The main parts of a plant are the root, the stem and the leaves.

 

The plant uses its root to attach itself in its growing environment.

The plant uses its stem to grow towards sunlight. The plant needs sunlight in order to photosynthesize. 

The leaves are where photosynthesis takes place. During photosynthesis, the plant uses the energy it gains from sunlight to produce sugar and oxygen from carbon dioxide and water. To do this, the plant must gather carbon dioxide from the air around it and use its roots to collect water from the soil. 

The plant uses sugar to grow and reproduce. 

Flowering plants reproduce via flowers. Flowers produce pollen, which is transported to another flower with the help of the wind or a pollinator (e.g. an insect). When the pollen grain of one flower fertilizes the egg cell of another flower, a seed begins to develop. The seed then grows into a new plant individual.

Sporangious plants do not have flowers. Instead, they reproduce via spores.