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Life Cycle of Protist

1) Life cycle showing zygotic meiosis

When Protist is haploid and meiosis occurs in zygote then it is known as zygotic meiosis.

In this type of life cycle during sexual reproduction gametes are formed by mitosis. These gametes are haploid. These gametes fuse to form a diploid zygote. After that meiosis takes place in zygote, as a result: haploid cells are formed again.

Note: In this type of life cycle the zygotic phase is only diploid and remaining all the phases is haploid so this type of life cycle is known as haplontic life cycle.

Image showing life cycle with zygotic meiosis.

Image Showing Life Cycle… (136 more words) …

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Staining of Bacteria

Gram staining technique:

  1. First of all H. C. Gram differentiated bacteria on the basis of staining.

  2. In the first step of this method bacteria are stained with Crystal Violet and then KI solution.

  3. After staining, bacteria are washed with Acetone or Ethyl alcohol. After washing some bacteria retain the stain and some bacteria are decolorized.

  4. Bacteria which retain stain (violet or purple) are called Gram (+) and bacteria which decolorize are known as Gram (-). Gram (-) bacteria are counter stained by safranin.

Image showing gram staining technique.

Image Showing Gram Staining Technique.

A Gram positive bacterium is in purple colour while a gram… (6 more words) …

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