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Differentiate between Exine and Intine layers of pollen grain.

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Exine: 

1. Thick outer layers

2. It is made of cellulose, sporopollenin and pollenkitt. 

3. Ununiform layer

Intine: 

1. Thin inner layer 

2. It is made up of pectin, hemicellulose, cellulose and callose 

3. Uniform layer

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