The economic importance of algae explained in the NCERT Solutions for Class 11 Biology Chapter 3 Plant Kingdom are: 

1. Green algae such as  Ulva, Caulerpa, Enteromorpha, Chlorella, etc, are used as food rich in lipids, protein, vitamins, minerals, etc.  

2.  Chlorella and Caulerpa are also used to obtain antibiotics.  

The economic importance of bryophytes given in the Plant Kingdom class 11 NCERT is: 

1. Sphagnum has the property to hold water for a long time and is also used as a bed to wrap around plant roots during transportation.

2.  Mosses take after lichens on rocks and continue the plant succession.