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.
FOR MANY INDIVIDUALS, five kilometers (5,000 meters, or 3.1 miles) is the first competitive distance they try. It's their first race T-shirt, their introduction to the world of road racing. But experienced runners like 5-K's too. Five-K races are fun to run and easy to race. Unlike marathons, you don't need to spend 18 weeks training specifically for them, and recovery time is measured in days, not weeks. For that reason, the 5-K is the most popular racing distance in the United States.