Class 7 Science Chapter 7 Important Questions
Class 7 Science Chapter 7 Important Questions and Keywords of Weather, Climate and Adaptations of Animals of Climate for session 2021-2022. Class 7 Science extra question answers of chapter 7 are important for school’s unit test and terminal exams.These are also helpful in clearing the doubts related to chapter 7 of standard 7 science. All the topics are covered through these important questions.
Class 7 Science Chapter 7 Important Questions 2021-22
|Chapter: 7||Weather, Climate and Adaptations of Animals of Climate|
|Contents:||Important Extra Questions with Answers|
Class 7 Science Chapter 7 Important Questions Set – 1
What is weather and it elements?
The day-to-day condition of the atmosphere at a place and the time with respect to the temperature, pressure, humidity, wind speed and wind direction, sunshine, clouds, rainfall, snowfall etc., is called weather at that place at that time.
The various factors which decide whether at a place are called “elements of weather”. The major elements of weather at a place are temperature, pressure, humidity, wind speed and wind direction, sunshine, clouds and rainfall, snowfall.
How does the weather change? Discuss.
The weather of a place changes day after day and week after week. That is why we often say, “today’s weather is too humid”, or “the weather was warm last week”. The weather is such a complex phenomenon that it can vary over very short periods of time. It can happen sometimes that it is sunny in the morning, but suddenly clouds appear from nowhere and it starts raining heavily. Or, a heavy rain may vanish in a matter of minutes and give way to bright sunshine.
What is “maximum and minimum thermometer”?
Any weather report, the maximum and minimum temperatures are recorded every day. There are special thermometers for this purpose, called maximum and minimum thermometers. The maximum temperature of the day occurs generally in the afternoon while the minimum temperature occurs generally in the early morning.
“Days are shorter in winter, than in summer”. – Why?
The line of the equator and it divides our planet into two halves; the Northern Hemisphere and the Southern Hemisphere.
On maps and globes, the Earth looks straight up and down, with the North Pole at the top and the South Pole at the bottom. Actually, though, the Earth is tilted 23.4 degrees. This tilt is the reason that days are longer in the summer and shorter in the winter. The hemisphere that’s tilted closest to the Sun has the longest, brightest days because it gets more direct light from the Sun’s rays.
What is climate?
Meteorologists record the weather every day. The records of the weather have been preserved for the past several decades. These help us to determine the weather pattern at a place. “The average weather pattern taken over a long time, say 25 years, is called the climate of the place”. If we find that the temperature at a place is high most of the time, then we say that the climate of that place is hot. If there is also heavy rainfall on most of the days in the same place, then we can say that the climate of that place is hot and wet.
Class 7 Science Chapter 7 Important Questions Set – 2
“The climate in tropical region is very hot whereas that in polar region is extremely cold”. Why?
Every place on the earth has its own climate. Our climate depends on our position on the earth and our distance from the sun. The climate is different at different places around the world because there are not heated equally by the sun. The equator of earth is at the minimum distance from the sun. The regions around the equator of earth called “tropical regions”, where the sun shines directly over-head and get the maximum heat from the sun and have a very hot climate.
As a region gets more and more away from the equator towards the poles, the amount of sun’s heat received by the region goes on decreasing, leading to gradually cooler climates. The poles of the earth are at the maximum distances from the sun. Due to this, the sun’s rays have to travel much more to reach the polar regions of earth which makes them lose much of their heat. So, the climate in tropical region is very hot whereas that in polar region is extremely cold.
What do you mean by “adaptation”?
The presence of specific body features (or certain habits) which enable an animal or a plant to live in a particular habitat (or surroundings) is called adaptation. The body features and habits that help animals (and plants) to adapt to their particular habitats or surroundings are a result of the process of evolution.
Name some countries where “tropical rainforests” are found.
The countries where tropical rainforest found are India, Indonesia, Kenya, Nigeria, Malaysia, Brazil, Uganda.
Write the factors which affect climate.
There are some important factors which determine the climate at place. Such as : Temperature, Rainfall, Altitude, Location.
- If a place is located near the equator, the place will be very hot and humid. Because that places absorbs most of the heat from the sun.
- Mawsynram, located in the Meghalaya State in India, is the wettest place in the world. It receives an annual rainfall of 11,871 millimeters. The mountainous terrain of the surrounding land forces the northward-moving warm moist monsoon winds coming from the Bay of Bengal to converge over Mawsynram. There are many equatorial other wet places in the world which they receive rainfall as much.
- Another factor which affects the climate of a place is its altitude, whether it is located on a high mountain or on plains. A place at higher altitude will have a cooler climate than another place on plains. This is why hill station always have a cool climate.
- A yet another factors which affects the climate at a place its location with respect to the sea, whether it is located near the sea or far away from the Sea. The temperature in coastal areas are neither very high nor very low.
What are “Arctic and Antarctic region” of the earth. Discuss.
Earth has two poles, north pole and south pole. The area situated near the poles of the earth are called “polar regions”. Some of the countries that belong to the polar regions of the earth are Canada, Iceland, Sweden, Norway, Finland, Alaska, Siberian region of Russia. All these countries actually belong to the north polar region which is also called “Arctic region”.
The south polar region of the earth is called “Antarctic region” or Antarctica. The polar regions of the earth have an extremely cold climate. The polar regions and the tropical regions are the two region of the earth which have severe climatic conditions.
The ice in the Arctic Ocean is largely formed from the frozen sea and contained by the surrounding land masses. It contains a large proportion of multi-layer sea-ice that is 3-4m (10-13 feet) thick with some much thicker ridges.
Antarctica is 98% covered in ice which means that away from coastal regions (and even including many coastal regions) the landscape is icy mountains, glaciers or smooth ice-sheet. There are no significant rivers and none that flow year-round, lakes are small, rare and often permanently frozen over, there is very little land vegetation, and no grassland, shrubs or trees.
Class 7 Science Chapter 7 Important Questions Set – 3
Write short notes on polar regions.
The polar regions present an extreme climate. These regions are covered with snow and it is very cold for most part of the year. For six months the sun does not set at the poles while for the other six months the sun does not rise. In winters, the temperature can be as low as –37°C. Animals living there have adapted to these severe conditions. Let us see how they are adapted by considering the examples of polar bears and penguins.
Discuss the adaptation of “polar bear”.
Polar bears have white fur so that they are not easily visible in the snowy white background. It protects them from their predators. It also helps them in catching their prey. To protect them from extreme cold, they have two thick layers of fur. They also have a layer of fat under their skin. In fact, they are so well-insulated that they have to move slowly and rest often to avoid getting overheated. Physical activities on warm days necessitate cooling. So, the polar bear goes for swimming. It is a good swimmer. Its paws are wide and large, which help it not only to swim well but also walk with ease in the snow. While swimming under water, it can close its nostrils and can remain under water for long durations. It has a strong sense of smell so that it can catch its prey for food.
Write short notes on “Tropical Rainforest”?
The tropical region has generally a hot climate because of its location around the equator. Even in the coldest month the temperature is generally higher than about 15°C. During hot summers, the temperature may cross 40°C. Days and nights are almost equal in length throughout the year. These regions get plenty of rainfall. An important feature of this region is the tropical rainforests. Tropical rainforests are found in Western Ghats and Assam in India, Southeast Asia, Central America and Central Africa. Because of continuous warmth and rain, this region supports wide variety of plants and animals. The major types of animals living in the rainforests are monkeys, apes, gorillas, tigers, elephants, leopards, lizards, snakes, birds and insects. The climatic conditions in rainforests are highly suitable for supporting an enormous number and a variety of animals.
What are the adaptation in “penguins”?
Penguin is an animal which lives in extremely cold is south polar region of the earth. Penguin is a sea bird which cannot fly. Penguins hunt for fish which they eat as food. Penguins can live in the extremely cold climate of the polar region due to the following adaptation:
- i) The white fur is not easily visible in the snowy white background.
- ii) It has a very strong sense of smell.
- iii) It helps the beer to locate and catch its prey.
- iv) It has long curved and sharp claws. These help it to walk on ice.
- v) It has a layer of fat under its skin. The fat insulates its body from cold and keeps it warm. These keep it warm in cold weather.
- vi) It has two thick layers of fur. It also has a thick skin and a lot of fat to protect it from cold.
- vii) The penguins huddled together. This they do to keep warm.
What are the probable reason for the migration of migratory birds?
There is more than one single reason for different birds to migrate. Such as, Siberian cranes migrates towards warmer region in the autumn by travelling several thousands of kilometers.
There are many possible reasons are given below:
- i) For all birds, one of the principles driving forces behind migration is “food scarcity”. If all birds were to stay in the same rich, tropical areas year-round, food would become scarce and breeding would be less successful with undernourished parents and hungry hatchlings.
- ii) Birds have evolved different migration patterns, timing, and destinations to disperse around the world to “breed their families”. This helps birds take advantage of a wide variety of suitable conditions to raise their young, increasing the chances of healthy, viable offspring. “Breeding colonies” that offer greater protection than a single pair of bird parents are all important for breeding dispersal.
- iii) Birds have evolved different types of plumage to survive different climates, and changes in those “climates” can affect migration.
- iv) Many birds even migrate to specialized habitats that are nearly “inaccessible to predators”.
- v) Any large group of birds crammed in one type of habitat is susceptible to “parasites and diseases” that can decimate thousands of birds in a short period of time.
Class 7 Science Chapter 7 Important Questions Set – 4
Explains the adaptation of elephants in tropical rainforest.
The elephant is another well-known animal of Indian tropical rainforest. It has adapted to the conditions of rainforests in many remarkable ways. It uses trunk as a nose because of which it has a strong sense of smell. The trunk is also used by it for picking up food. Moreover, its tusks are modified teeth. These can tear the bark of trees that elephant loves to eat. So, the elephant is able to handle the competition for food rather well. Large ears of the elephant help it to hear even very soft sounds. They also help the elephant to keep cool in the hot and humid climate of the rainforest.
How does the sun cause the change in the weather?
All changes in the weather are caused by the sun. The sun is a huge sphere of hot gases at a very high temperature. The distance of the sun from us is very large. Even then the energy sent out by the sun is so huge that it is the source of all heat and light on the earth. So, the sun is the primary source of energy that causes changes in the weather. Energy absorbed and reflected by the earth’s surface, oceans and the atmosphere play important roles in determining the weather at any place. If we live near the sea, we would have realised that the weather at our place is different from that of a place in a desert, or near a mountain.
Why it is not easy to predict the weather?
Because weather is such a complex phenomenon that can vary over a short period of time. It can happen sometimes that it is sunny in the morning but suddenly clouds appear from nowhere and it starts raining heavily or a heavy rain may vanish in a matter of minutes and give way to sunshine.
Discuss the adaptation of big cats in tropical rainforest.
The wild animals such as lions and tigers etc. are called big cats. The big cats are carnivorous which eat only the meat or other animals. The big cats can live and survive in the tropical rainforest due to the following adaptation:
- The big cats (as lion and tiger) can run very fast.
- The big cats have a highly developed sense of smell which helps them to locate their prey.
- The big cats have eyes in front of their heads which enable them to have an correct idea of the location of their prey.
- The yellow brown colour of lion and the yellow brown colour with black stripes of tiger helps them to hide in the forest without being seen easily.
- The big cats have long, strong and sharp claws in their front legs to catch their prey.
Would you believe that “Toucan” is different species? Discuss this adaptation.
Yes, it has some special ability to survive their own habitat. As there is competition for food, some animals are adapted to get food not easily reachable. A striking example is that of the bird “Toucan”.
- i) Toucan has a long and large beak which helps to reach the fruits attached to the ends of the branches of trees which are too weak to support its weight.
- ii) The feet of token are adapted for grasping the branches of trees firmly as two toes pointing forward and two toes pointing backward.
- iii) Toucan has the ability to change the colour of its feathers in order to blend with the surroundings. Due to this adaptation, toucan is not noticed easily by the predators and hence remains safe.
Class 7 Science Chapter 7 Important Questions Set – 5
Name some animals found in polar region.
Penguins, Fishes, Musk oxen, Polar bears, Reindeers, seals and birds etc., are found in polar region.
Why do we feel so miserable in summer afternoon and comparatively comfortable in the early morning?
As the maximum temperature of the day occurs generally in the afternoon while the minimum temperature occurs generally in the early morning. Due to these reasons, we feel so miserable in the afternoon and comparatively comfortable in the early morning.
If fish dies when taken out of water whereas a wall lizard will die if keep under water. Mention the term used to describe such abilities that allow fish and lizard to survive in their respective habitats.
“Adaptation” is the term used to describe such as abilities that allows an organism to survive in their respective habitats, e.g., fishes have gills that allowed them to live in water. While a wall lizard has lungs to perform the same functions (i.e., respiration) on land.
Hence, adaptation as specific body features or habitats which enable an organism to live in a particular habitat.
Why we do find animals of certain kind living in particular climatic conditions?
Features and habits that help animals to adapt to their surroundings are a result of the process of evolution. Animals are adapted to survive in the conditions in which they live. Animals living in very cold and hot climate must possess special features to protect themselves against the extreme cold or heat. For example, polar bears are adapted for Polar Regions. Polar bears have white fur so that they are not easily visible in the snowy white background. Another well-known animal living in the polar regions is the penguin. Penguins are white and merges well with the white background. It also has a thick skin and a lot of fat to protect it from cold. You may have seen pictures penguins huddled together. This they do to keep warm. With these adaptations it will not be possible for polar animals to survive in tropical region where it is hot.
How do migratory birds travel to the same place year after year?
Some of the probable reasons for how the migratory birds travel to the same place year after year are as follows:
- i) It seems that the migratory birds have a built-in sense of direction which tells them in which direction to fly to reach the same place.
- ii) Some migratory birds probably use land-marks to guide them to reach the same place.
- iii) Many migratory birds may be guided by the position of the sun during the day and by the position of stars at night to reach the same place.
- iv) There is also some evidence that the migratory birds may be using the magnetic field of earth to find the direction so as to reach the same place.