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                              Q:
                           
                           
                                                      | A) Volvox | B) Penicillium | 
| C) Agaricus | D) Nostoc | 
                              Answer:   D) Nostoc
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Nostoc is a prokaryote. Prokaryotic cells lack membrane bound organelles and well organized nucleus, that is nuclear envelope is absent in these cells.

The nuclear envelope, also known as the nuclear membrane, a bilayer membranes which surrounds the nucleus, and in eukaryotic cells it encases the genetic material.
 
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