Vaccination is a process in which vaccine is given to improve the immunity of the body against a specific disease. Vaccine is a biological preparation that resembles a disease causing microbe. These vaccines are made up of dead or very weak microbes.

17(2-x)-5(x+12)/1-7x=8
34 - 17 x - 5x - 60 = 8(1 - 7x)
-22 x- 26 = 8 - 56 x
- 22x + 56 x = 8 + 26
34 x = 34
x = 34/34 = 1

Nitrogen fixation is the essential biological process and the initial stage of the nitrogen cycle. In this process, nitrogen in the atmosphere is converted into ammonia (another form of nitrogen) by certain bacterial species like Rhizobium, Azotobacter, etc. and by other natural phenomena.

Plants are the main of the sources of food. The nutrients obtained from plants are synthesized by plants using various elements which they obtain from the atmosphere as well as from the soil. This group of elements includes nitrogen as well. Plants obtain nitrogen from the soil through the process of protein synthesis. Unlike carbon dioxide and oxygen, atmospheric nitrogen cannot be obtained through stomata of leaves. Because the concentration of nitrogen gas present in the atmosphere can not be directly used by plants and also the concentration of the usable form of nitrogen in the atmosphere is very less. There are certain bacteria and some natural phenomenon which help in Nitrogen fixation.

Jupiter is the largest planet in the solar system. Fittingly, it was named after the king of the gods in Roman mythology. In a similar manner, the ancient Greeks named the planet after Zeus, the king of the Greek pantheon. The planet Jupiter now has a total of 79 identified moons. More than 400 years after Galileo Galilei discovered the first of Jupiter's moons, astronomers have found a dozen more — including one they've dubbed "oddball" — orbiting the planet. That brings the total number of Jovian moons to 79.

By using the energy of sunlight, plants can convert carbon dioxide and water into carbohydrates and oxygen in a process called photosynthesis. As photosynthesis requires sunlight, this process only happens during the day. The green leaves of plants carry out both photosynthesis (in light) and respiration (all the time). Photosynthesis uses carbon dioxide to make sugar and produces oxygen as a byproduct. Respiration uses oxygen to release energy from stored sugar and produces carbon dioxide as a byproduct. All plants produce oxygen from the breakdown of water thanks to chlorophyll. The remaining protons and electrons are used for the production of sugars. These sugars are then converted into whatever the plant needs.

The crops which are sown in rainy season are called kharif crops. The growing of kharif crops starts in June-July at the beginning of south-west monsoon because these crops need substantial amount of water. Examples of kharif crops are paddy, maize, millet, soyabean, groundnut and cotton. Such crops are also called summer crops. Kharif crops, monsoon crops or autumn crops are domesticated plants like rice that are cultivated and harvested in India, Bangladesh during the Indian subcontinent's monsoon season, which lasts from June to November depending on the area. ... Rice,maize, sorghum and cotton are the major kharif crops in India.

The kharif crops include rice, maize,sorghum, pearl millet/bajra, finger millet/ragi (cereals), arhar (pulses),soyabean, groundnut (oilseeds), cottonetc. The rabi crops include wheat,barley, oats (cereals),chick pea, lentil (pulses), linseed, mustard (oilseeds). Kharif crops, monsoon crops or autumn crops are domesticated plants like rice that are cultivated and harvested in India, Bangladesh during the Indian subcontinent's monsoon season, which lasts from June to November depending on the area. ... Rice,maize, sorghum and cotton are the major kharif crops in India.a

Tense is the time described by a verb, shown by its grammatical form. There are two main tenses in English: Present tense: things that are true when the words are spoken or written. Example: She goes to school. In this sentence, goes shows that it is a present tense. There are three main verb tenses in English: present, past and future. The present, past and future tenses are divided into four aspects: the simple, progressive, perfect and perfect progressive. Tenses identification mainly based on verb form . There are 3 form of a principal verb - present, past and past participle and you have to know about auxiliary verb means be verb such as am , is , are , was, were , has , have . Sometimes auxiliary verb play the role of main or principal verb.

The resources which are used by mankind from the starting of human life. Our ancestors used these resources for lighting purposes, transportation, shelter, cooking, heating, protection from wild animals, etc. Renewable resources are also called as ‘Non-Conventional’ sources of energy.

Few examples of renewable resources are sun, wind, tidal energy, forests, mountains, soil, water bodies, animals and wildlife resources, atmospheric resources and lot more.

• We know that the largest 3 digit number is 999. 
• 998001 is the square of 999

Candles produce light by releasing heat. A candle flame consists of three zones. Each zone has different temperatures and colors.

• The first zone is called the Outer zone
• The second zone is called the Middle zone
• The third zone is called the Inner zone

The outer zone is blue in color, due to complete combustion,. This zone is the hottest zone.

The middle one is in yellow color, which is the bright part of the flame. It is moderately hot and partial combustion of fuel takes place.

The least hot region of the flame is the innermost zone. This inner zone is black in color due to the presence of unburnt wax vapors.

• All materials available in our environment which satisfy our needs are called as Resources.
• All resources have some value. Value means worth. Some resources have economic value and some do not, but both are important and satisfy human needs.
• Some resources can become economically valuable with time.

When classified by chemical structure, there are two generally recognized classes of plastic materials: Thermosets, having cross-linked molecular chains, and Thermoplastics, which are made up of linear molecular chains. Thermoset polymers require a two-stage polymerization process.  A term for thermoplastic optical materials; that is, those in which the polymer chains remain linear after heating and molding and which thus can be remolded again and again, unlike thermoset plastics, which cannot be remolded.