et the assume mean A = 42

We have

A = 42, h = 5

Mean =A+h×∑f1u1N

=42+5×-7970

=42+-39570

=42-39570

= 42 - 5.643

= 36.357

2 ÷ 2 +  2

= 1 + 2

= 3

Stomata are the tiny openings present on the epidermis of leaves. We can see stomata under the light microscope. In some of the plants, stomata are present on stems and other parts of plants.  Stomata play an important role in gaseous exchange and photosynthesis. They control by transpiration rate by opening and closing.

The main functions of stomata are:

1. Gaseous exchange- Stomatal opening and closure help in the gaseous exchange between the plant and surrounding.
2. It helps in transpiration and removal of excess water in the form of water vapour.
3. Stomatal closure at night prevents water from escaping through pores.
4. It maintains the moisture balance according to weather by opening and closing.
5. Stomata facilitate carbon dioxide uptake and release of oxygen during the process of photosynthesis.

The story starts from the point where the two main characters of the story meet- Anil and the thief. The thief is the narrator of the story. The thief says that according to him, he was pretty good at stealing. Anil was watching a wrestling match when the thief approached him. Anil was a tall, lean and an easy - going man of 25. The thief had not committed any theft in the past few days as he did not get a chance. He thought that Anil would be a good man to steal things from. So he thought about getting comfortable with him. Then the thief commented on Anil that he looks like a wrestler himself. He said that to win his confidence by flattering him. 

 Briefly trace the process of German unification. Answer: In the 1800s, nationalist feelings were strong in the hearts of the middle-class Germans. They united in 1848 to create a nation-state out of the numerous German States. But the monarchy and the military got together to repress them and they gained support from the landowners of Prussia (the Junkers) too. Prussia soon became the leader of German unification movement. Its Chief Minister Otto von Bismarck was the architect of the process with support from Prussian army and Prussian bureaucracy. The unification process was completed after Prussia won wars with Austria, Denmark and France over seven years time. The new state placed a strong emphasis on modernising currency banking, legal and judicial systems in Germany. In January 1871, the Prussian king, William I, was proclaimed the German Emperor in a ceremony held at Versailles.

 The French revolutionaries took many important steps to create a sense of collective identity among the French people which were: Ideas of la patrie (the fatherland) and le citoyen (the citizen) emphasising the notion of a united community enjoying equal rights under a constitution.A new French flag, a tricolour replaced the royal standard.The Estates General was renamed the National Assembly and was elected by a group of active citizens.New hymns, oaths and martyrs commemorated in the name of the nation.A central administrative system made uniform laws for the entire nation.Internal custom duties and dues were abolished and a uniform system of weights and measures was adopted.Discouraging regional dialects and promoting French as a common language of the nation.

Giuseppe Mazzini was an Italian revolutionary, born in Genoa in 1807. He was a member of the secret society of the Carbonari. At the age of 24, he was sent into exile in 1831 for attempting a revolution in Liguria.Mazzini believed that God has intended the nations to be the natural units of mankind, So he did not want Italy to be a patchwork of small states and kingdoms.He founded underground societies named ‘Young Italy’ in Marseilles and ‘Young Europe’ in Berne, whose members were like-minded young men from Poland, France, Italy and the German States. Young Italy was a secret society formed to promote Italian unification: "One, free, independent, Republican Nation."Mazzini, an Italian nationalist was a fervent advocate of republicanism and envisioned a united, free and independent Italy.Often viewed in Italy of the time as a god-like figure, the antifascist Mazzini Society, founded in the United States in 1939 by Italian political refugees, took his name; they, like him, served Italy from exile. b. Count Camilo de Cavour: Cavour was chief minister of Sardinia-Piedmont state who led the movement to unify the regions of Italy. He was neither a revolutionary nor a Democrat. Like many other wealthy and educated members of the Italian elite, he spoke French much better than he did Italian. He engineered a careful diplomatic alliance with France, which helped Sardinia-Piedmont defeat the Austrian forces in 1859, and thereby free the northern part of Italy from the Austrian Habsburgs.Cavour's diplomacy had by this time earned him the reputation of being one of the most skilful of European statesmen.Cavour is remembered as probably the most significant figure in the Italian Risorgimento or resurgenc

ow did the rain change? What happened to Lencho’s fields? Ans: The rain was pouring down. But suddenly, a strong wind began to blow, followed by a devastating hailstorm. All the crops in Lencho's fields were destroyed.

How did the rain change? What happened to Lencho’s fields? Ans: The rain was pouring down. But suddenly, a strong wind began to blow, followed by a devastating hailstorm. All the crops in Lencho's fields were destroyed.

Why did Lencho say the raindrops were like ‘new coins’? Ans: Lencho’s crops were ready for harvest. As raindrops would have helped in getting a better harvest, resulting in more prosperity, so Lencho compared them with new coins.

Isobar is that element which differs in the chemical property but has the same physical property. So, we can say that isobars are those elements which have a different atomic number but the same mass number.  

Example:  ⁴⁰S, ⁴⁰Ar, ⁴⁰Ca. ⁴⁰Cl, and ⁴⁰K.

Atoms that have an equal number of protons but a different number of neutrons and protons are called isotopes.

Example:  ¹⁶O, ¹⁷O, and ¹⁸O.

• It was Monday. Wanda was not in her seat but nobody noticed this.

• Wanda is a quiet girl who rarely said something but no one knows why. She lived at Boggins Heights. Her feet had mud on then.

• Student thought of Wanda outside the school hours, to have fun with her but she did not come on Tuesday also.

• On Wednesday, Peggy and Maddie thought of Wanda. Both of them were very good friends. They anted to have fun with Wanda but they noticed her absence.

• Peggy was the most popular girl in her school. She was pretty, she had many pretty clothes and her hair was curly.

• Wanda’s name was considered funny in room number 13.

• Wanda had no friends, wore a faded blue clean dress. Girls surrounded her in the school yard to make fun.

• Peggy made fun of Wanda by mostly asking how many dresses she had and how many pairs of shoes.

• Wanda would answered a hundred and shoes sixty. All girls laughed at her.

• Peggy was not really cruel. She would say why Wanda had spoken of her hundred  dresses.

• Maddie felt bad that they had been bothering Wanda like that because she was also poor. She wishes Peggy to stop teasing Wanda but pictures herself in Wanda’s place.
• Maddie remembers Wanda’s pale blue and green with red dresses.

• The drawing contest was expected to be won by Peggy.

• Next day, they saw hundred sketches of dresses all over the room. All beautiful in bright colours.

• Miss Mason announced Jack Beggles won for the boys and Wanda for girls.

• Wanda was absent. The class was astonished to know that Wanda could draw. The children clapped their hands and the sketches were all beautiful and different .

• The blue and the green dress once  spoken by Wanda was identified by Peggy and Maddie. They were shocked to know her great quality of drawing.

Three digit numbers divisible by 7 are

105, 112, 119, ..., 994

This is an AP with first term (a) = 105 and common difference (d) = 7

Let an be the last term.

an = a + (n - 1)d

994 = 105 + (n - 1)(7)

7(n - 1) = 889

n - 1 = 127

n = 128

Thus, there are 128 three-digit natural numbers that are divisible by 7.

The ratio of the speed of light in a vacuum to the speed of monochromatic light in the substance of interest. Also called the absolute index of refraction it is commonly called the refractive index or index of refraction. However, those two terms are also sometimes applied without warning to the ration found when the ray emerges into the air instead of a vacuum. That ratio should be called a relative refractive index.

The ratio of the first value to the second one is about the relative refractive index of the glass. In the case of a concave surface, beams originally propagating along the main optical axis will be refracted in such a way that they will never intersect.