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The Proposal is a one-act play that begins with a young man, Lomov presenting a marriage proposal to his neighbour’s daughter. Before he could actually convey it to the girl, they enter into an argument about Oxen Meadows. Chubukov, the lady’s father also joins the heated discussion. After they end this, they enter into another argument about their dogs and which one is better than the other. In the midst of all this, proposal gets forgotten until Lomov falls off due to his palpitations and Chubukov instantly puts her daughter’s hands in Lomov’s. Unfortunately, the quarrelling still continues.
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Yogita Ingle 5 years, 3 months ago
- In 1864, Newlands arranged the known 56 elements in the order of increasing atomic masses.
- He observed that the properties of every eighth element are similar to the properties of the first element.
- Based on this observation, he proposed the Law of Octaves for the classification of elements.
- Law of Octaves: When the elements are arranged in the increasing order of their atomic masses, the properties of every eighth element are similar to the first.
Posted by Laxmi Narayan 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Ap=BP ....(length of tangents from external point to circle are equal)
∠A=∠B=90o .... (Tangent is ⊥ to radius)
OP=OP .... (common side)
∴△AOP≅△BOP ....(RHS test of congruence)
∠APO=∠BPO=30o→c.a.c.t
∠AOP=∠BOP=60o→c.a.c.t
△AOP is 30o−60o−90o triangle.
∴△AOP,
cos60=OPOA
OP= a/ 1/2=2a
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Double Displacement Reaction:Reactions in which ions are exchanged between two reactants forming new compounds are called double displacement reactions.
<i>AB + CD → AC + BD</i>
Example: When solution of barium chloride reacts with the solution of sodium sulphate, white precipitate of barium sulphate is formed along with sodium chloride.
<i>BaCl2 + Na2SO4 → BaSO4 + 2NaCl</i>
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Yogita Ingle 5 years, 3 months ago
Let us have a detailed look at the different parts of the respiratory system and their functions.
Nose
The nose possesses a couple of exterior nostrils, which are divided by a framework of cartilaginous structure termed as the septum. This is the structure that evenly separates the right nostril from the left nostril. Tiny hair follicles that cover the interior lining of nostrils acts as the body’s first line of defence against foreign <a href="https://byjus.com/biology/pathogen/">pathogens</a>. Furthermore, they provide additional humidity for inhaled air.
Larynx
Two cartilaginous chords lay the framework for the larynx. They are situated at the point of joining the pharynx and trachea. It is also termed as Adam’s apple or the voice box. It is the portion which rises and falls during swallowing of food particles. It generates sound as air passes through the hollow in the middle.
Pharynx
The nasal chambers open up into a wide hollow space termed as the pharynx. It is a common path for both air and food. It functions by preventing the entry of food particles into the windpipe. The epiglottis is an elastic cartilage, which serves as a switch between the larynx and the oesophagus by allowing the passage of air into the airway to the lungs, and food in the <a href="https://byjus.com/biology/gastrointestinal-tract/">gastrointestinal tract</a>.
Have you ever wondered why we cough when we eat or swallow?
Talking while we eat or swallow results in incessant coughing. The reason behind this reaction is the epiglottis. It is forced to open for the air to exit outwards and the food to enter into the windpipe, triggering a cough.
Trachea
The trachea or the windpipe rises below the larynx and moves down to the neck. The walls of trachea comprise C-shaped cartilaginous rings which give hardness to the trachea and maintain it by completely expanding. The trachea extends further down into the breastbone and splits into two bronchi, one for each lung.
Bronchi
The trachea splits into two tubes termed as bronchi, which enter each lung individually. The bronchi divide into secondary, tertiary, and to bronchioles, which is again further divided into small air-sacs called the alveoli. The alveoli are minute sacs of air with thin walls and single-celled manner. It enables the exchange of oxygen and carbon dioxide molecules into or away from the bloodstream.
Lungs
Lungs are the chief centres of the respiration in humans and other vertebrates. They are located in the thoracic cavity of the chest near the backbone and on either side of the heart. They are the pair of large, spongy organs, mainly involved in the exchange of gases between the blood and the air. Compared to the left lung, the right lung is quite bigger and heavier.
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