Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Rajan S 5 years, 5 months ago
- 1 answers
Posted by Lekha Pathikonda 5 years, 5 months ago
- 1 answers
Posted by Aadil Raza 5 years, 5 months ago
- 1 answers
Padhu H.S 5 years, 5 months ago
Posted by Suhani Sabat 5 years, 5 months ago
- 3 answers
Posted by Rahul Kumar 5 years, 5 months ago
- 1 answers
Posted by Balaji Temkar 5 years, 5 months ago
- 1 answers
Yogita Ingle 5 years, 5 months ago
Air is a mixture of gases, water vapour and dust particles. Some of the gases; present in air; are discussed below.
Nitrogen: Nitrogen is the largest component of air. Nitrogen makes up 79% of air around us. Nitrogen is used by plants to make protein. Plants cannot take nitrogen directly from the air. Some nitrogen fixing bacteria live in soil. They help in nitrogen fixation in soil. Thus, plants are able to take nitrogenous compounds from the soil.
Oxygen: Oxygen is the second largest component of air. Oxygen makes up 21% of the air around us. Oxygen is used by living beings for respiration. After respiration, the living beings produce carbon dioxide.
Carbon dioxide: The remaining 1% of air is composed of carbon dioxide, many other gases, water vapour and dust particles. Carbon dioxide is also important for living beings. Plant need carbon dioxide to make food during photosynthesis. During photosynthesis, plants take in carbon dioxide and release oxygen. Thus, green plants help in maintaining the balance of carbon dioxide and oxygen in atmosphere.
Posted by Mamatha D Mamatha D 5 years, 5 months ago
- 1 answers
Posted by Shikha Kashver 5 years, 5 months ago
- 1 answers
Shikha Kashver 5 years, 5 months ago
Posted by Anna Gurkahad A 5 years, 5 months ago
- 1 answers
Yogita Ingle 5 years, 5 months ago
- The image produced when the light arising from an object appears to strike a certain point
- It cannot be captured on a screen as it is the imaginary intersection of ray of light
- The images are erect
Posted by Xyz Abc 5 years, 6 months ago
- 6 answers
Foram Mandali 5 years, 5 months ago
Yogita Ingle 5 years, 6 months ago
Robert Hook discovered cells in 1665. When he observed thin slices of cork (part of bark of a tree) under a self-designed microscope, he noticed that there are many partitioned boxes or compartments like a honeycomb. Each box was separated from the other by a wall. Hook coined the term “cell” for each box.
Posted by Rama Dey 5 years, 6 months ago
- 5 answers
Ritesh Yadav 5 years, 5 months ago
Aditi Kumari 5 years, 5 months ago
Yogita Ingle 5 years, 6 months ago
Water pollution can be defined as the contamination of water bodies. Water pollution is caused when water bodies such as rivers, lakes, oceans, groundwater, and aquifers get contaminated with industrial and agricultural effluents.
When water gets polluted, it adversely affects all lifeforms that directly or indirectly depend on this source. The effects of water contamination can be felt for years to come.
@Purbita# ******* 5 years, 6 months ago
Posted by @Purbita# ******* 5 years, 6 months ago
- 3 answers
Yogita Ingle 5 years, 6 months ago
Electroplating is done to prevent rusting of metals and to give them an attractive and shiny look. Chromium is used to electroplate car parts, bath taps, kitchen gas, etc. burners to give them a shiny look. Chromium is a bright , shiny metal.
Posted by Spandan Chaudhari 5 years, 6 months ago
- 3 answers
Posted by Neetu Neetu 5 years, 6 months ago
- 2 answers
Posted by Riju Roy 5 years, 6 months ago
- 3 answers
Ritesh Yadav 5 years, 5 months ago
Yogita Ingle 5 years, 6 months ago
Silk is a natural protein fibre which can be used as a textile fibre. It is one of the important animal fibres obtained from silkworm.
Posted by Laden Bhutia 5 years, 6 months ago
- 4 answers
Ritesh Yadav 5 years, 5 months ago
Utkarsh Shukla 5 years, 6 months ago
Posted by Gurlal Singh 5 years, 6 months ago
- 1 answers
Posted by Bahuguna Sandeep 5 years, 6 months ago
- 3 answers
Ritesh Yadav 5 years, 5 months ago
Dev Sehrawat 5 years, 6 months ago
Meghna Thapar 5 years, 6 months ago
The transfer of pollen grains from the anther of a stamen to the stigma of a carpel is called pollination.
Posted by Naidu Diptirani 5 years, 6 months ago
- 3 answers
Dev Sehrawat 5 years, 6 months ago
Naidu Diptirani 5 years, 6 months ago
Posted by Anshu Man Naik 5 years, 6 months ago
- 1 answers
Meghna Thapar 5 years, 6 months ago
Advantages of friction:
- We are able to walk on ground because friction between the sole of our shoes and ground prevents us from slipping over the ground.
- Friction between tyres of a car and the road enables a car to move forward on road without skidding.
- The brakes of a car or a bicycle work by friction.
- We are able to write and make drawings on paper because there is friction between the tip of pencil and paper.
- We can hold a glass tumbler in our hands because of friction between the glass tumbler and our hands.
- We are able to fix nails in a wall due to friction.
Disadvantages of friction:
- Friction wears away the soles of our shoes.
- The tyres of vehicles wear out gradually due to friction.
- Friction wears out the rubbing machine parts.
- Friction wears out the brake pads of vehicles gradually.
- Friction wears out steps of staircases in buildings and foot over-bridges.
- Friction produces heat which may damage machines.
Posted by Neel Shetty 5 years, 6 months ago
- 3 answers
Ritesh Yadav 5 years, 5 months ago
Akshay Sherithh 5 years, 6 months ago
Abhi/ Nabanita/Priency Panda 5 years, 6 months ago
Posted by Karan Mohnani Mohnani 5 years, 6 months ago
- 2 answers
Posted by Vaibhavi Kunjir 5 years, 6 months ago
- 2 answers
Aaditya Narayan Sharma 5 years, 6 months ago
Posted by Vaibhavi Kunjir 5 years, 6 months ago
- 2 answers
Aaditya Narayan Sharma 5 years, 6 months ago
Posted by Vaibhavi Kunjir 5 years, 6 months ago
- 1 answers
Meghna Thapar 5 years, 6 months ago
Friction on carrom board can be reduced by sprinkling talcum powder on it.
Posted by Vaibhavi Kunjir 5 years, 6 months ago
- 1 answers
Advait Deshmukh 5 years, 6 months ago
Posted by Naveen Naveen 5 years, 6 months ago
- 4 answers
Spandan Chaudhari 5 years, 6 months ago
Meghna Thapar 5 years, 6 months ago
Incomplete combustion of fuel in the insufficient oxygen leads to the production of carbon monoxide.
Posted by Sindi Samra 5 years, 6 months ago
- 4 answers
Ritesh Yadav 5 years, 5 months ago
Yogita Ingle 5 years, 6 months ago
There are five major groups of microorganism. These are as follows:
- Bacteria
- Algae
- Protozoa
- Fungi
- Viruses
Posted by Nirmalya Madhu 5 years, 6 months ago
- 1 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Padhu H.S 5 years, 5 months ago
1Thank You