Life Cycles of Living Beings

📚 Key Concepts

🔹 What is a Life Cycle?

A life cycle is the series of changes that a living being goes through from birth to death, including reproduction to continue the species.

🔹 Life Cycle of a Plant

Plants follow this general pattern:

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Stage 1: Seed

  • Contains embryo (baby plant) and stored food
  • Remains dormant until conditions are right

Stage 2: Germination

  • Root emerges first, then shoot
  • Uses stored food in seed

Stage 3: Seedling

  • Young plant with first leaves
  • Starts making its own food

Stage 4: Adult Plant

  • Fully grown with many leaves
  • Produces flowers

Stage 5: Flowering and Reproduction

  • Flowers develop into fruits
  • Fruits contain new seeds

Stage 6: Death

  • Plant completes life cycle
  • New seeds continue the cycle

🔹 Life Cycle of a Mosquito

Mosquitoes undergo complete metamorphosis with four distinct stages:

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Stage 1: Egg

  • Laid in or near water
  • Small, oval-shaped

Stage 2: Larva

  • Worm-like, lives in water
  • Feeds and grows, molting several times
  • Breathes air from water surface

Stage 3: Pupa

  • Resting stage, does not feed
  • Major body changes occur inside
  • Still lives in water, breathes from surface

Stage 4: Adult Mosquito

  • Emerges from water
  • Can fly and reproduce
  • Lives on land, feeds on nectar or blood

Important: This is why we should prevent stagnant water – it stops mosquito breeding!

🔹 Life Cycle of a Frog

Frogs also undergo metamorphosis but with different stages:

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Stage 1: Egg (Spawn)

  • Laid in water as jelly-like clusters
  • Transparent with visible embryo

Stage 2: Tadpole

  • Lives in water like a fish
  • Has tail for swimming, gills for breathing
  • Feeds on algae and plant matter

Stage 3: Froglet

  • Develops legs, begins to lose tail
  • Starts to breathe with lungs
  • Can live both in water and on land

Stage 4: Adult Frog

  • No tail, strong legs for jumping
  • Lives both on land and in water
  • Breathes with lungs, eats insects

Amazing Fact: Tadpoles are completely different from adult frogs – they live in water, have tails, and eat plants, while adult frogs live on land, have legs, and eat insects!