CBSE Notes for Class 7 Science Chapter 7 – Weather, Climate and Adaption of Animal to Climate

Important Notes for CBSE Class 7 Science Chapter 7 – Weather, Climate and Adaption of Animal to Climate. Weather, Climate and Adaption of Animal to Climate Class 7 Notes and Study Material Download in PDF form.

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Weather, Climate and Adaption of Animal to Climate Class 7 Notes

Weather, climatic conditions have an effect on our day-to-day life.

Weather report:

  • It is a report prepared by the Meteorological Department of the Government by collecting information on temperature, wind, etc.
  • The report consists on temperature, humidity and rainfallduring the past 24 hours.
  • Humidity: it is a measure of the moisture in air.
  • Rain gauge: It is a cylindrical instrument with a funnel to collect rainwater, to measure amount of rainfall.
  • The temperature, rainfall, humidity is constantly changing from days to weeks.
  • Weather: it is a state of atmosphere at a given place with respect to thetemperature, humidity, rainfall, wind speed etc.
  • The weather reports record the maximum and minimum temperature every day using the maximum and minimum thermometer.
  • The maximum temperature can be recorded in the afternoon and minimum temperature is usually recorded early morning
  • Changes in the weather are caused by the sun as it is the primary sourceof energy to all leaving creatures.
  • In winters the nights are longer and days are shorter in winter.

CLIMATE:

  • Weather patterns are recorded for years to determine climatic condition or changes at a particular place.
  • The average weather pattern recorded for a long period is called the climate.

CLIMATE AND ADAPTATION:

  • Change in climate lead to adaption in animal and results in evolution.
  • Climate also has an effect on the soil.
  • The polar region has is located near the north and south pole whereas the tropical rainforest is located near the equator.

(i) The polar regions:

  • The poles have extremely cold climate throughout the year and is snow clad at most of the time in the year.
  • In winters, the temperature can drop down to below –37°C.
  • Animals living in poles haveadapted to these extreme conditions.
  • Polar bears have white fur to comflage with snow. It is helps them in catching preys as well as protests them from predators.
  • The 2 layers of fur and fat under the skin also protects them from extreme cold climate.
  • On a warm day, physical activity can lead to overheating in polar bears. The temperature can be brought down by swimming in water.
  • The paws are modified to be wide and largewhich helps to swim and walk in snow.
  • They have well developed sense of smell which help them catch its prey
  • Penguin is also awhite animal which gets a benefit of the snow to hide from the predators.
  • Penguins also have a thick skin to protect them from cold climate.
  • Penguins have streamlined body and webbed feet to swim.
  • The birds cannot tolerate this cold climate so they migrate to warmer region.
  • The migratory birds travel a long distance and use landmarks, earths magnetic field to judge the direction of travel.
  • Many fishes and insects also migrate in different season.

(ii) The tropical rainforests:

  • these forests are located near the equator due to this reason the climate in these forests is generally quite hot even during the colder months.
  • In summers the temperature can get higher than 40°C, at the same time there is good rainfall in these areas.
  • The length of day and night is almost same throughout the year.
  • In India these forests are found in Western Ghats and Assam, whereas this forest is also found in Southeast Asia, Central America andCentral Africa.
  • Large Diversity of flora and fauna is found in the rain forest. There is competition for food and shelter
  • Animals are well adapted for living on trees e.g., Red-eyed frog has adapted sticky pads on feet which aid in climbing trees.
  • The monkeys have adapted log tails to maintain balance on trees.
  • Toucan is a bird which have a modified beak which is long, large beak which helps the bird to feed on fruits.
  • Other adaptions include sensitive hearing and thick skin in animals like lions and tigers, sharp eyesight, anda skin color which helps them to camouflage by blending with the surroundings.

Elephants:

  1. Elephants have adapted to Indian tropical rainforest.
  2. The trunk is used as a nose and has sense of smell and collecting food.
  3. The tusks are modified teeth which help them in feeding on tree barks.
  4. The large ears are of the elephant helps it hear even minimal sounds in the surroundings.
  5. The rainforest has a hot and humid climate
  6. The large ears help in maintaing the body temperature.

Weather, Climate and Adaption of Animal to Climate Class 7 Notes PDF

Weather, Climate and Adaption of Animal to Climate
Updated: October 29, 2021 — 11:59 pm

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