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Ask QuestionPosted by Vikash Kumar 6 years ago
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Vikash Kumar 6 years ago
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Meghna Thapar 5 years, 11 months ago
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Ashmiraa Mushtaq Mohammad 6 years ago
Naman Ahden 6 years ago
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Shalu Jain 6 years ago
Sharini Padayachi 6 years ago
Yogita Ingle 6 years ago
Red blood cells (Erythrocytes)
RBCs are the biconcave cells; also known as erythrocytes. RBCs contain the iron-rich protein called haemoglobin; give blood its red colour. RBCs are the most copious blood cell produced in bone marrows. Their main function is to transport oxygen from and to various tissues and organs.
Posted by Arifa Rahman 6 years ago
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Shalu Jain 6 years ago
Sharini Padayachi 6 years ago
Yogita Ingle 6 years ago
Stomata are microscopic pores found mostly on the underside of leaves. They are located in the epidermal tissue. Each stoma is surrounded by a pair of specialized, kidney shaped cells called guard cells, which possess chlorophyll and regulate the opening and closing of stomata. The primary function of stomata is to allow gaseous exchange during photosynthesis and respiration between the plant's internal tissues and the atmosphere. The process of transpiration also takes place through stomata.
Posted by Anurag Yadav 6 years ago
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Yogita Ingle 6 years ago
- The process of breathing is very important for carrying out life. This process is carried out through the respiratory system of the body.
- The air rich in oxygen in inhaled through the nostrils and is passed onto the nasal cavity where air is warmed and humidified by the mucus present in the nostril. The tiny hairs called ciliated epithelium filters out dust and other particles present in the air
- The nasal cavity is divided into two halves left and right by a wall of thin bone known as central septum.
- The air then passes through the windpipe also known as trachea. The trachea filters the air we inhale and branches into the bronchi.
- The trachea further divides into bronchi.
- Bronchi refers to two air tubes that carry the atmospheric air directly into the lungs.
- Lungs are the pair of main organ of the respiratory system where oxygen is taken into and carbon dioxide is expelled out. The red blood cells present in the blood absorbs the oxygen present in the oxygen rich blood in the lungs.
- They carry it and distribute it to all body cells and picks up the carbon dioxide produced by the cells.
- This gaseous exchange takes place in a tiny sac like structure present in the lungs and is known as Alveolus.
- Muscular sheets called diaphragm are also present in the chest cavity.
- The process of breathing is accompanied by the movement of diaphragm and the rib cage.
Posted by Anurag Yadav 6 years ago
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Posted by Lushanth Ul 6 years ago
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Meghna Thapar 5 years, 9 months ago
A generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy. Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.
Posted by Bhavy Pansuriya 6 years ago
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Vikash Kumar 6 years ago
Yogita Ingle 6 years ago
(i) Fission: is division, the parent cell divides into two or more cells. Fission can be of two types, namely, binary fission and multiple fission. In binary fission, the parent cell divides into two equal halves called daughter cells. During the multiple fission, the organism divides itself into numerous daughter cells.
(ii) Fragmentation: The parent body divides into two or more fragments. Later, each fragment develops into a new individual.
(iii) Regeneration: In these organisms, when the cell divides into numerous pieces, each piece proliferates and differentiates to regenerate new organisms. For example, when a lizard loses its tail, it grows a new one.
(iv) Budding: Some organisms develop buds on their body and these buds develop into a new individual, this is known as budding.
(v) Vegetative propagation: Reproduction through their vegetative parts such as leaves, roots, buds, and stems and this is known as vegetative propagation.
Posted by Prachi Loya 6 years ago
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Yogita Ingle 6 years ago
The structural & Functional unit of Kidney is ‘Nephron’
On the basis of position of nephron in to kidneys, they are of two types
1.Juxtamedullary nephrons – Their glomeruli is present in inner margin of cortex. Loop of Henle is present in medulla. Vasa recta is also present along with them
2. Cortical nephron – They are present in the renal cortex. Their loop of henle is comparitively short and its not deep into the medulla. Vasa recta is aslo absent. You can see their picture in this attachment
Posted by Prachi Loya 6 years ago
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Meghna Thapar 5 years, 11 months ago
Posted by Rina Rina 6 years ago
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Tenzin Dolker 6 years ago
Tenzin Dolker 6 years ago
Posted by Maulee Shree Mittal 6 years ago
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Tenzin Dolker 6 years ago
Yogita Ingle 6 years ago
Electric current flows through the coil when the switch is ON, and the iron core acts as an electromagnet. The iron core attracts the hammer towards it. The hammer hits the bell and produces a sound. The circuit breaks at the screw contact when the hammer moves towards the iron core. At this point, the iron core ceases to be an electromagnet. The hammer is pulled back to its original position due to the spring action of the steel rod, and then touches the contact again to complete the circuit. The circuit is completed and current flows through the coil again, and the hammer strikes the bell again. The process repeats itself and you hear a ringing sound since the hammer keeps hitting the bell, until the switch is released.
Posted by Bhanu Sahu 6 years ago
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Yogita Ingle 6 years ago
Formation of soil: Soil is formed by weathering. Weathering is the process of breaking down of rocks by the action of wind, water and climate. Formation of even one inch of soil takes many years.
Composition of Soil: Soil contains humus, water, clay, sand and gravel.
Posted by Naman Ahden 6 years ago
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Gaurav Seth 6 years ago
S.N. |
Differences |
Red Blood Cells/ Corpuscles (RBC) |
White Blood Cells/ Corpuscles (WBC) |
| 1 | Also called | Also called “Erythrocytes” | Also called “Leukocytes” |
| 2 | Origin | They are produced in red bone marrow. | Mostly bone marrow, also produced in lymph nodes, spleen, etc. |
| 3 | Nucleus | Nucleus Absent | Nucleus Present |
Yogita Ingle 6 years ago
| RBC – Red Blood Cells | WBC – White Blood Cells |
| Red blood cells are called Erythrocytes. | White Blood Cells are called Leucocytes or Leukocytes. |
| RBCs are shaped as bi-concave discs. | These have an irregular shape. |
| Size varies from 6 – 8 µm in diameter. | Size varies from 12 – 17 µm in diameter. |
| The lifespan of RBC is about 120 days. | The lifespan of WBC is around 12-20 days after which, they are destroyed in the lymphatic system |
| Red blood cells do not have a nucleus at maturity. | WBCs are characterized by the presence of a large central nucleus. |
| Due to the presence of haemoglobin, these cells appear red in colour. | These cells are colourless, as they do not have any pigment. |
| Only one type of RBCs exists. | Different types of WBC’s are found in the blood such as neutrophils, B lymphocytes, T lymphocytes, monocytes, basophils, eosinophils. |
| They help in the transport of respiratory gases to different parts of the human body | They help in producing antibodies to fight against diseases causing microbes. |
| RBCs are produced in the red bone marrow | These cells are produced in the red bone marrow, lymph nodes, and spleen, etc. |
Posted by Lakshman Singhania 6 years ago
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Meghna Thapar 5 years, 10 months ago
Glowing of bulb, heating of electric iron and heating water in geyser are the devices based on the heating effect of current.
Posted by Ayush Rajput 6 years ago
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Meghna Thapar 5 years, 10 months ago
The swift movement of the falling water droplets along with the rising air creates lightning and sound.
Posted by Ayush Rajput 6 years ago
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Yogita Ingle 6 years ago
Cyclones are also called Hurricane in USA and Typhoon in Japan and Philippines
Posted by Maulee Shree Mittal 6 years ago
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Meghna Thapar 5 years, 10 months ago
The resistance of a conductor is directly proportional to its length (l) and inversely proportional to its area of cross section (A).
R µ/l A
R = ρ I/A
where ρ is a constant of proportionality called specific resistance or resistivity of the material of the conductor.
Posted by Shiven Vikram 6 years ago
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Posted by Nehad Usmani 6 years ago
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Gaurav Seth 6 years ago
An electric bell consists of an iron core, on which is wound a wire as a coil. One end of the coil is connected to one terminal of a battery, and the other end to a steel rod that acts like a spring for the hammer touching the screw contact. The other terminal of the battery is connected to the screw contact with a switch in the middle.
Working of an electric bell
Electric current flows through the coil when the switch is ON, and the iron core acts as an electromagnet. The iron core attracts the hammer towards it. The hammer hits the bell and produces a sound. The circuit breaks at the screw contact when the hammer moves towards the iron core. At this point, the iron core ceases to be an electromagnet. The hammer is pulled back to its original position due to the spring action of the steel rod, and then touches the contact again to complete the circuit. The circuit is completed and current flows through the coil again, and the hammer strikes the bell again. The process repeats itself and you hear a ringing sound since the hammer keeps hitting the bell, until the switch is released.
Posted by Satyam Karn 6 years ago
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Any Khan 6 years ago
Yogita Ingle 6 years ago
Holozoic nutrition: It is a process by which animals take in their food. It involves different steps namely, ingestion, digestion, absorption, assimilation and egestion. Human beings exhibit holozoic mode of nutrition involving five basic steps.
- Ingestion: The process of taking food into the body is called ingestion.
- Digestion: the process in which the food containing large, insoluble molecules is broken down into small, water soluble molecules is called digestion.
- Absorption: The process in which the digested food passes through the intestinal wall into blood stream is called absorption.
- Assimilation: The process in which the absorbed food is taken in by the body cells and used for energy, growth and repair is called assimilation.
- Egestion: The process in which the undigested food is removed from the body is called egestion.
Shiven Vikram 6 years ago
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Any Khan 6 years ago
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Any Khan 6 years ago
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