91 and 94 

91. Diversification in plant life appeared 
(A) Due to long period of evolutionary changes 
(B) Due to abrupt mutations 
(C) Suddenly on earth 
(D) By seed dispersal. 

94. Common indicator organism of water pollution is 
(A) Lemna paucicostata 
(B) Eichhornia crassipes 
(C) Escherichia coli 
(D) Entamoeba histolytica. 

Dear student,                     
​Please find below the solution to the asked query  
   

​91. Diversification in plant life appeared by seed dispersal.
Seed dispersal is a phenomenon of seed transport or movement  of seeds away from the parent plant. It helps in distribution and growth of immobile plants to new places. It has helped in evolution and diversification of plants.
Hence, option (D) is correct.

94. Common indicator organism of water pollution is Escherichia coli. It indicates the contamination done by faeces. Hence, option (C) is correct.
 
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