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Metaphase I	Metaphase
1. Tetrads are arranged at equator. 2. Two equatorial plates are formed by centromeres.	1.Chromosomes are arranged at centre. 2. One equatorial plate is formed by centromeres.

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Chiasmata is the X-shaped structure formed due to the point of contact between paired chromatids during meiosis. It is the point representing the crossover where the homologous chromosomes are joined to each other.  

Significance.-  At chiasmata crossing over occurs in pachytene stage. The crossing over brings variations which are raw material of evolution.

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The two chromosomes are not seperated during Meiosis I. The cells are diploid, therefore in order to distribute the chromosomes eqully among the daughter cells so that they contain half the chromosome , Meiosis II is necessary. 

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Meiosis is the reduction division which  reduces the number of chromosomes to half in gametes formed in sex organs. Thus it is necessary for attaining haploid number of chromosomes in gametes. These gametes then fuse and restore the chromosome number in the organisms. Thus, meiosis is necessary for the maintenance of chromosome number.

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There are two distinct type of cell divisions taking place in multicellular organisms. One is mitosis in somatic cells for growth and healing of wounds and the other is meiosis in reproductive cells for producing gametes having half the number of chromosomes in order to maintain the number of chromosomes in the organism. It is essential to maintain the characters of the species. Therefore both type of cell division are necessary for an organism.