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Chapter 6 : Tissues
From the last chapter, we recall that all living organisms are made of cells. In unicellular organisms, a single cell performs all basic functions. For example, in Amoeba, a single cell carries out movement, intake of food and respiratory gases, respiration and excretion. But in multi-cellular organisms there are millions of cells.
6.1 Are Plants And Animals Made Of Same Types Of Tissues?
Let us compare their structure and functions.
Do plants and animals have the same
structure? Do they both perform similar
functions?
There are noticeable differences between
the two. Plants are stationary or fixed – they
don't move. Most of the tissues they have are
supportive, which provides them with
structural strength. Most of these tissues are
dead, since dead cells can provide mechanical
strength as easily as live ones, and need less
maintenance.
6.2 Plant Tissues
6.2.1 MERISTEMATIC TISSUE
Activity 6.1
1. Take two glass jars and fill them with
water.
2. Now, take two onion bulbs and place
one on each jar, as shown in
Fig. 6.1.
6.3 Animal Tissues
When we breathe we can actually feel the movement of our chest. How do these body parts move? For this we have specialised cells called muscle cells (Fig. 6.8). The contraction and relaxation of these cells result in movement.
