Write down algorithm to swap two numbers.
Answers
Answer:
The different types of tissues we have
discussed until now are all made of one type
of cells, which look like each other. Such
tissues are called simple permanent tissue.
Yet another type of permanent tissue is
complex tissue. Complex tissues are made of
more than one type of cells. All these cells
coordinate to perform a common function.
Xylem and phloem are examples of such
complex tissues. They are both conducting
tissues and constitute a vascular bundle.
Vascular or conductive tissue is a distinctive
feature of the complex plants, one that has
made possible their survival in the terrestrial
environment. In Fig. 6.3 showing a section of
stem, can you see different types of cells in
the vascular bundle?
Xylem consists of tracheids, vessels,
xylem parenchyma (Fig. 6.7 a,b,c) and xylem
fibres. The cells have thick walls, and many
of them are dead cells. Tracheids and vessels
are tubular structures. This allows them to
transport water and minerals vertically. The
parenchyma stores food and helps in the
sideways conduction of water. Fibres are
mainly supportive in function.
Phloem is made up of four types of
elements: sieve tubes, companion cells,
phloem fibres and the phloem parenchyma
[Fig. 6.7 (d)]. Sieve tubes are tubular cells with
perforated walls. Phloem is unlike xylem in
that materials can move in both directions in
it. Phloem transports food from leaves to other
Cork cells Ruptured epidermis
Phloem
Fig. 6.6: Protective tissue
parts of the plant. Except for phloem fibres,
phloem cells are living cells.
Explanation:
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