Unseen Comprehension-40 Alim (Equator Or Outline)
Equator Or Outline.
নিরক্ষরেখা বা বিষুবরেখা।
The Equator is an imaginary line round the middle of the earth. It divides the earth into two equal parts approximately. The areas close to the equator are warmer than those that are farther away.
The coldest regions in the world are the polar regions near the North and South poles. They have an arctic climate. The hottest regions are in South Asia, North Africa and Central America. They are in tropics and their climate is tropical. The countries between the polar and tropical regions have a temperate climate. This climate prevails in Europe. The average temperature there is warmer than that of the poles and cooler than that of the tropics.
The plant growth in a particular region is called its vegetation. The vegetation of an area depends on its climate. In wet tropical regions, for instance, jungles are the commonest vegetation. In these jungles the tops of the trees are large and meet over head. There are smaller trees under that. The forests in the temperate regions are different. They don't have the thick undergrowth that is found in the tropical jungles. These forests are, therefore, more open than the tropical jungles. The deserts are the driest areas. They have very little vegetation at all. The regions farthest north and south of the equator are regions with ice, snow and frost all the year round. Here, too, there is little or on vegetation Man's most important interest in vegetation arises from his necessity of food. Different kinds of crops are grown in different climates. Crops such as rice and maize need more water than crops like wheat and rye. Rice must have a warm, moist climate during the growing season. Wheat, oats, rye and barley are called small grain'. They don't need so much water as rice and maize do. Wheat is the most widely grown small grain. It is perhaps the most important edible crop of all. The most important inedible crop grown by man is cotton. Man grows many kinds of crops. With the scientific knowledge of farming that he possesses nowadays he can grow some kinds of crops even in climates where formerly they could not be grown. Men cannot change climate but he can make the most of it.
The plant growth in a particular region is called its vegetation. The vegetation of an area depends on its climate. In wet tropical regions, for instance, jungles are the commonest vegetation. In these jungles the tops of the trees are large and meet over head. There are smaller trees under that. The forests in the temperate regions are different. They don't have the thick undergrowth that is found in the tropical jungles. These forests are, therefore, more open than the tropical jungles. The deserts are the driest areas. They have very little vegetation at all. The regions farthest north and south of the equator are regions with ice, snow and frost all the year round. Here, too, there is little or on vegetation Man's most important interest in vegetation arises from his necessity of food. Different kinds of crops are grown in different climates. Crops such as rice and maize need more water than crops like wheat and rye. Rice must have a warm, moist climate during the growing season. Wheat, oats, rye and barley are called small grain'. They don't need so much water as rice and maize do. Wheat is the most widely grown small grain. It is perhaps the most important edible crop of all. The most important inedible crop grown by man is cotton. Man grows many kinds of crops. With the scientific knowledge of farming that he possesses nowadays he can grow some kinds of crops even in climates where formerly they could not be grown. Men cannot change climate but he can make the most of it.
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