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Kritika Trehan 7 years, 9 months ago
Weathering and Erosion in Desert Environments. Through time, erosion progressively carves canyons into mountainous areas. Mountain stream channels are self-perpetuating; as water gathers into rills and channels, the greater the flow, the greater the erosive force.
Major rainfall events can cause major erosion, especially because the desert does not have a covering of vegetation to protect it. But rainfall is infrequent in deserts and in between storms, there will be continuous abrasive erosion by wind-blown sand. Which is the most important? That depends on storm frequency, wind strength, rock types - and a host of other variables.
Posted by Amtoj Buttar 7 years, 9 months ago
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Joan Mariam Jijo 7 years, 9 months ago
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Kritika Trehan 7 years, 9 months ago
| Sr.no | Red Blood Cells | White Blood Cells |
| 1. | RBC’s are also called as erythrocytes. | White Blood Cells are also called as Leucocytes |
| 2. | The red blood cells do not have the nucleus | They are characterised by the presence of a large central nucleus |
| 3. | Due to the presence of pigment haemoglobin in them, they give red color to the blood | These cells do not have any kind of pigment in them, hence these are colorless |
| 4. | RBCs appear as biconcave disc in shape | These have an irregular shape |
| 5. | These cells have a life -span of about 120 days | These have a life -span of around 4-30 days which depends upon the body |
| 6. | Only one kind of RBC’s are found in the blood | Different types of WBC’s are found in the blood such as neutrophils, B lymphocytes, T lymphocytes, monocytes, basophils,eosinophils. |
| 7. | The function of RBC is to supply oxygen to different parts of human body and carry out the carbon dioxide as waste product | The function of WBC is to produce antibodies in order to fight against diseases |
| 8. | RBC ’s are produced in the red bone marrow | These cells are produced in the lymph nodes and spleen, etc. |
| 9. | The components of red blood cells are haemoglobin | The components of white blood cells are antibodies with the presence of MHC antigen cell markers. |
| 10. | These cells make up around 36-50% of human blood | They make up around 1% of the human blood |
Posted by Aastha Karwa 7 years, 9 months ago
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Khushi Shekhawat 7 years, 9 months ago
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Posted by Sonakshi Bairoliya 7 years, 9 months ago
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Kritika Trehan 7 years, 9 months ago
The kidneys are a pair of organs, each about the size of a fist, located on either side of your spine. They’re responsible for purifying your blood by removing waste and excess fluid from your body. When the kidneys don’t work properly, dialysis is used to perform the function of the kidneys.
It’s a treatment that takes over your kidney functions if those organs stop doing their job. There are two types of dialysis:
Hemodialysis: Your blood is put through a filter outside your body, cleaned, and then returned to you. This is done either at a dialysis facility or at home.
Peritoneal dialysis: Your blood is cleaned inside your body. A special fluid is put into your abdomen to absorb waste from the blood that passes through small vessels in your abdominal cavity. The fluid is then drained away. This type of dialysis is typically done at home.
Excretion: All living things produce waste that they have to get rid of.
If they don't, it builds up in their bodies and can become harmful.
The process of removing waste products is called excretion.
Posted by Gurmeet Kaur 7 years, 9 months ago
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Annu Priya 7 years, 9 months ago
Posted by Harjot Waraich 7 years, 9 months ago
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Kritika Trehan 7 years, 9 months ago
Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. They are produced in pairs with a gap between them that forms a stomatal pore. The stomatal pores are largest when water is freely available and the guard cells turgid, and closed when water availability is critically low and the guard cells become flaccid.
Posted by Nadeem Khan 7 years, 9 months ago
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Kritika Trehan 7 years, 9 months ago
An instrument showing the time by the shadow of a pointer cast by the sun on to a plate marked with the hours of the day.
Posted by Ayan Gupta 7 years, 9 months ago
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Kritika Trehan 7 years, 9 months ago
A small metallic bob suspended by a light inextensible string from a rigid support, such that it is free to oscillate without friction about a point, is called a simple pendulum.
Posted by Ayan Gupta 7 years, 9 months ago
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Kritika Trehan 7 years, 9 months ago
A body is said to be at rest if its position does not change with time with respect to an observer (or a reference point). For example, the chairs of the dining table are at rest with respect to the dining table; the passengers sitting in a moving bus are said to be at rest with respect to the driver of the same bus, because their positions do not change with respect to the driver.
Posted by Shivam Samal 7 years, 9 months ago
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Eesha Verma 7 years, 9 months ago
Ayan Gupta 7 years, 9 months ago
Posted by Sreelakshmi Rajesh 7 years, 9 months ago
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Kritika Trehan 7 years, 9 months ago
Velocity is defined as a vector measurement of the rate and direction of motion or, in simpler terms, the rate and direction of the change in the position of an object.
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