1. Define the following.
(a) Cell
(C) Multicellular organism
(e) Organ
(b) Unicellular organism
(d) Tissue
(f) Organ system
Answers
Answer:
basic and structural unit of life is called cell
a.cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter and compose all living things. Most cells have one or more nuclei and other organelles that carry out a variety of tasks
c.Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms. ... Multicellular organisms arise in various ways, for example by cell division or by aggregation of many single cells.
e.An organ is a self-contained group of tissues that performs a specific function in the body. The heart, liver, and stomach are examples of organs in humans. The word organ comes from the Latin organum, which means “instrument”. Organs are found in most animals and plants. ...
b.A unicellular organism, also known as a single-celled organism, is an organism that consists of a single cell, unlike a multicellular organism that consists of multiple cells. ... In contrast, even the simplest multicellular organisms have cells that depend on each other to survive.
d.Tissues are groups of cells that have a similar structure and act together to perform a specific function. The word tissue comes from a form of an old French verb meaning “to weave”. ... Groups of tissues make up organs in the body such as the brain and heart
f.An organ system is a group of organs that work together as a biological system to perform one or more functions. Each organ does a particular job in the body, and is made up of distinct tissues.