 
  
There are total 19 chapters in Class 11 Biology as per the rationalized Syllabus. All the chapters are required for assessment
Couple of book 
(a)NCERT Class 11 Biology textbook
(b)NCERT Class 11 Exemplar
(c)Biology book by Pradeep S
It is sufficient if you go through all the questions in the NCERT text book thoroughly and practice them all.However to enhance your Biology skill , you can go for NCERT exemplar and other books  
First go through all the Notes and solved examples and Then do the exercises. Practice Lot of questions. The simple Mantra is Practice .Practice and Practice 
Chapter The living world
tools for study of taxonomy museums, zoological parks, herbaria, botanical gardens.
Chapter Plant Kingdom
Topics excluded – Angiosperms, Plant Life Cycle and Alternation of Generations.
Chapter : Morphology of Flowering Plants 
Modifications of different parts of flowering plants: root, stem, leaf,inflorescence, flower, fruit and seed 
Chapter : Structural Organisation in Animals
Morphology, anatomy and functions of different systems of an insect (cockroach) is replaced by Morphology, anatomy and functions of different systems of a frog
Chapter : Biomolecules
Nature of Bond Linking Monomers in a Polymer,Dynamic State of Body Constituents—Concept of Metabolism,Metabolic Basis for Living 
Chapter : Transport in Plants 
Full chapter
Chapter : Mineral Nutrition 
Full chapter
Chapter : Plant - Growth and Development 
seed dormancy; vernalisation; photoperiodism.
Chapter : Digestion and Absorption
Full chapter
Chapter : Neural Control and Coordination
reflex action; sensory perception;sense organs; elementary structure and functions of eye and ear