It is essential for every living cell to get food and oxygen. The survival of the organisms depends upon the availability of energy which a cell obtains by the oxidation of food.
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Diffusion is an example of passive transport by which gases like carbon dioxide and oxygen and solutes in a solution get transported. Molecules move from where they are plentiful (higher concentration) to where they are less in amount (lower concentration).
Large organisms require a definite transport system. In most higher plants the transport system is made up to tube-like structures called xylem and phloem. These constitute a vascular system.
There are some obvious advantages that the modern means of transport have over the carts and carriages of olden days:- Modern means of transport are very fast. We can travel from one end of India to another in a few days by train and a few hours by aeroplane.
Fuels serve as a major part of our energy requirement. They are the concentrated store of energy, which is related as heat when fuels are burnt. Fuels are combustible substances of organic origin or artificially obtained substances, which are used for producing heat and energy. Wood, diesel, coal .domestic gas, petrol and biogas are some of the examples of fuels.
The development of fast means of transport has increased the trade not only within the country, but also between different countries of the world. It is now possible to buy goods produced in other parts of the country, and the world, from our local market.
Plants largely depend on the mineral nutrients present on soil for their metabolism Along with water minerals are taken up by plants. But absorption and translocation of minerals in from of solutes is independent of water up taking.