Thursday, 4 April 2013
Sample:-
Question 1:
What is a
tissue?
Tissue is a group of cells that are similar in structure and are
organised together to perform a specific task.
Question 2:
What is the
utility of tissues in multi-cellular organisms?
In unicellular organisms, a single cell performs all the basic functions
such as respiration, movement, excretion, digestion, etc. But in multicellular
organisms, cells are grouped to form tissues. These tissues are specialised to
carry out a particular function at a definite place in the body. For example,
the muscle cells form muscular tissues which helps in movement, nerve cells
form the nervous tissue which helps in transmission of messages. This is known
as division of labour in multicellular organisms. It is because of this
division of labour that multicellular organisms are able to perform all
functions efficiently.
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