Class 7 Biology Reproduction in Plants Types Of asexual reproduction

Types Of asexual reproduction

Vegetative Propagation- When vegetative parts give rise to new plants, this type of reproduction is called as vegetative propagation.

  • If a branch of a plant is cut with a node and watered every day, roots and new leaves come out. Nodes are the parts of the stem or branch at which a leaf arises.
  • Flower buds and vegetative buds having short stems around which immature overlapping can give rise to a new plant. The buds which are present in the point of attachment of the leaf at the nodes are called vegetative buds.
  • Scars present in potato called as eyes can give rise to new organisms.

Fig. Eyes in potato  

  • Bryophyllum can give rise to new plant from the buds present in the margin of leaves.

Fig. Bryophyllum   

  • Sweet potato and dahlia can give rise to new plants from roots.

Fig. dahlia  

  • In cactus, new plants are produced when the parts of the plant get detached from the main plant body and each part can give rise to a new organism.

Fig. cactus  

Budding-

  •  In unicellular organisms small bulb like projections called buds come out from the body of organisms.
  • The bud grows like a chain and detaches from the parent body to form a new organism.
  •  The new detached cell grows and matures and becomes a new organism.

Fig. Budding  

 

Fragmentation-

  • The organisms break down into many fragments.
  • The fragments grow into a new organism.
  • Example -Spirogyra, a slimy green alga.

Fig. Fragmentation in spirogyra   

 

Spore formation-

  • Spores are special asexual reproductive structures covered by a hard protective coat.
  • Spores can withstand unfavorable conditions such as high temperature with the help of protective coat.
  • Spores can germinate under favorable conditions and can develop into a new individual.
  • Spores can float in the air and cover long distance.
  • Example- Moss and ferns.

Fig.  Mosses , ferns

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