1.
How are simple tissues
different from complex tissues in plants?
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Simple tissue
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Complex tissue
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These tissues consist
of only one type of cells.
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These tissues are made
up of more than one type of cells.
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The cells are more or
less similar in structure and perform similar functions.
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Different types of
cells perform different functions. For example, in the xylem tissue,
tracheids help in water transport, whereas parenchyma stores food.
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Three types of simple
tissues in plants are parenchyma, collenchyma, and sclerenchyma.
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Two types of complex permanent
tissues in plants are xylem and phloem.
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2.
Differentiate between
parenchyma, collenchyma and sclerenchyma, on the basis of their cell wall.
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Parenchyma
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Collenchyma
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Sclerenchyma
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Cell walls are
relatively thin, and the cells in parenchyma tissues are loosely packed.
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The cell wall is
irregularly thickened at the corners, and there is very little space between
the cells.
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The cell walls are
uniformly thickened, and there are no intercellular spaces.
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The cell wall in this
tissue is made up of cellulose.
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Pectin and
hemicellulose are the major constituents of the cell wall.
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An additional layer of
the cell wall composed mainly of lignin is found.
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3.
What are the functions of
the stomata?
Functions of the stomata:
(i) They allow the exchange of
gases (CO2 and O2) with the atmosphere.
(ii) Evaporation of water from the
leaf surface occurs through the stomata. Thus, the stomata help in the process
of transpiration.
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