Help me to ID these plants

I have different plants that I grew from seeds, but I lost track of what they are. Could you help me? Some are vegetables or fruits (watermelon is one) but others could be flower plants. Any help?

The first picture shows two plants that I am sure are fruits or vegetables.

 

In the second photo, the plant in the center with pink flowers and opposite leaves is zinnia.

 

The yellow/orange-flowered plant in the third photo is Coreopsis tinctoria.

 

The plant in the center of the fourth photo looks to me like a pepper.

 

#1 looks like two members of the Cucurbitaceae. One on the right, maybe watermelon?

 

I second the watermelon.