Tag: How to Questions
When does apple scab occur? Apple scab occurs when an apple tree falls victim to a fungus called Venturia Inaequalis, a malignant growth which slowly eats away the leaves …
When do plants breathe? As we know, plants produce their own food during the day by a process called photosynthesis. During this process they release more oxygen into the …
When was tea first grown? The cultivation of tea is believed to have begun in the province of Szechwan in China in around the year 350. From there its …
When was the FBI set up? FBI stands for the Federal Bureau of Investigation and was founded in 1908 within the Unites States department of Justice. Its headquarters are …
When was the hamburger invented? As the name suggests, Hamburg in Germany gave its name to this cake of minced meat cooked on a grill or a hot plate. …
When were tinned foods invented? In 1810, Nicholas Appert of France, invented a way of sterilising food in tin cans to keep for a long time. This invention relieved …
When were traffic lights invented? The purpose of traffic lights is to control the flow of traffic, determine the right way of intersections and give greater safety to drivers. …
When was the parachute invented? A parachute is a device which is designed to reduce the speed of fall. Leonardo da Vinci was the first person who designed the …
