Now plains have a chance to spawn bees and ruined nether portals. Villages will also spawn here. Plains are the most basic of all lands, and the easiest to obtain food due to grass ( seeds) and the spawning of farm animals, which are more abundant than in other biomes. Trees were added later in the game, then the release of ore blocks.
The plains biome was the first released biome in Minecraft and covered the entire land. They are often referred to as ecosystems. A biome is climatically and geographically defined by distinctive communities of plants, animals and soil organisms supported by similar climatic conditions. The term biome is analogous to its scientific usage on Earth. Prior to the Halloween update, every world only had a single theme which was either grassy or snowy. In the 1.14 version, two new biomes were be introduced, making it 21 biomes (without variants). Examples of biomes include the forests, jungles, deserts, and tundras. Introduced in the Halloween Update, biomes separate every generated world into different environments, paralleling the real world.