TRANSPORTATION IN PLANTS AND CIRCULATION IN ANIMALS
Multicellular organisms
possess millions of cells in their body. Every cell needs a constant supply of
essential substances like nutrients and oxygen to maintain life and survival.
Food is the only source of energy and every cell gets its energy by the
breakdown of glucose. The cells utilise this energy and govern various vital
activities of life.
Have you ever wondered
how water and nutrients absorbed by the root are transported to the leaves? How
is the food prepared by the leaves carried to the other parts of the plant? Do
you know how water reaches the top of tall plants inspite of not having a
circulatory system like animals? Water absorbed by the roots have to reach
entire plant and the food synthesised by the leaves have to be distributed to
all the parts of the plant. To understand this we need to recall the anatomy of
the plants. Water and mineral salts absorbed by the roots reach all parts of
the plant through the xylem. The food synthesised by the leaves are
translocated to all parts of the plant through the phloem. The bulk movement of
substances through the vascular tissue is called Translocation.
‘Transport’ means to
carry things from one place to another. Have you ever wondered how in animals
the useful substances are transported to other cells and toxic substances are
removed? In larger organisms transport of nutrients, salts, oxygen, hormones
and waste products around the body are performed by the ‘Circulatory system’.
The circulatory system consists of the circulating fluids, the blood
and lymph and the heart and blood vessels which form
the collecting and transporting system.
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