Last updated on October 5th, 2023 at 11:39 pm
Class 7 The World Around Us
Activity 2 Water Question Answers
Q: What is water’s role in our body?
Water is the basic component of each cell and essential for our existence. It keeps our body temperature at 36.8 degree Celsius, forms part of blood, helps carry oxygen and nutrients to our cells, and removes waste materials from our body.
Q: What are some everyday uses of water?
Water is used for cooking food, washing clothes and dishes, cleaning different things, bringing water to plants, flushing the toilet, and for recreation like swimming, sailing, and fishing.
Q: How important is water in agriculture?
Water is essential in agriculture, and it takes a lot of water to produce food for the world’s population. In fact, it takes as much water as in a 10 M deep, 100 M wide, and 7.1 million kilometers in length to produce food for today’s world population every year.
Q: What is the importance of water for animals and plants?
Almost every water body found on Earth is an important habitat for plants and animals. Life begins in water, and even today, half the world’s creatures live underwater.
Q: What is the role of water in industrial production?
Almost all industrial units use water either in the production or disposal of by-products. This is one of the main reasons why industrial belts have developed along river banks. Water is also an important component in power production. River water is used to produce hydroelectricity by building dams and through thermal power plants.
Activity 3
| A | B |
| Essential | Fish-Water,Birds/Animals-Forests/Trees |
| Habitat | Car-Tyre,Music-Harmony,Blood-Water |
| Production | Air-Food |
| Dispose | Yoga,Dance,Music,Sports |
| Recreation | Garbage ,Waste |
| Component | Agriculture , Industry |
Activity 6 Do you know where the energy comes from Question Answers
Â
Q: What is electricity, and how is it used in our daily lives?
Electricity is a form of energy that we use in almost all activities of life, directly or indirectly. We use it for lighting, heating, cooling, cooking, transportation, communication, and many other purposes.
Q: What are the different sources of energy?
There are many different sources of energy, including non-renewable sources like petroleum, kerosene, coal, etc., and renewable sources like wind energy, hydroelectric energy, and solar energy.
Q: What are the advantages and disadvantages of non-renewable sources of energy?
Non-renewable sources of energy are the primary source of energy today. They are used to produce energy and run vehicles and cooking appliances. However, they also pollute the environment and will one day be exhausted.
Q: What is the importance of renewable sources of energy?
Renewable sources of energy, like wind energy, hydroelectric energy, and solar energy, are sustainable and do not pollute the environment. They are the future of energy production and should be adopted to reduce dependence on non-renewable sources of energy.
Q: What is energy conservation, and why is it important?
Energy conservation refers to the practice of using energy efficiently and avoiding wastage. It is important because it reduces energy consumption, saves money, and reduces environmental pollution. Energy conservation can be achieved through various means, such as using energy-efficient appliances, reducing unnecessary energy consumption, and adopting sustainable practices.
Activity 9 World Without Chocolates Question Answers
Q: What are chocolates made from, and where do cocoa trees grow?
Chocolates are made from cocoa, which grows on cocoa trees that are cultivated in the forests of South America.
Q: What are some other everyday items that originate from plants or animals?
Rice, clothes, and rubber tires are some examples of everyday items that originate from plants or animals.
Q: What is biodiversity, and what does it encompass?
Biodiversity is the variety of life around us, encompassing everything that living things do and the interactions of living things with each other and their environment. It includes a variety of organisms living in an environment of plants, animals, insects, and human life.
Q: Why is biodiversity important?
Biodiversity is important because it helps maintain the balance of ecosystems and provides important services such as pollination, nutrient cycling, and water purification. It also has economic, cultural, and aesthetic value.
Q: What are some threats to biodiversity?
Some threats to biodiversity include habitat loss and fragmentation, climate change, pollution, overexploitation of natural resources, and invasive species. These threats can lead to the extinction of species and the disruption of ecosystem functions.
Â
Extra question answers
Que:- What are some uses of water?
We use water to cook food, was utensils, clean different things, watering plants and flush toilets.
Que:- Which recreation activities can be done with water?
We also use for recreation like swimming, sailing and fishing.
Que:- For how many days a person can survive without food and water.
A person can survive without food for more than 30 days but less than a week without water.
Que:- What are the functions of water for our body or how water is helpful for our body?
Water keeps our body temperature at 36.8 degree Celsius, forms part of blood, helps carry oxygen and nutrients to our cells and removes waste material from our body.
Que:- How water is useful in producing electricity?
River water is used to produce hydroelectricity by building dams and through thermal power plants.
Que:- What are the different sources of energy?
There are many different sources of energy which include non-renewable sources like petroleum, kerosene, coal etc. And renewable sources like wind energy, hydroelectric energy and solar energy.
Que:- Which are two major disadvantages of non-renewable energy?
They are non-renewable and fast consuming
It pollutes the environment.
Activity 9
Chocolates are made from cocoa trees.
Que:- Which place are cocoa trees cultivated?
Cocoa trees are cultivated in the forests of South America.
Que:- Define biodiversity.
Biodiversity is made up of 2 different words bio+diversity.bio means life and diversity means variety. Biodiversity is the variety of life around us.
