Plenty of moisture, carbohydrates and moderate temperature
room temperature
Yes.
they need heat or sunlight
Yeast needs warmth, food and moisture to grow while bacteria needs warmth, food , correct ph,oxygen, and time to grow. Moulds need warm, moist conditions and viruses need time and opportunity for the conditions to be right for them to thrive.
Yeast need warm temperatures in order to grow. The perfect temperature for yeast is about 110 degrees F. Yeast will not start to reproduce and rise without warm temperatures to activate it.
ANY plant needs SUNLIGHT to grow. we cant do without sun. Except for the creatures at the sea bottom.
try agar search google for "potato dextrose yeast agar recipe"
it needs sun light and heat
Sunlight, Water and Soil
Sugar is a necessary food source for yeast to grow and ferment. When yeast consumes sugar, it produces carbon dioxide and alcohol, which are responsible for fermentation in bread-making and alcohol production.
Yeast Grows much better in sugar water. They are micro organisms that need the sucrose in the sugar to activate and grow, without the sugar very little would happen. If you used salt water it would most likely kill the yeast.
Most bacteria will grow in dark, moist, warm areas with a neutral PH balance (ph7, water, sweat, most foods) and a source of food for the bacteria, such as sugars, and protein. All bacteria need to grow in conditions such as this is time. (And not very long, either. 4 hours on average)