ICSE Class 7 Biology — Flashcards for Quick Revision

A: A tissue is a group of cells that are similar in structure and perform a specific function. For example, skin cells form a protective tissue, and muscle cells form muscle tissue.

A: Multicellular organisms need tissues because many similar cells working together can do a job more efficiently than single cells alone. Tissues help in forming organs and organ systems.

A: Meristematic tissues are plant tissues made up of actively dividing cells. Their only function is to produce more cells, which helps the plant grow.

A: Classification is the system of grouping living organisms into groups based on similarities and differences. It makes the study of living things easier and more systematic.

A: There are so many living organisms that they cannot be studied one by one easily. Classification helps by grouping similar organisms together, so their common features can be understood more quickly.

A: Classification helps in understanding the characteristics of a group, makes study systematic, helps in identifying organisms, and gives an idea about evolution from simpler to more complex forms.

A: Animals are classified into invertebrates and vertebrates. Invertebrates do not have a backbone, while vertebrates have a backbone or vertebral column.

A: Animals are heterotrophic because they cannot prepare their own food. They depend on plants or other animals for nutrition.

A: Locomotion is movement from one place to another, usually in search of food or shelter.