Pls ans this fully

Dear Student, 

The tetrads are divided on the basis of arrangement of pollen grains in tetrad.
Tetrahydral tetrads: In this type, the four pollen grains form the points of tetrahedron i.e they are arranged in tetrahedron form. Also it is the most common form.
These are formed by successive  cytokinesis of meiosis.
Hence , correct option is option D. 
Regards

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