What part of the plant makes seeds that grow new plants?
The part that makes new plants is the flower but it is the ovary that makes
seeds for the plant . These seeds are called ovules .
You have to plant seeds. at first they can only plant a few, like lettuce seeds. as they gain skill looking after them they can plant different types of seeds. the seeds can be found on the ground or there should be some in your inventory. You will have to make sure you keep tending the plants or they will die.
There are a variety of things you can grow in Minecraft. To grow crops, use a hoe to till land but you need to make sure there is a water source nearby or it will not be moisturizer and will grow very slowly. You can plant seeds/pumpkin seeds/melon seeds/carrots/potatoes. To grow trees, plant a sapling and it will eventually change into a tree. You can use bonemeal to accelerate the growth of plants.