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    • Posted by Jothir Harish 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Kritika Trehan 7 years, 9 months ago

    Convex lenses are thicker at the middle. Rays of light that pass through the lens are brought closer together (they converge). A convex lens is a converging lens.

    When parallel rays of light pass through a convex lens, the refracted rays converge at the focal point. The image formed is magnified (you can use this lens as a magnifier, or a simple camera lens by itself). It’s also called “positive” lens.

    Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens.

    When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus. The image formed is diminished. It’s also called “negative” lens. This lens can’t be used to form an image by itself, but in combination(s) with positive (converging) lenses it is used to shorten the focal length.

    This is just a basic, simple answer to your question. There are many types or shapes of concave / convex lenses

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    • Posted by Pawan Shukla 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Kritika Trehan 7 years, 9 months ago

    Recycling is the process of turning waste and used items into new, useful materials or products. This not only gives the old items a new lease of life, it also reduces the amount of raw material used to make new things from scratch.

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    • Posted by Raviraj Shetty 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Sonakshi Bairoliya 7 years, 9 months ago

    Hens

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    Lavanya Handa 7 years, 9 months ago

    Eggs

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    • Posted by Aditya Dash 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Lavanya Handa 7 years, 9 months ago

    Because liver is the part of an excretory organ Stay

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    • Posted by Keerthana C 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Aditya Dash 7 years, 9 months ago

    Our body is made up of 60 to 75% of water

    1Thank You

    Divya Pandey 7 years, 9 months ago

    We can leave without food 5 6 days but we can not leave without water for 1 day

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    • Posted by Aman Raj 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Annu Priya 7 years, 9 months ago

    Soil is important for us because plant obtain their nutrients from soil and animal are dependent on them

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    • Posted by Sadhana Sadhana 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Sonakshi Bairoliya 7 years, 9 months ago

    Meheran

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    • Posted by Samreen Kaur 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 0 answers
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    • Posted by Lovleen Shukla 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 0 answers
    ANSWER

    • Posted by Tulika Sagar 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Shravani Dhamne 7 years, 9 months ago

    Villi are small finger like projection which helps to increase absorption area of small intestine

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    • Posted by Tulika Sagar 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Amar Kumar 7 years, 9 months ago

    A microorganism or microbe is a microscopic organism, which may exist in its single-celled form, or in a colony of cells and include bacteria, protozoa, and some fungi and algae.

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    • Posted by Japnit Kaur 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Khushi Asha 7 years, 9 months ago

    Breathing rate of a person is 70 to80.

    1Thank You

    Kritika Trehan 7 years, 9 months ago

    This gives the lower of the average rate at 12 breaths per minute. Average resting respiratory rates by age are: birth to 6 weeks: 30–40 breaths per minute. 6 months: 25–40 breaths per minute.

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    • Posted by Kush Sauda 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yashasvi Pandey 7 years, 9 months ago

    Fingers like projections which helps to increase the surface area of small intestine

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    • Posted by Moksh Khanna 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Annu Priya 7 years, 9 months ago

    31622400

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    • Posted by Shravan Raut 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 0 answers
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    • Posted by Shrey Kumar 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Ayush Singh 7 years, 9 months ago

    Inhaled air has higher consternation of oxygen and exhaled air has co2

    1Thank You

    Noel Jijo 7 years, 9 months ago

    Inhaled air is oxygenated air which means which in oxygen that is important for all parts of a body. Whereas exhaled air is deoxygenated air which means that it is rich in carbon dioxide

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    • Posted by Nirmit Patel 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Eesha Verma 7 years, 9 months ago

    Soil helps in the growth of vegetables, fruits, plants and trees. Life without soil is not possible. That is why soil is important

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    Aditya Singh 7 years, 9 months ago

    It helps in irrigation of vegetables and fruits

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    • Posted by Shrishti Shukla 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Annu Priya 7 years, 9 months ago

    1,second

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    • Posted by Sandeep Jain 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 0 answers
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    • Posted by Anmol Gill 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Noel Jijo 7 years, 9 months ago

    Earth is a planet in our solar system in milky way galaxy.It is the only planet in our solar system where life exist and it is the planet which is blue in colour due to water because third fourth of the planet is covered by water so that is why it is blue in colour

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    • Posted by Harsh Joshi 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Amar Kumar 7 years, 9 months ago

    Insects have spiracles on their exoskeletons to allow air to enter the trachea. In insects, the tracheal tubes primarily deliver oxygen directly into the insects' tissues.The spiracles can be opened and closed in an efficient manner to reduce water loss.

    The trachea ,windpipe, is a cartilaginous tube that connects the pharynx and larynx to the lungs, allowing the passage of air, and so is present in almost all air-breathing animals with lungs.

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    • Posted by Shafin Shaikh 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 6 answers

    Annu Priya 7 years, 9 months ago

    Our blood is red because it contains red pigment called haemoglobin

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    Eesha Verma 7 years, 9 months ago

    Our blood is red due the presence of a substance called haemoglobin in our body

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    Noel Jijo 7 years, 9 months ago

    Each hemoglobin protein is made up subunits called hemes, which are what give blood its red color. More specifically, the hemes can bind iron molecules, and these iron molecules bind oxygen. The blood cells are red because of the interaction between iron and oxygen.

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    Kota Vaishnavi 7 years, 9 months ago

    Blood is always red, actually. Veins look blue because light has to penetrate the skin to illuminate them, blue and red light (being of different wavelengths) penetrate with different degrees of success. What makes it back to your eye is the blue light. Meanwhile, here's what happens to the blood in your body: The heart pumps blood to your lungs to pick up oxygen. The oxygen-rich blood is then pumped out to your body through your arteries. It's bright red at this point. From your arteries, the blood flows through tiny blood vessels called capillaries, where it gives up its oxygen to the body's tissues. Your lips have a lot of these capillaries, which is why they're red. Your blood, now exhausted of its oxygen, is dark red as it now returns to your heart through your veins. This article has been corrected from the original version.

    1Thank You

    Kota Vaishnavi 7 years, 9 months ago

    Blood is always red, actually. Veins look blue because light has to penetrate the skin to illuminate them, blue and red light (being of different wavelengths) penetrate with different degrees of success. What makes it back to your eye is the blue light.

    1Thank You

    Amar Kumar 7 years, 9 months ago

    Blood is red because of the presence of hemoglobin inside our red blood cells. Hemoglobin is a protein that forms a complex with iron molecules and together they transport oxygen molecules throughout the body. Iron has the property of reflecting red light and because there is so much iron in our blood, blood looks red. When hemoglobin is carrying a lot of oxygen ( when just leaving the lungs), blood is bright red. When most of the oxygen has been released to the body, blood is dark red.

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    • Posted by Rehman Khan 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Kritika Trehan 7 years, 9 months ago

    <th scope="col"> </th> <th scope="col">Cyclone</th> <th scope="col">Tornado</th> <th scope="row">About</th> <th scope="row">Rotation</th> <th scope="row">Intensity</th> <th scope="row">Location</th> <th scope="row">Most affected areas</th> <th scope="row">Frequency</th> <th scope="row">Occurrence</th> <th scope="row">Forms of precipitation</th>
    A cyclone is an atmospheric system of rapidly circulating air massed about a low-pressure center, usually accompanied by stormy often destructive weather. Storms that begin in the Southern Pacific are called <a href="https://www.diffen.com/difference/Cyclone_vs_Hurricane">cyclones</a>. A tornado is a rotating column of air ranging in width from a few yards to more than a mile and whirling at destructively high speeds, usually accompanied by a funnel-shaped downward extension of a cumulonimbus cloud. Winds 40-300+ mph.
    Clockwise in the southern hemisphere and counterclockwise in the northern hemisphere. Clockwise in the southern hemisphere and counterclockwise in the northern hemisphere
    Commonly quite strong. The scale for measuring cyclones is called the Beaufort Scale and Saffir-Simpson scale and may vary in different countries.Winds may approach 300kph and cause widespead damage. The scale used for rating the strength of tornadoes is called the Fujita (F), Enhanced Fujita (EF), and TORRO (T) Scale.
    Southern Pacific Ocean, Indian Ocean. Cyclones in the northwest Pacific that reach (exceed) 74 mph are "typhoons". Tornados have been spotted in all continents except Antarctica.
    Pacific Ocean In areas where a convergence of cold and warm fronts is common. i.e. US Midwest.
    10-14 per year The United States records about 1200 tornadoes per year, whereas the Netherlands records the highest number of tornadoes per area compared to other countries. Tornadoes occur commonly in spring and the fall season and are less common in winters
    warm areas Places where cold and warm fronts converge. Can be just almost anywhere.
    rain Rain, sleet, and hail

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    • Posted by Swaliha Farha 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Kritika Trehan 7 years, 9 months ago

    During respiration in plants, very little transport of gases takes place from one plant part to another. Therefore, each plant part takes care of its own energy needs, or in other words, its gas exchange need. Roots, stems andleaves of plants exchange gases for respiration separately. We already know, leaves of plants have tiny pores called stomata, which is used for the exchange of gases. The oxygen, taken in through stomata is used by the cells in the leaves to break down glucose into carbon dioxide and water.

    Similarly, roots of plants take in air from the air spaces present between the soil particles. Thus, the oxygen absorbed through roots are used to release energy. And energy is utilised for the transport of minerals and salts from the soil.We are aware of the fact that plants have the unique ability to photosynthesise. <a href="http://byjus.com/biology/photosynthesis/">Photosynthesis</a>is the process through which plants prepare their own food. It takes place only in the parts of plants that contain chlorophyll, i.e. only in the green parts of the plants. The process of photosynthesis is so prominent that it sometimes masks the process of respiration in plants. However, we must know that respiration in plants occurs throughout the day while photosynthesis takes place only in the presence of light. Therefore, at night the respiration in plants becomes prominent. That is why we often hear that people are asked not to sleep under a tree at night . This may cause suffocation due to the excessive presence of carbon dioxide released by trees as a result of respiration.

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    • Posted by Chandan Mishra 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Noel Jijo 7 years, 9 months ago

    There are many components in the blood and they are Plasma it is the fluid part of the blood Red blood cells. Red blood cells are red in colour because of a red pigment known as hemoglobin which binds with oxygen and goes to all part of our body White blood cells. These are the blood cells which fight and protect us from germs and infections that into our body and can cause harm To us Platelets. These are the blood cells which help us in clotting of blood in any site of injury and helps to be safe and reduce the loss of blood which can even cause death

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    Kushal Kothari 7 years, 9 months ago

    Platelets Plasma Red blood cells( wbc) White blood cells( rbc)

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    • Posted by Alwin Alwin 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Daksh Tiwari 7 years, 9 months ago

    Gadhai

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    Alwin Alwin 7 years, 9 months ago

    Na-Sa2\4

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    • Posted by Subhashini Subhashini 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Kritika Trehan 7 years, 9 months ago

    A weather <a href="https://www.collinsdictionary.com/dictionary/english/forecast" title="Definition of forecast">forecast</a> is a statement saying what the weather will be like the next day or for the next few days.

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    • Posted by Shaikh Akil 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Kushal Kothari 7 years, 9 months ago

    Simbiotic relationship

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    • Posted by Kunal Gupta 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Noel Jijo 7 years, 9 months ago

    There are two types of reproduction in plants they are asexual reproduction in which only one parent is needed and the plants are exact copy of there parent plant Sexual reproduction in which both parents are needed and the plants can have both the characteristics of both the parents and is produced by seeds

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    • Posted by Peole Banerjee 7 years, 9 months ago

    CBSE > Class 07 > Science
    • 0 answers
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