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CHAPTER 12�REPRODUCTION IN PLANTS

CLASS 7 SEEMA D K

SCIENCE TGT SCIENCE

JNV KOTTAYAM

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REPRODUCTION IN PLANTS

SEEMA D K

TGT SCIENCE

JNV KOTTAYAM

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Importance of Reproduction

  • produce new generation of individuals to replace those members that die
  • ensure continuation of the species

Production of new individuals of the same kind is called reproduction.

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Basic types of Reproduction

  • Asexual Reproduction
  • Sexual Reproduction

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Asexual Reproduction

  • produce offspring from a single parent without fusion of gametes
  • new organism exactly like its parent

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Vegetative Propagation

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Budding (e.g. Yeast)

Process:

1. Parent cell produces small outgrowth

2. Outgrowth detaches from parent cell

3. A new cell formed

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Sexual Reproduction

  • sex cells & gametes are produced
  • sometimes an organism can produce both male & female gametes
  • fertilization (male gamete + female gamete) takes place which produce a zygote

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Stigma

Style

Ovary/ Carpels

Ovule

Petal (petals = corolla)

Receptacle

Sepal (sepals = calyx)

Pistil (carpels = gynoecium)

Anther

Filament

Stamen (stamens = androecium)

Structure of a Flower

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Fertilization

  • fusion of male gamete & female gamete to form a zygote

Process

  • pollen grain lands on a stigma and then secretes sugary solution
  • stimulates the development of pollen tube which grows down the style & ovary
  • secretes enzyme to digest a pathway through style
  • liberates male gamete in ovary & fuse with egg cell

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Different forms of seeds

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