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Cell Division and Cycle

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cell division and cycle

Living organisms are constantly making new cells. They make new cells in order to grow and also to replace old dead cells. The process by which new cells are made is called cell division. Cell division is occurring all the time. Around two trillion cell divisions occur in the average human body every day!

Types of Cell Division

There are three main types of cell division: binary fission, mitosis, and meiosis. Binary fission is used by simple organisms like bacteria. More complex organisms gain new cells by either mitosis or meiosis.

Must Read: Chloroplasts – Unique Structures Found in Plant Cells

Mitosis

Mitosis is used when a cell needs to be replicated into exact copies of itself. Everything in the cell is duplicated. The two new cells have the same DNA, functions, and genetic code. The original cell is called the mother cell and the two new cells are called daughter cells.

Examples of cells that are produced through mitosis include cells in the human body for the skin, blood, and muscles.

Cell Cycle for Mitosis

Cells go through different phases called the cell cycle. The “normal” state of a cell is called the “interphase”. The genetic material is duplicated during the interphase stage of the cell. When a cell gets the signal that it is to duplicate, it will enter the first state of mitosis called the “prophase”.

  • Prophase – During this phase the chromatin condenses into chromosomes and the nuclear membrane and nucleolus break down.
  • Metaphase – During metaphase, the chromosomes line up along the middle of the cell.
  • Anaphase – During anaphase, the chromosomes separate and move to opposite sides of the cell.
  • Telephase – During telophase, the cell forms two nuclear membranes around each set of chromosomes and the chromosomes uncoil. The cell walls then pinch off and split down the middle. The two new cells, or daughter cells, are formed. The splitting of the cells is called cytokinesis or cell cleavage.

Also Read: The Skeletal System: Guards of the Body

Meiosis

Meiosis is used when it is time for the entire organism to reproduce. There are two main differences between mitosis and meiosis. First, the meiosis process has two divisions. When meiosis is complete, a single cell produces four new cells instead of just two. The second difference is that the new cells only have half the DNA of the original cell. This is important for life on Earth as it allows for new genetic combinations to occur which produces variety in life.

Examples of cells that undergo meiosis include cells used in sexual reproduction called gametes.

Diploids and Haploids

The cells produced from mitosis are called diploids because they have two complete sets of chromosomes.

The cells produced from meiosis are called haploids because they only have half the number of chromosomes as the original cell.

Binary Fission

Simple organisms such as bacteria undergo a type of cell division called binary fission. First, the DNA replicates and the cell grows to twice its normal size. Then the duplicate strands of DNA move to opposite sides of the cell. Next, the cell wall “pinches” off in the middle forming two separate cells.

Must Read:

Plant – Living Organism

The Circulatory System: Carrier of Life

Amazing Body of Facts

How to Study for Civils by Tukaram Mundhe IAS

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tukaram mundhe ias
How to Study for Civils by Sh. Tukaram Mundhe, IAS


Welcome to the world of competitive examination! You will see all the drama from failure to success, moment of and annuity, disappointment, ecstasy and much more. If you have to be one amongst successful candidate, be ready to face all these challenges.

After all successful candidates are common human beings like all of us, but with a difference. The difference being the adoption of the right strategy and correct approach for the preparation of civil services.

What are the right strategy and correct approach for the preparation of civil services?

Is It differs from the general approach followed by a majority of the aspirants? Is it really difficult to adopt such approach? All these and many more questions will naturally crop up in your mind.

It is an ideal situation to begin the preparation of civil services at the graduation level. But most of the time, it is not the case. Therefore, the best alternative is to begin the preparation of civil services immediately after the completion of graduation.
The preparation of civil services must begin one year in advance i.e.. If one contemplates writing civil service examination in 2019, preparation must begin in June 2018, “ Well begin in half done”, strategy must be followed. One must not follow the general approach of first ready general books, preparation for the preliminary examination, then for mains followed by interview. This is not an appropriate approach to follow, because this approach is disintegrated whereas the preparation of civil services must be done in an integrated manner. The objective of the preparation is to quality for IAS / IFS/ IPS and nothing else one must prepare by keeping this objective as goal. Therefore, aim should not be of qualifying preliminary or mains or getting selected, but to achieve rank which will make youIAS / IFS/ IPS and nothing else.

You must begin with the study of syllabi for both preliminary and main examination, which rarely happens, Generally, the reading of syllabi takes places and not the study of it. This is the first major mistake committed by aspirants.
The study of syllabi is an integral part of the preparation of civil service, which may be neglected at the cost of dire consequences of not getting selected.

The next step is crucial, which will determine your success or failure to a greater degree. Immediately after studying syllabi, aspirants startcollecting the list books to be referred and start reading those books. Aspirants read the number of books and are happy for doing so after reading books on many occasions, aspirant feels that he is prepared for writing the examination, which is actually an illusion.

After studying syllabi, the next logical step is to study (not read) question papers. One may take time of about twenty days for studying question papers. This is very essential because one gets an idea about the nature and types of questions asked on different topics. One can also realize, how the question is framed on different topics how to go about the preparation of civil services. This is actually the beginning of the preparation of civil services, which is either neglected or skipped by the majority of aspirants.

After studying the question papers, one must go for basic reading. The basic reading means the reading of essential books like NCERT, subject wise books. Majority of the aspirants will think only this as the preparation, which is the wrong impression. The is just another step towards preparation.

After reading the basic books, an aspirant must study the question papers topic and subtopic wise, the listing of question on topic and subtopic wise, Furthermore, one must frame the possible questions which can be asked topic/subtopic wise. this will make you understand the scope of the topic. This helps in preparation of answers for those questions, not leaving any area of the topic/subtopic.

Once this analysis is done, next step is to write the answers of those questions writing of complete answer is the key to success.

Therefore, while preparing for the examination, writing of answers is most important and most crucial task writing answer of each and every question, topic/subtopic wise, is itself preparation of notes.

What do I mean by complete answers? It means writing a well-structured answer which well encompasses all the components, which are asked for in the questions. The general tendency is to write complete information and consider it as a complete answer, which is wrong in itself. It is a partial or incomplete answer.

Writing of complete information is just one part of the answer among many parts. Naturally one gets the marks which are allocated to information part. Therefore writing of complete answers is crucial for obtaining complete marks.

For writing complete answers one must know what are the parts of answers parts of answers range from the minimum of three to maximum of seven, The simple straightforward question will have three parts and the most critical question will have seven parts of the answer. If one writes all the parts, one obtains very good marks. Therefore, strategy must be to write best answer for best marks. The best answer means the complete answer.

Once answers are written, on every topic and subtopic, revising those is essential after the preliminary examination.

Hence preparation must begin in June with the main examination. Till December, One optional ( preferably second optional ) and General Studies must be complete from mains point of view.
The preparation of preliminary examination must begin in second half of December. This preparation must also be on the same lines of main studying of question papers must be followed by basic reading. This must follow by analysis of question papers on topic wise.

The nature, type, and number of question asked on every topic must be analyzed. Your preparation must progress along these lines. So solving past question papers is an essential aspect of the preparation of the preliminary examination.

Once the preliminary examination is over. The preparation of the main examination, must being in right earnest. the preparation must begin with the optional. One must not neglect General studies. General Studies and both the optional must be ready by the time of declaration of preliminary result. After results, the revision must be done vigorously.

The strategy in the examination is to keep cool, avoiding both anxiety or distress write a minimum number of answers required. these answers must be best, which will fetch best marks. After the main examination, preparation for an interview must begin within one month. By the time results of main examination are declared, one must be ready to face interview.

If preparation is rigorous and on scientific lines, as enplaned, nothing in this world will prevent you from achieving your goal of becoming IAS / IFS/IPS

Samudra Manthan

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Samudra Manthan (C. Raja Mohan) : Invoking a tale from Hindu mythology Samudra Manthan or to churn the ocean C. Raja Mohan, head of the strategic studies programme at Observer Research Foundation in New Delhi, tells the story of a Sino-Indian rivalry spilling over from the Great Himalayas into the Indian and Pacific Oceans. He examines the prospects of mitigating the tensions and constructing a stable Indo-Pacific order.
America, the dominant power in the area, is being drawn into the unfolding Sino-Indian competition. Despite the huge differences in the current naval capabilities of China, India, and the United States, C. Raja Mohan argues that the three countries are locked in triangular struggle destined to mould the future Indo-Pacific. The book offers deep insights into the emerging Indo-Pacific theatre as the rising maritime profiles of India and China begin to intersect. C. Raja Mohan’s perceptive analysis of the US role in shaping Sino-Indian rivalry is a valuable contribution to the debate on changing great power relations in Asia and its waters.

Also, Read:

World’s 10 Greatest – Ocean or Seas, Deserts, and Mountains

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world's 10 greatest

The world’s 10 greatest Oceans and Seas

Pacific Ocean                     16,62,40,000 sq kms

Atlantic Ocean                   8,65,60,000 sq kms

Indian Ocean                     7,34,30,000 sq kms

Arctic Ocean                       1,32,30,000 sq kms

South China Sea               29,74,000 sq kms

Caribbean Sea                   27,23,000 sq kms

Mediterranean Sea         25,03,000 sq kms

Bearing Sea                        22,68,000 sq kms

Gulf of Mexico                  15,43,000 sq kms

Sea of Okhotsk                 15,27,000 sq kms

Also Read: All about earth – explained in 7 minutes

The world’s 10 greatest Deserts

Sahara Desert                    84,00,000 sq kms

Australian Desert             15,50,000 sq kms

Arabian Desert                  13,00,000 sq kms

Gobi Desert                        10,40,000 sq kms

Kalahari Desert                 5,20,000 sq kms

TaklaMakan Desert         3,20,000 sq kms

Sonoran Desert                                3,10,000sqkms

Namib Dessert                  3,10,000 sq kms

Kara Kum Dessert            2,70,000 sq kms

Thar Dessert                      2,60,000 sq kms

Also Read: Physical features of India – physiographic units

The world’s 10 Highest mountain peak

Mount Everest                  8,848 meters

K2                                           8,611 meters

Kanchenjunga                   8,597 meters

Lhotse                                  8,511 meters

Makalu                                 8,481 meters

Dhaulagiri                            8,172 meters

Manaslu                               8,156 meters

Cho Oyu                               8,183 meters

Nanga Parbat                     8,126 meters

Annapurna                         8,078 meters

Also Read: 32 Facts about Mountains

All these peaks are located in Himalayan Mountain Range.

Dr.Ruveda Salam IPS – First Women from Kashmir to Qualify UPSC Exam

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Dr.Ruveda Salam IPS

A Kashmiri who made history and really sets a great example not just for the youngsters of the valley but also for the nation. One such person is IPS officer Dr.Ruveda Salam who ranked 23rd in the Civil Services Examination. She became the first woman from the Kashmir Valley to qualify in the Union Public Service Commission examination in 2013. She cleared the Kashmir State Administrative Service Exam in 2009 before attempting UPSC Exam. But instead of pursuing a post graduation in medicine, she began pursuing Administrative Services.

Dr.Ruveda Salam, Jammu & Kashmir’s first woman IPS officer, joins the growing list of women IAS, IPS officers in India such as Kerala’s Assistant Superintendent of Police (ASP) Merin Joseph IPS and Telangana IAS officer Smita Sabharwal.

“Being a young ACP is a challenging role. It carries a lot of responsibility. I am in a state where people respect the police. When girls see me in uniform they look at me with admiration!,” Dr.Ruveda Salam says.

Read Also: Mohammad Sana Akhtar, CSE 2014 (IPS)

Family Background of Dr.Ruveda SalamDr.Ruveda Salam

Dr.Ruveda Salam comes from Farkin, a remote village in Kupwara district, Jammu & Kashmir, Salam is currently an Assistant Commissioner of Police (ACP) in Chennai. Her father is a former deputy director general of Doordarshan and her mother was also educated.

When Dr.Ruveda Salam was growing up in Kashmir, her father often used to say that she should become an IAS (Indian Administrative Service) officer. It was her father who inspired her to clear UPSC. That’s when she first thought of becoming one. It inspired her and she decided to go ahead and aim for it and that’s what made her more determined.

Dr.Ruveda Salam could fend off pressure from orthodox relatives to get married. “I am not going to blame my religion for this, but yes, Muslim girls are supposed to marry early,” Dr.Ruveda Salam says. She thanks her mother for being a buffer and fending off suggestions of early marriage as they always supported her convictions.

Dr.Ruveda Salam feels very proud of reaching such a level. Her parents too are proud about it. There is this sense of turmoil in the valley and the situation does not allow you to pursue such dreams. So being the first woman to get a rank in the UPSC from the Kashmir valley does give her a sense of pride.

Educational Background

Dr.Ruveda Salam completed her MBBS from the Government Medical College in Srinagar and joined the State Civil Services. Her parents said, “if you want to fly higher we are not going to act as a barrier”. She had already made up her mind while doing  MBBS that she would shift over to the Civil Services. Instead of doing a post graduation in medicine, she had started reading papers and preparing for the UPSC.

There was craze in Dr.Ruveda Salam’s town going around that you have to be either a doctor or an engineer. In the Kashmir valley being a doctor or an engineer was considered to be a blessing in 2003-2004. Parents forced their children to take up medicine or engineering. Her parents didn’t force her.

Dr.Ruveda Salam asked them for their advice and they asked me to follow my conviction. They asked me to first complete my MBBS and then go for it, so that in the event of not qualifying for the civil services she’d at least have a good profession to fall back on.

Read Also: Read Success Story of IPS Sarah Rizvi

Attempts

Dr.Ruveda Salam has cleared the UPSC exam for a second time and has secured a higher rank which enables her to join the coveted IAS.

Preparation Strategy

Dr.Ruveda Salam have not done any coaching. She had qualified the State Civil Services Exam without coaching, when she was on a job on probation for some time. It was not possible for her to move to Delhi or any other metropolitan city to undertake coaching. Dr.Ruveda Salam prepared for one whole year before Preliminary Exam as she got the right material. She also ordered certain books from Delhi and also took help of Internet. She was able to get the information she needed (for the UPSC exam preparation) on Facebook.

Besides that, Dr.Ruveda Salam also took guidance of some senior IAS officers in the state. She carried her study books to office and whenever time permitted she would take them out and study.

Success Mantras for UPSC Aspirants

  • Believe in your capabilities. That gives you the conviction and the perseverance required to achieve your aims.
  • Discipline is very important because you have to overcome many distractions.
  • Sticking to your plan and working towards your goal is very important if you want to achieve something in life.
  • If you are a professional or into the civil services or a farmer or doctor or lawyer or journalist, you should make efforts to contribute something the nation’s development at your own level and in whatever way you can.
  • Only through small contributions can a big change be experienced at the national level.

Don’t Miss: Dr. Shah Faesal IAS Topper from Kashmir – A Role Model for Youth