Social Science STD 7 Chapter 12: Effects of Atmosphere on Living Beings - Exercises
1. Answer the following questions in one sentence:
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1. Upto how many kilometers does the Troposphere extend over the equator?
The Troposphere extends up to approximately 16 kilometers over the equator. -
2. Which trees are found in tropical evergreen forests?
Trees like rosewood, Ebony, and Mahogany are found in tropical evergreen forests. -
3. Which animals are more common in coniferous forests?
Animals such as monkeys, polar bears, musk deer, and yaks are common in coniferous forests. -
4. What kind of clothes do the people of the desert region wear? Why?
People in the desert region wrap a handkerchief of cloth around their heads to protect themselves from the constantly flying sand. -
5. What is the south-west wind called?
The south-west wind is a type of seasonal wind, also known as monsoon winds.
2. Write short notes:
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1. Temperate grass-land.
Temperate grasslands are found in the middle of continents and have a moderate climate. Short and nutritious grass grows in these regions. Animals like wild buffalo, bison, and antelope are found here. In Gujarat, this type of grass grows in the Velavadar area of Bhavnagar and the Banni area of Kuchchh. -
2. Forests of Mediterranean sea.
Mediterranean forests are found in regions near the Mediterranean Sea in Europe, Africa, and Asia. These regions have a hot and dry climate in the summer and a cold and moist climate in the winter. The plants here are adapted to dry summers, and citrus fruits like oranges, figs, olives, and grapes are commonly grown in these regions. -
3. Isotope cover.
The term "Isotope cover" is not mentioned in the provided text as a type of atmospheric layer or a concept related to the environment. The text discusses the four main atmospheric layers: Troposphere, Stratosphere, Mesosphere, and Thermosphere. -
4. Atmospheric pressure.
Atmospheric pressure is the weight of the layer of air that surrounds the Earth, which pushes down on the Earth's surface. The pressure is higher at the ocean surface and decreases as one moves to higher altitudes. Low-pressure areas are associated with hot temperatures where gases rise, leading to cloudy and humid weather, while high-pressure areas are associated with cool temperatures where the air is dense and sinks.
3. Answer the following questions:
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1. What is climate? State the effects of climate on human life.
Climate is the average weather condition of a region over a long period, typically 35 years or more. Climate directly affects various aspects of human life. It determines the types of food people eat, such as wheat in the plains and maize in hilly regions. It influences the clothes people wear, with warm, woolen clothes in cold climates (e.g., Ladakh) and light, cotton clothes in warm climates (e.g., South India). Climate also affects housing, with steeply sloping roofs in rainy regions and low-sloped roofs in dry regions. The work capacity and overall temperament of people can also be influenced by the climate of their region. -
2. Describe the tropical evergreen forest.
Tropical evergreen forests, also known as tropical rain forests, are dense forests found near the equator and in the tropics. They exist in hot and humid climates that receive heavy rainfall throughout the year. The trees in these forests do not shed their leaves at the same time, so they remain green all year. Common trees found here include rosewood, Ebony, and Mahogany. In India, these forests are found in the Andaman and Nicobar Islands.
4. Fill in the following blanks with the correct word:
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1. Reflection of radio-wave is attributed to ......... layer.
Ionosphere -
2. Pashmino-goat is found in .........
Kashmir -
3. Polar winds blowing from the poles towards polar circle are called .........
Polar winds