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  • 22 August 2018

    NCERT STD 7 SCIENCE UNIT 7 Weather Climate UNIT TEST PDF

    Weather Climate

    Weather:

    The day to day condition of atmosphere at a particular place is called weather. The weather can be comfortable, or can be too hot or cold.
    Weather Report: The daily report about weather; usually released by the meteorological department is called weather report. Weather report is often shown along with the news on television.
    Elements of Weather: The various elements of weather are: temperature, humidity, rainfall, wind-speed, etc.
    • Temperature: Temperature depends upon the duration of sunshine. During the summer season, the duration of the sunshine is longer. Due to this, the temperature is high in summer. The day temperature is minimum in the morning and maximum at noon.
    • Humidity: Humidity is the amount of moisture present in air. Humidity is generally measured in percentage. Humidity is generally at the highest level; during the rainy season.
    • Rainfall: Amount of rainfall is measured in terms of mm. For this, an apparatus; called rain gauge is used.
    • Wind-speed: Speed of wind also affects the condition of weather.



    Department of Meteorology: This is a Government Department. The Meteorological Department measures the elements of weather and keeps their record. Meteorologists use data from satellites and analyse the data to forecast about the weather.

    Climate:

    Climate is the average weather condition of at least 25 years; in a given geographical part.
    The climate of India is said to be hot and humid, because the temperature is usually high and so is the humidity for most parts of the year. The climate of Rajasthan is said to be hot and dry because temperature is very high but humidity is very low. On the other hand, the climate of Kashmir is said to be cold because temperature is low.
    Rainforest: Rainforest is found generally near the equator. Places near the equator receive more sunshine and hence more rainfall. This makes the place hot and humid. Temperatures vary from 15⁰C to 40⁰C near the equator. Rainforests are also present in some tropical areas.


    Desert: Temperature in desert is generally higher and it receives less or little rain fall. So deserts are hot and dry.
    Polar Region: Polar Region is at high latitude and hence do not receive adequate sunshine. Due to this, temperature is very low in the Polar Regions. The Polar Region is covered with snow, because of the low temperature.

    Climate and Adaptation:

    At several places, such as desert, polar region, etc. climate is very harsh. Many organisms live and thrive at these places, in spite of the harsh climate. Animals and plants; living in such places; develop certain features which help them survive the harsh climate. To develop certain features in order to survive the given climate is called adaptation.
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    By Nikunj Savani

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