The basic requirements for plants to survive are
-oxygen
-carbon dioxide
-nitrogen
-carotenoids
-nutrients
-water
-auxin
-sunlight
-chlorophyll

The basic requirements of plants to survive are air or known as carbon dioxide, plants uses carbon dioxide to make food, then they release oxygen as a result, they also need nutrients, nutrients come from the soil or fertilizers, nutrients acts as vitamins for plants. Plants also need water to survive, water is used in the photosynthesis process and also promotes growth of both the stem and the leaves. They also need Sunlight, plants need sunlight to produce glucose or sugar/food during photosynthesis.

The troposphere gets warmer as altitude increases.