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Meghna Thapar 5 years, 6 months ago
Each living cell has the capacity to perform certain basic functions that are characteristic of all living forms. There is a division of labour in multicellular organisms such as human beings. Different parts of the body perform different functions like the human body has a heart to pump blood and stomach to digest food. Similarly, division of labour is also seen within a single cell. Each cell has got certain specific components within it known as cell organelles which perform a special function such as making new material in the cell, clearing up the waste material from the cell.
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Posted by Mrinal Sharma 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
In whitewash Calcium hydroxide is present.Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of white washing and gives a shiny finish to the walls.
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Posted by ꧁༒☬Guddu☬༒꧂ ~~~~P®O Boy~~~ 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Respiratory system in human beings:
The respiratory system in human beings consists of the nose, pharynx, larynx, trachea, bronchi and lungs.
- Air is taken in through the nostrils.
- Nostrils further continue into the nasal cavity.
- There is a bony plate called the palate, which separates the oral cavity from the nasal cavity.
- Nasal cavity opens into the pharynx.
- The pharynx is a muscular chamber acting as a common passage for the windpipe or trachea and the food pipe or oesophagus.
- It is connected to the larynx through a slit-like opening called the glottis.
- The larynx connects the pharynx to the trachea.
- The trachea shows the presence of cartilaginous rings.
- The cartilaginous rings provide flexibility thus, facilitating continuous air flow.
- The inner wall of the trachea is lined by a mucous membrane consisting of ciliated columnar epithelium.
- The trachea divides into two branches or tubes called bronchi, one of which enters the right lung and the other enters the left lung.
- The bronchi have cartilaginous rings for distention.
- Each bronchus divides into fine secondary bronchi. These bronchi further divide into finer tertiary bronchi. In the lungs, each bronchus finally divides into finer and smaller branches called bronchioles.
- The bronchioles further divide to form smaller terminal bronchioles.
- The bronchioles divide repeatedly to form a cluster of tiny air chambers called air sacs or alveoli.
- Alveoli have thin and moist walls which enable gaseous diffusion with blood capillaries.
- The lungs are a pair of spongy and elastic respiratory organs protected by a bony rib cage.
- The base of the lungs rests on the diaphragm.
- Each lung is covered by two membranes. The inner membrane is called the inner or visceral pleura and the outer membrane is called the outer or parietal pleura.
- The diaphragm is a curved, musculo-fibrous sheath which separates the thoracic cavity from the abdominal cavity.
- The diaphragm plays a major role during respiration.
Posted by Arif Ali 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
we have f = 15cm
we use the relations between radius and focal length
i. e R = 2F
putting the value of focal length (f) i.e.15cm(given)
we get that R = 30cm
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Yogita Ingle 5 years, 8 months ago
Saprotrophs are the living entities that derive their nutrition from the dead and decaying organic matter. Saprothrophs do not require a host. As they derive nutrition from dead matter, they are often termed as cleaning agents. Fungi and a few other bacteria are good examples of saprotrophs
Posted by Vansh Karkhur 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The process of photosynthesis occurs when green plants use the energy of light to convert carbon dioxide (CO2) and water (H2O) into carbohydrates. Light energy is absorbed by chlorophyll, a photosynthetic pigment of the plant, while air containing carbon dioxide and oxygen enters the plant through the leaf stomata.
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Meghna Thapar 5 years, 8 months ago
The normal line divides the angle between the incident ray and the reflected ray into two equal angles. The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.
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Yogita Ingle 5 years, 8 months ago
A human digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body. The food we take in is digested and utilized by our body and the unused parts of the food are defecated. Human digestive system is the sum of the gastrointestinal tract (GIT; also called alimentary canal) and accessory organs (tongue, liver, pancreas, etc). These two parts together help in digestion in humans.
The alimentary canal is the long tube through which the food that we eat is passed. It begins at the mouth (buccal or oral cavity), passes through the pharynx, esophagus or food pipe, stomach, small intestines, large intestines, rectum and finally ends at the ****. The food particles get digested gradually as they travel through various compartments of the alimentary canal. Accessory organs are organs which participate in the digestion process but are not actually a part of GIT. They stimulate the digestion by releasing certain enzymes.
Food begins its journey through the digestive system in the mouth, also known as the buccal cavity or the oral cavity. The mouth has many accessory organs such as the tongue, teeth, and salivary glands, which help in the digestion of food. Teeth grind the food into small pieces. Salivary glands secrete saliva which contains an enzyme called the salivary amylase. This enzyme breaks down starch content and moistens the food, before the tongue and other muscles push the food into the pharynx.
Pharynx: The pharynx passes the chewed food from the mouth to the esophagus. The flap of tissue known as the epiglottis present in pharynx prevents food from entering into the wide pipe
Esophagus or Food Pipe: The esophagus is a muscular tube connecting the pharynx to the stomach. It carries swallowed masses of chewed food along its length and pushes it down to the stomach.
Stomach: The stomach is a thick-walled muscular bag that is located on the left side of the abdominal cavity. It is the largest part of the human digestive system. Stomach acts as a storage tank for food so that the body has time to digest large meals properly. It receives food from the food pipe at one end and opens into the small intestine at the other end. The inner walls of the stomach consist of the gastric glands which secrete mucous, hydrochloric acid and digestive enzymes. These continue the digestion of food that began in the mouth.
Mucous protects the lining of the stomach while acid kills bacteria that enter the body along with the food. Hydrochloric acid also makes the medium in the stomach acidic, which helps the digestive enzymes like pepsin to act. The digestive enzymes break down proteins into simpler substances.
Small Intestine: The small intestine is the longest part of the human digestive system. It is a highly coiled long, thin tube which is about 7.5 metres in length. The length of the small intestine depends on the diet of the organism. A major proportion of digestion takes place in the small intestines. All types of nutrients are digested here with the help of secretions which it receives from the liver and the pancreas. The walls of the small intestine also secrete juices for digesting food.
The liver releases bile juice which alkalizes the acidic food received from the stomach and also emulsifies the fat content. The pancreatic juice digests the proteins and lipids. Finally, the intestinal secretions convert the carbohydrates into glucose, proteins to amino acids and fats into fatty acids and glycerol.
Once the food is broken down into the simple particles, it is ready to be absorbed by the body. The villi, finger-like projections present on the walls of the small intestine, absorb the digested food by increasing the surface area. The absorbed food is then transported to different parts of the body through the blood vessels for cell activities.
Large Intestine: The large intestine is a long, thick tube which is about 1.5 meters long. The large intestine absorbs water and small amounts of nutrients from the undigested food with the help of many symbiotic bacteria residing in it. The remaining waste passes into the rectum, where it remains as semi-solid feces. Feces exit the body through the **** via time-to-time excretion. This process is called Digestion.
Posted by Hema Sri 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
Limitation of Ohm's Law
This law cannot be applied to unilateral networks. A unilateral network has unilateral elements like diode, transistors, etc., which do not have same voltage current relation for both directions of current. Ohm's law is also not applicable for non – linear elements.
Posted by Sahil Kumar 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
Static electricity is caused by the build up of electrical charges on the surface of objects, while current electricity is a phenomenon from the flow of electrons along a conductor. When objects are rubbed, a loss and/or gain of electrons occurs, which results in the phenomenon of static electricity.
Posted by Gourav 9Th Standard Kumar 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
Glucose is called as source of instant energy because it gets rapidly absorbed by our body. Glucose is simple sugar which is formed when carbohydrate get broken. Also, the carbohydrates get digested into glucose. Since, glucosedoes not have to be digested, it acts as an instant source of energy.
Posted by Shreeyanshi Shukla 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
The air bubble inside water behaves like a concave lens because the normal at any point of a spherical bubble will pass through the center of the bubble. It is clearly visible that the air bubble acts as a diverging lens.
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Yogita Ingle 5 years, 8 months ago
In physics, the motion is the change in position of an object with respect to its surroundings in a given interval of time.
Motion of an object depends on the type of force acting on the body. Examples of different kinds of motion are given below.
- Translational – It is the type, where an object moves along a path in any of the three dimensions.
- Rotational – It is the type, where an object moves along a circular path about a fixed axis.
- Linear – It is a type of translational motion where the body moves in a single direction along a single dimension.
- Periodic – It is the type of motion that repeats itself after certain intervals of time
- Simple Harmonic – It is the type of motion like that of a simple pendulum where a restoring force acts in the direction opposite to the direction of motion of the object. This restoring force is proportional to the displacement of the object from mean position.
- Projectile – It is the type of motion which has a horizontal displacement as well as vertical displacement.
- Oscillatory – It is the type of motion which is repetitive in nature within a time frame. If it is mechanical in nature it is called vibration.
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