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The geological time scale is divided into Eras which has the longest span which is further divided into periods and the periods are divided into Epochs. Understanding the Pre-Cambrian era and subsequent geological periods is crucial for comprehending Earth's evolutionary history, the formation of landforms, and the development of life on our planet. PRE-CAMBRIAN ERA Archeozoic Era The Archeozoic Era started 3.8K-600 million years ago . Earth was very hot & had violent volcanic Eruptions . Proterozoic Era Started 2K million Years ago (MYA) . It is also known as pre-cambrian era . The world's oldest fold mountain Aravalli belongs to the pre-cambrian era. PALEOZOIC ERA Overview Started around 600 MYA . It is divided into 6 periods . Life started originating in the pre-cambrian era. Cambrian Period This was the earliest period in which majority of the oceans were flo...

This interactive quiz contains carefully selected previous year questions on Vitamins and Nutrition, frequently asked in UPSC, State PCS, SSC, Railway and other competitive examinations. Each question includes detailed explanations to strengthen conceptual clarity. Vitamins and Nutrition - Previous Year Questions 1. Which of the following foods will provide the nutrient for the growth of new tissues in the human body? R.A.S./R.T.S.(Pre) 2003 (a) Fruit (b) Vegetables (c) Cheese (d) Sweets Explanation: Proteins are major components of human body and are more important for growth and repair of tissues. Its main sources are pulses, soyabeans, groundnut, milk, cheese, eggs, food-grains etc. 2. Consider the following statements about probiotic food: I.A.S. (Pre) 2008 1. The probiotic food contains live bacteria which are considered beneficial to humans. 2. Probiotic food helps in maintaining gut flora. Which of the ...