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.
Marathon runners can average 8.8mph for 26.2 miles. Best I can tell and would have to agree is the average human jogs at about 8mph, of course distance is the great variable. There is a range in between walking speed 4-5kmh/h and 100m record sprinting 37.58km/h (Usain Bolt 2009). Generally for longer distances average speeds are half those of professionals, so for a marathon 2 hours becomes 4 hours or 10.5km/h.