Chapter 7 of Class 11 Biology is Structural Organisation in Animals. It covers animal tissues and uses the earthworm as a representative example of organ-system level organization. These Class 11 Biology Chapter 7 solutions are also useful as quick revision notes before exams.
Animal Tissues
Four basic types: epithelial tissue (covering/lining, protection/secretion/absorption), connective tissue (binds/supports, e.g. blood, bone, cartilage, areolar), muscular tissue (movement, striated/unstriated/cardiac), and neural tissue (communication via neurons).
Epithelial Tissue
Classified by cell shape (squamous, cuboidal, columnar) and layers (simple=single layer, compound=multiple layers). Specialized types: ciliated (moves substances), glandular (secretion).
Connective Tissue
Cells embedded in an extracellular matrix. Types: loose (areolar, adipose), dense (tendons connect muscle to bone, ligaments connect bone to bone), skeletal (bone, cartilage), and fluid (blood).
Muscular Tissue
Striated (skeletal): voluntary, attached to bones. Unstriated (smooth): involuntary, in internal organs. Cardiac: involuntary, striated, found only in the heart, branched cells with intercalated discs.
Neural Tissue
Composed of highly specialized cells called neurons, capable of receiving and transmitting electrochemical signals throughout the body.
Earthworm: Organ-System Organization
Represents the highest level of organization — organs work together as coordinated organ systems (digestive, circulatory, nervous, reproductive systems, etc.) for the smooth functioning of the whole organism.
Class 11 Biology Chapter 7 – Notes and Extra Questions
Along with these NCERT Solutions, students can also use the Class 11 Biology Chapter 7 Extra Questions and Class 11 Biology Chapter 7 Revision Notes for quick revision and extra practice.
