Q. What is the Universe ?
A n s w e r. A galaxy is a huge system of billions of stars, and clouds of dust and gases. Millions of such galaxies make up the universe.

 Copper does not react with dilute acids in normal condition because copper lies at lower position in reactivity series and is considered as a noble metal.

So, if copper turning is taken in place of zinc granules, no reaction will take place.

Pepsinogen is a digestive enzyme that helps in the digestion of proteins. Enzyme pepsinogen is converted to pepsin and then the proteins are converted into amino acids. The hydrochloric acid secreted in the stomach activates the pepsinogen enzyme required to digest proteins.

The first person to write a scientific account of electric effects was Sir William Gilbert(1504-1603). Gilbert's experiments led to a number of investigations by many pioneers in the development of electricity technology over the next 350 years.

He put forward the name electrica for substances like amber (yellow resinous substance found on the shores of the Baltic sea) which when suitably rubbed attracts light bodies.

It is the ancient Greeks who have observed that amber when rubbed with wool acquires a property that attracts light objects to it.

It is Thales of Miletus whose scientific inquisitivenss is said to have known amber and its property.(600 BC)

An American scientist Benjamin Franklin is known as the father of electricity(1706-1790).He performed the experiment of flying kite during a thunderstorm which led to the finding that lighting ang electricity is related which led to the invention of lightening rods.

Later in 1800, Italian-born physicist Alessandro Volta constructed the voltaic pile,
later known as the electric battery, the first device to produce a steady electric current.He found that certain chemical reactions could produce electricity.

The credit for generating electric current on a practical scale goes to the famous English scientist, Michael Faraday.He found out that electricity could be produced through magnetism by motion.

Thomas Alva Edison invented the practical incandescent light bulb

राज्यसभा संसद का ऊपरी सदन कहा जाता है. बता दें कि भारतीय संविधान के अनुच्छेद 80 के मुताबिक राज्यसभा में सदस्यों की अधिकतम संख्या 250 निर्धारित की गई है. इनमें से 12 वो सदस्य होते हैं जिन्हें स्वयं भारत के राष्ट्रपति मनोनीत या नामित करते हैं. इसके अलावा बाकी बचे 238 सदस्य संघ और राज्य के प्रतिनिधि चुनते हैं.

Waste disposal means removing, discarding, recycling or destroying unwanted materials called waste that is produced from agriculture, domestic usage or industrial products. Following the correct methods for waste disposal will ensure lesser pollution and hazards for the environment. Proper waste management is necessary with steps involving proper collection of waste and scientific treatments that may contribute less to water pollution, soil pollution and air pollution.

Wastes can be of numerous types and much of the waste generated today is non-biodegradable waste. Globalization and industrialization have contributed to this hugely. The dumps with harmful substances in the waste can release toxic fumes and smoke. Therefore, the correct disposal for the particular kind of wastes is necessary, for example burning all kinds of wastes may lead to the above problem and cause harm to bodies. Also, dumping into rivers and filling land depressions without proper administration is not encouraged. Wastes including plastics, batteries, sanitary and oil products should be properly disposed of. Doing so may result in a hazardous environment and polluted atmosphere. 

Methods of Waste Disposal 

The various methods of waste disposal known are as follows:

1. Landfill

2. Incineration

3. Biogas Generation

4. Composting

5. Waste compaction

6. Vermicomposting

Since we have given that

First we will find the zeroes of the quadratic polynomial.

We will use "Split the middle terms":

Now, Let, 

Now, we will verify the relationship between the zeroes and coefficient.

Sum of zeroes is given by

Hence, verified.

Roots of quadratic polynomials are 

संयुक्त राष्ट्र के लिए काम कर रहे वैज्ञानिकों का कहना है कि उन्होंने पशुओं में प्लेग जैसी बीमारी के लिए ज़िम्मेदार ‘रिंडरपेस्ट’ के जीवाणु को दुनिया से ख़त्म कर दिया है.

‘रिंडरपेस्ट’ नामक बीमारी ने एक समय में मध्यपूर्व, अफ्रीका और एशिया में महामारी का रुप ले लिया था. इसके कारण हज़ारों की संख्या में दुधारू पशुओं की मौत हो गई थी.

उम्मीद जताई जा रही है कि 'स्मॉलपॉक्स' के बाद ‘रिंडरपेस्ट’ दूसरी ऐसी बीमारी है जिसके जीवाणु को खत्म करने में इंसान ने कामयाबी पाई है.

He was a devot disciple of Mahatma Gandhi who lead the Civil Disobedience movement in Peshawar.

Ghaffar Khan forged a close, spiritual, and uninhibited friendship with Mahatma Gandhi, the pioneer of non-violent mass civil disobedience in India. The two had a deep admiration towards each other and worked together closely till 1947.

On April 23, 1930, Ghaffar Khan was arrested during protests arising out of the Salt Satyagraha.

 He was closely identified with Gandhi because of his non-violence principles and he is known in India as the 'Frontier Gandhi'.

Micropropagation is the artificial process of producing plants vegetatively through tissue culture or cell culture techniques. In this artificial process of propagation, plants are produced invitro by asexual means of reproduction or by vegetative propagation.

Plants can be produced both asexually i.e, via vegetative parts’ multiplication or sexually i.e., seed production. One of the means of asexual reproduction is by multiplying genetic replicas of plants that are referred to as clonal propagation wherein plants can be populated from a single individual through asexual means of reproduction.

For the in vivo propagation of specific plants, asexual reproduction via multiplication of vegetative parts is the only resort since they do not generate functional seeds as seen in figs, grapes, bananas etc. Successful application of clonal propagation to the following is observed: potato, apple and many other ornamental plants.

• Respiratory system is responsible for the process of respiration. It involves exchange of gases, i.e, oxygen and carbon dioxide between body and surrounding. The body can't store oxygen, so, it is vital process and it is occurs all the time.
• The body takes up oxygen and passes it to whole body through blood.
• Respiratory system is divided into 2 major parts, upper respiratory tract and lower respiratory tract.  
• Upper respiratory tract is composed of nose, pharynx and larynx.

Nasal cavity traps the dust particles.  Air passes to lungs through pharynx, and larynx is essential for speech

• Lower respiratory tract is composed of the trachea, the lungs, and bronchioles including alveoli.
• Trachea is the main pathway to lungs.  Lungs are main site of gaseous exchange, they gives oxygen to capillaries and exhale carbon dioxide, Bronchi supply the lungs with air.  Bronchioles are the branches of bronchus.  They further branches into primary and secondary bronchioles.  And they finally terminate into alveoli.  Diaphragm contracts and relaxes to allow air into the lungs.

The population of tiger decreases and the population of grass increases

Deer is a food for the tiger. If all the deer populations from the forest are removed , then there will be no sufficient food available to the tigers. Some of the tigers will die due to starvation and their population will decrease. This will disturb the food chain in which tigers operate. The hungry tigers can come out of the forest in search of food and may kill domestic animals or human beings. Since the deer are herbivorous, there absence will increase the grassland area also. This on the whole will disturb the balance of ecosystem.