moth goes the same way: egg, caterpillar, cocoon, moth.

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Frogs, birds and mammals

EggsTadpole(gills)FrogletAdult frog
The tadpole grows legs, and its tail shrinks.
  • A chicken’s cycle starts with an egg that is incubated (kept warm) until it hatches.
  • Mammals, like a cat, have live young and feed them milk; there is no egg stage.
  • A dog’s life cycle: a puppy is born alive → drinks its mother’s milk and grows → young dog → adult dog that can have puppies of its own.
  • Mosquito larvae grow in standing water: empty containers to stop them.
The life cycle of a frog.
The life cycle of a frog.
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Plants and the next generation

The flower makes seeds after pollination. Seed dispersal gives new plants space and light. Many animals lay lots of eggs, because most young do not survive: predators, drought and habitat loss make life short. Each generation produces the next, and so the species keeps going.

Rule

A flowering plant’s life cycle: seed → germinates (needs water, air and warmth) → seedling → adult plant → flowers → pollination → fruit with seeds → seeds are dispersed → new plants.

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Parents care for their young

  • Many animals care for their young so that they can grow: birds feed their chicks, a cow gives her calf milk, and a lioness teaches her cubs to hunt.
  • A life cycle shows how one generation gives rise to the next, so that the kind keeps on existing.
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Remember this and test yourself

Remember this: your summary
  • A life cycle is the stages from birth to having young of its own.
  • Butterfly: egg → larva (caterpillar) → pupa → adult. The big change is called metamorphosis.
  • Frog: eggs → tadpole → froglet → frog; the tadpole first breathes with gills.
  • A grasshopper has no pupa: a nymph looks like a small adult and moults to grow.
  • Plant: seed → seedling → mature plant → flower and new seeds. A seed germinates with water, air and warmth.

Write these points in your book. Read them again the night before the test.

Memory trick

Butterfly: E-L-P-A: “Every Little Pupa Awakes.” (Egg, Larva, Pupa, Adult)

Flash cards · Tap to turn over

Important words

First say what the word means, then turn the card over.

Test yourself · Part 2

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