solar system

 

Noun and the Number

 Number: If a Noun tells about one or more than one is called Number. 

                                 Ex- A boy , A girl , A pen , Boys , Girls ....etc.

Kinds of Number : 

1. singular Number        2. Plural Number 

1. Singular Number :- If a Noun tells about only one, it is called singular Number.

                              Ex- A student 

2. Plural Number :-  If a Noun tells about more than one it is called Plural Number. 

                             Ex- students

• Rules for changing a singular into plural number :

Rule(1) : Generally किसी  भी Noun के last में s जोड़कर Plural बनाया जाता है। 

Singular                                                           Plural

Fan                                                                   Fans 

Flat                                                                   Flats

Shirt                                                                  Shirts

Horse                                                                 Horses

Dog                                                                    Dogs

Rule(2) : यदि किसी Singular Common Noun का last letter  - s- , sh , ch , ss , x , z हो , तो es जोड़कर Plural बनाया जाता है। 

Singular                                                              Plural

Bus                                                                      Buses

Kiss                                                                     Kisses 

Match                                                                  Matches

Tax                                                                        Taxes

Malaria disease

Some of the human diseases are caused by protozoans. Plasmodium is a tiny protozoan is responsible for malaria disease. Different species of plasmodium are responsible for different type of malaria. Malaria caused by plasmodium falciparum is the most serious one and can even be fatal. Plasmodium live in a wide variety of moist habitats including fresh water, marina environment and the soil. Plasmodium enters the human body through the bite of infected female Anopheles mosquito. Then attack the red blood cells (RBCs) resulting in their rupture. The rupture of RBCs is associated with release of toxic substance, hemozoin , which is responsible for the chill and high fever recurring every three to four days.

structure and function of eye

 definition of eye :- The human is an organ that converts light into a set of electrical signals and transmits these these signals to the brain.  

Q. why do eyes of animals shine in the night ?

ans. They have a special type of reflective layer behind the pupil of their eyes known as tapetum lucidum.

cornea :-  the cornea is the outer layer at the front of the eye. transparent structure at the front of the eye. 

• The cornea helps our eye to focus light so we can see clearly.
• The cornea acts as the eye's outer most lens. controls and focuses the entry of light into the eye.
•  The cornea is shaped like a dome and bends light to help the eye focus. It is the eyes primary light focusing structure.
  
  

Anterior chamber :- Anterior chamber is the part of the eye between the cornea and the iris.

The anterior chamber is filled with a watery fluid known as the aqueous humor. anterior chamber is 3mm deep and it contains 0.25ml of the aqueous humor.

Iris :- The colored tissue in eye that contans the pupil in the center. The iris helps control the size of the pupil.

Q.  What is the function of iris in the eye ?

ans.- The iris controls the amount of light that enters the eye.

• The iris lies in front of the crystalline lens and separates the anterior chamber from the posterior chamber.

Q.  Why is iris colored ?

ans.- The color of the iris is based on the amount of pigment, or melanin.

• The more pigment present the darker the eyes.

Pupil :- The pupil is the opening in the center of the iris. Function of the pupil is to allow light to enter the eye so it can be focused on the retina . the pupils appear perfectly round and black in color.

Q . Why is pupil black ? 

ans.- The black color is because light that passes through the pupil is total abserbed by the retina and is not reflected back.  

in low light conditions -  the pupil dilates so more light can reach the retina to improve night vision.

in bright condition - the pupil constricts 

  

Generally normal pupil size in adults ranges from 2 to 4 millimeters in bright light to 4 to 8mm in the dark.

both pupils normally constrict when you focus on a near object.

Rectangular pupil - sheep, Goats , octopuses and toads 

spherical - human 

vertical slite - cats, snakes alligators and crocodiles.

मलिक मुहम्मद जायसी

 जन्म :- 1492  (अनुमानतः )

निधन :- 1548 (अनुमानतः )

निवास स्थान :- जायस (उतर प्रदेश )

पिता :- मालिक शेख ममरेज 

गुरु :- सूफी संत मोहिदी और  सैयद अशरफ 

 वृत्ति :- आरंभ में जायस में रहते हुए  किसानी,  शेष जीवन फकीरी में ,  बचपन में  ही  अनाथ 

व्यक्तित्व  :-   बायीं आँख और बायीं कान नहीं था चेचक के कारण 

कृतियाँ :- पद्मावत , अखरावट , आखिरी कलाम , 

Meaning of Debit and Credit

 The very word 'Debit' is derived from the Latin word 'debitum' which means 'due from that' or 'who owes'. But technically, to debit an account means to write on the left hand side of an account called the debit side. In short, debit refers to the left hand side an account. It increases either assets or the recorded expenditure of the organisation keeping the book. The term Debit is related to the English term 'Debtor'. Debit is written in short form as 'Dr'.

Similarly, the word 'Credit' is derived from the Latin word 'Creditum' or 'Creder' which reveals 'due to that'. But to credit an account means to write on the right hand side of account which is called the 'Credit side'. In short, it is written as Cr. Usually credit side shows sale, income or liability.

Practically, these two terms are the two sides of an account, the left hand side is called the Debit side and the right hand side is called the Credit side.

Thomson's Model of the Atom

 Thomson suggested in 1898  that the atom is a positively charged solid sphere and electrons are embedded in it in sufficient number so as to make the atom electrically neutral. One can compare Thomson's atom to a birthday cake in which cherries are embedded. This model was quite attractive as it could explain why only negatively charged particles are emitted when a metal is heated and never the positively charged particles.