Plants use direct environmental stimuli for orientation in growth and movement. This is called tropism. The responses of the plant may be toward (positive) or away (negative) from the external stimulus or stimuli.Click the links below to learn more about the different types of stimuli and the plants reaction to it:Phototropism-Reaction to light and different wavelengths.his is called tropism. The responses of the plant may be toward (positive) or away (negative) from the external stimulus or stimuli. Click the links below to learn more about the different types of stimuli and the plants reaction to it:
I'm thinking about training for a marathon. A marathon is 26.2 miles or 42 kilometers. Although some marathons differ in their terrain (some are very flat, some are extremely hilly) and degree of difficulty, the distance is always 26.2 miles.
The official distance of a half marathon is exactly 13.1094 miles. For those who prefer the metric equivalent it is 21.0975 Km. So, as you start to make your plans, the focus should be on being able to run 13 miles or 21 kilometres. The extra little distance will take care of itself.he half marathon is an endurance race as it is over a long distance so stamina and then speed will always determine your best time. The fitter that you can become at running long distances then the better chance you will have of improving times. Age is also important.