The parts of a flower for grade 3 include:

1. Petals: These are the colorful, leaf-like structures that surround the center of the flower. They attract pollinators like bees and butterflies.

2. Sepals: These are the small, green leaf-like structures that protect the flower bud before it opens.

3. Stamen: This is the male reproductive part of the flower. It consists of the filament (a long, thin stalk) and the anther (a sac-like structure at the top of the filament). The anther produces pollen.

4. Pistil: This is the female reproductive part of the flower. It consists of the stigma (the sticky, top part), the style (a long, slender tube), and the ovary (the swollen base). The ovary contains the ovules, which will develop into seeds if fertilized.

5. Stigma: This is the sticky, top part of the pistil. It receives pollen during pollination.

6. Style: This is the long, slender tube that connects the stigma to the ovary. It allows the pollen to travel down to the ovary.

7. Ovary: This is the swollen base of the pistil. It contains the ovules, which will develop into seeds if fertilized.

8. Ovules: These are the structures inside the ovary that will develop into seeds if fertilized by pollen.

9. Receptacle: This is the base of the flower where all the other parts are attached.

It’s important to note that not all flowers have all of these parts. Some flowers may lack certain parts or have modified versions of them.