In honey bees, the male is haploid while the female is diploid. Haplodiploidy occurs in some insects like bees, ants and wasps. Male insects are haploid because they develop partheno-genetically from unfertilized eggs. The phenomenon is called arehenotoky. Meiosis does not occur during the formation of sperms. Females grow from fertilized eggs and are hence diploid. Queen bee picks up all the sperms from the drone during nuptial flight and stores the same in her seminal vesicle. Formation of worker bees(diploid females) and drones(haploid males) depends upon the brood cells visited by the queen. While visiting the smaller brood cells, the queen emits sperms from its seminal receptacle after laying the eggs. Males are normally fertile haploids due to development from unfertilized eggs. Occasionally diploid infertile males are also produced from heterozygous females through fertilization.

1) Paper Chromatography:

It is the simplest type of chromatography. In this method, a special type of paper called chromatographic paper or ordinary filter paper is used.

A line is drawn near the bottom edge of the paper. The paper is dipped in a solvent and taken in a beaker so that the line drawn on the paper is above the level of the solvent.

Stationary phase: Filter paper

Mobile phase: Solvent

As the solvent rises on the paper, it takes along with it the drop of the substances.

The component of the drop which is more soluble rises faster and we see various spots on the paper, each indicating a component of the mixture.

The paper is then removed from the solvent and dried.

(2) Crystallisation:

This method is based on the differences in the solubility of solids in a liquid.

The process of formation of crystals from a hot saturated solution caused by cooling is called crystallisation. It is a process in which a solution containing more of the solid component is slowly evaporated.

Pure sugar is obtained from its solution in water by the process of crystallisation.

Stress drive from Latin words 'strictus' meaning tight or narrow and 'stringere', the verb meaning to tighten. These root words reflect the internal feelings of tightness and constriction of the muscles and breathing.

Stress is often explained in terms of characteristics of the environment that are disruptive to the individual.

There are three major types of stress, viz. physical and environmental, psychological and social.

1. Physical and Environmental Stress:

Physical stresses are demands that change the state of our body. For example, disabilities, malnutrition, injury, etc.

Environmental stresses are aspects of our surroundings that are often unavoidable such as air-pollution, noise, crowding, heat, etc. They can also be catastrophic events or disasters such as fires, earthquakes or floods.

2. Psychological Stress Internal Sources of Stress:

This is stress that we generate ourselves in our minds. These are personal and unique to the person experiencing them and are internal sources of stress. Some of these are:

(a) Frustation: Results from the blocking of needs and motives by something or someone that hinders us from achieving a desired goal. There could be a number of causes of frustration such as social discrimination, inter-personal hurt, low grades in school, etc.

(b) Conflict: It may occur between two or more incompatible needs or motives. e.g., whether to study psychology or sociology.

(c) Pressure:

Spermiogenesis is the process by which haploid round spermatids complete an extraordinary series of events to become streamlined spermatozoa capable of motility. Spermiogenesis begins after spermatocytes complete 2 quick successive meiotic reductive divisions to produce haploid round spermatids.

83, Model Town, Guwahati,

Assam

Date- 08.02.2020

To

The Principal

Rangshala School,

P-569 Lake Road

Guwahati

         Sub: Applying for the post of sports teacher

Respected sir,

         I am Ajoy Sarkar, a sports enthusiast. I want to apply for the post of Sports teacher in your school.

          I came across an advertisement for the post of Sports teacher in your school. My qualification matches with all your requirements. I want to apply for this post. I have attached all the documents and certificates with the letter.

         I would be obliged if you consider me for this post.

Yours faithfully,

Ajoy Sarkar

Bio data hints

• Bio-data- (refer to the visual cue)
→ Qualifications and experience that match the job profile- e.g.- holds a Master’s degree in Physical Education, has prior experience as a sports teacher in a school.
→ References

Working Principle of Cyclotron

• A cyclotron accelerates a charged particle beam using a high frequency alternating voltage which is applied between two hollow “D”-shaped sheet metal electrodes known as the “dees” inside a vacuum chamber.
• The dees are placed face to face with a narrow gap between them, creating a cylindrical space within them for particles to move. Particles are injected into the center of this space.
• Dees are located between the poles of electromagnet which applies a static magnetic field B perpendicular to the electrode plane.
• The magnetic field causes the path of the particle to bend in a circle due to the Lorentz force perpendicular to their direction of motion.
• An alternating voltage of several thousand volts are applied between the dees. The voltage creates an oscillating electric field in the gap between the dees that accelerates the particles.
• The frequency of the voltage is set so that particles make one circuit during a single cycle of the voltage. To achieve this condition, the frequency must be set to particle’s cyclotron frequency.

Male reproductive system is located in the pelvis region. It Consists of – a pair of testis, glands, accessory ducts, external genitalia.

Testes-

• Smooth organ situated outside the abdominal cavity within a pouch called
• The ******* helps in maintaining the low temperature of the testis which is 2-2.5^O C which is below than the normal internal body temperature.
• Each testisis 4 to 5 cm in length and 2 to 3 cm in width in adults.
• Each testis contains about250 compartments called testicular lobules.
• Each testicular lobules contain one to three highly coiled seminiferous tubules, in which sperms are produced.
• The wall of each seminiferous tubuleis lined by two types of cells called male germ cells (spermatogonia) and Sertoli cells.
• The male germ cells undergo meiosis leading to sperm formation and Sertoli cells provide nutrition to the germ cells.
• The regions outside the seminiferous tubules called interstitial spaces contain small blood vessels and interstitial cells or Leydig cells.
• Leydig cells synthesize and secrete testicular hormones called androgens.

Accessory ducts-

• The male accessory ducts include rete testis, vasa efferentia, epididymis and vas deferens.
• The seminiferous tubules of the testis open into the vasa efferentia through rete testis.
• The vasa efferentia leave the testis and open into epididymis located along the posterior surface of each testis.
• The epididymis leads to vas deferens that ascends to the abdomen and loops over the urinary bladder.
• Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct.
• The urethra originates from the urinary bladder and extends through the ***** to its external opening called urethral meatus.

Accessory glands-

• The male accessory glands include paired seminalvesicles, prostate gland and paired bulbourethral glands.
• Accessory glands secrete seminal plasma which is rich in fructose, calcium and some enzymes
• Secretion of bulbourethral gland also helps in lubricating the *****.

External genitalia-

• The ***** is the male external genitalia.
• Some special tissues make up the ***** which helps in the erection of the *****.
• The enlarged end of ***** called the glans *****.
• Foreskin, a loose fold of tissue covers the glans *****.

The relations were marked with conflicts and cooperation as described below :

(i) There was dispute over Kashmir immediately after the partition. This led to a proxy war.

(ii) The Kashmir conflict did not prevent cooperation between two countries. Both cooperated to restore women abducted during partition to their original families. A dispute over sharing of river waters was resolved with the signing of Indus Waters Treaty between India and Pakistan.

(iii) A war broke out in 1965 in the Rann of Kutch and Jammu and Kashmir which ended with UN intervention. India and Pakistan had signed Tashkent Agreement which was brokered by the Soviet Union.

(iv) In 1971 another war had broken out between India and Pakistan over the question of East Pakistan, where India extended moral and material support to the freedom struggle  in Bagladesh. As a result of the war Bangladesh came into existence as a free country.

Name of School

NOTICE

Date:

Inter School Debate Competition

This is to inform the students that our school is going to organise a Inter School Debate Competition. Students who are interested in participating in this Competition can give thier names to thier respective class monitors by tomorrow.The competition will be organised in school field on Saturday.

Name

Cultural Secretary

needed to communicate effectively with people and customers. This module aims to help you improve your communication skills. Clear and concise communication is of immense importance in work and business environment as there are several parties involved. Various stakeholders, like, customers, employees, vendors, media, etc., are always sending important information to each other.

Deleted syllabus of CBSE Class 12 Hindi Core

Deleted syllabus of CBSE Class 12 Hindi Elective

Ward no 08

Adarsh Nagar

Raipur 675

05.12.2020

Dear Rahul,

Hope everything is fine at your end. And hope your preparation of boards is as well there. This is our last year in School, after our exams we would take different turns in our life. We all might be in different ways.

So, today I want to share my future plan after leaving school. Firstly, I would seek a nice college for me and as well as a residence there. I am hoping to get hostel there. I am very much excited and nervous too for the upcoming journey, but I am sure it would be a pretty experience. As you know, my one and only goal is to serve the mankind as a teacher, I would reach to any point to achieve this. Secondly, I am passionate about singing, and I strongly believe music can energise our soul, I want to learn guitar and would like to carry on my singing with my studies. I again want to participate in quiz contests, essay writing competitions, as now I am compromising those for my exams. I want to explore various new things which would enrich me. There are lots of wishes I want to fulfill. Some of those I mentioned to you.

Okay, no more now. We will have lots of talk after exams. Wish you all the best. Take love.

Yours truly,

Rakesh

"(क)निर्देश की एकता- संगठन के सभी समूहों को एक उद्देश्य के लिए एक ही तरीके से कार्य करना चाहिए| एक समूह को एक उद्देश्य की प्राप्ति के लिए एक ही नीति को अपनाना चाहिए|

(ख) समता—यह सिद्धांत कहता है की प्रबंधक को उसके अधीनस्थों के प्रति दयालुता तथा न्याय की भावना रखनी चहिये|प्रबंधक को जाति, लिंग, धर्म, राष्ट्रीयता आदि के आधार पर कभी भी अलग अलग बर्ताब नहीं करना चहिये|

(ग)  व्यवस्था— कारखाने में हर चीज़ के लिए एक समय तथा स्थान होना चाहिए इससे समय भी बचता है तथा काम प्रयास लगते है यदि ऐसा नहीं होगा तो कर्मचारीओ का ज्यादा से ज्यादा समय चीज़ो को ढूढ़ने में लगेगा जिससे उत्पादन काम होगा |

After his misadventure in the pool at the Y.M.C.A., Douglas was amidst the fear of water. He realised that his fishing trips, canoeing, swimming and boating were over. He tried his best to overcome it but the haunting fear of the water followed him everywhere. Finally he decided to engage an instructor to learn to swim and to overcome his fear. He went to the pool and practised for five days a week, an hour each day. The instructor put a belt around him and a rope was attached to the belt. The rope went through a pulley that ran an overhead cable. Douglas held one end of the rope and went back and forth across the pool. On each trip, some of the terror would seize him up. After three months, the tension began to decrease.

Piece by piece he shed the panic. He taught him to put his face under water and exhale. He also learnt how to raise his nose and inhale. This exercise was repeated hundreds of times.

Now he was able to shed part of the fear that seized him under water. He went to Lake Wentworth Triggs Island and Slamp Act Island. He swam two miles across the lake. Now he was determined and he swam on. He shouted with joy and he had conquered his fear of water.

Answer:
When Douglas realised he was sinking he was frightened out of his wits and it was then that he decided to make a big jump and come up to the surface. He thought of lying flat on water for some time and then to paddle to the edge of the pool.

You are given a red flower-bearing pea plant and a red flower-bearing snapdragon plant. How would you find the genotypes of these two plants with respect to the colour of the flower? Explain with the help of crosses. Comment upon the pattern of inheritance seen in these two plants.

answer:

A test cross is required to find out the genotype of both the plant.

The poet describes Aunt Jennifer’s tigers as ‘bright topaz denizens’ of the forest. They are fearless and ferocious in sharp contrast to their creator, Aunt Jennifer’s nervousness and timidity. Gallant and confident, they are sure of their purpose and move ahead undeterred by any kind of hindrance or obstruction.

The Governor made quite an unusual request to the Secretary of the Examinations Board. He wanted a prisoner, Evans to be examined in the prison in his cell. Evans was to appear in O-Level German examination. He was keen to get some sort of academic qualification. The Board granted permission for conducting the examination in Evan’s prison cell.

Unemployment: It is a situation where a person is ready and willing to work at the prevailing wage-rate but doesn’t get work.

Types of unemployment:

1. Rural unemployment
a. Seasonal Unemployment
b. Disguised Unemployment

2. Other types of unemployment
a. Open
b. Frictional
c. Structural
d. Cyclical

Unemployment: It is a situation where a person is ready and willing to work at the prevailing wage-rate but doesn’t get work.

Types of unemployment:

1. Rural unemployment
a. Seasonal Unemployment
b. Disguised Unemployment

2. Other types of unemployment
a. Open
b. Frictional
c. Structural
d. Cyclical