Class 8, Reproduction

Reproduction- Introduction

Reproduction: It is a biological process by which a new individual (offspring) is produced from pre-existing individuals (parents).

  • Reproduction is one the key life processes crucial to all living beings. It is of two types: Asexual and Sexual

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Asexual Reproduction:

  • Only a single individual is involved
  • Offsprings are formed by splitting of one parent (Uniparental)
  • Offsprings look very similar to their parents

Types of Asexual Reproduction:

  1. Fragmentation: Organism breaks into several pieces, each piece regenerates into a new organism. Example: Hydra and Flatworms
  2. Binary Fission: Organism splits into two equal halves. Nucleus divides first, followed by cytoplasm. Example: Amoeba, paramecium
  3. Multiple Fission: Organism develops a cyst around itself under unfavourable Nucleus divides several times mitotically. Nuclear division is followed by separation of cytoplasm, each nucleus give rise to a new individual. Example: Amoeba
  4. Budding: A small outgrowth develops from parent body, grows in size and eventually separates from parent into an independent organism. Example: Hydra
  5. Regeneration: Organism forms many of its own kind from cut pieces of the body. Example: Flatworms, Sponges and Hydra.


 

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