Yes, they are edible.
Most gourds that I am familiar with are from a different genus - Lagenaria. In that case they will not cross with each other. Some decorative gourds are in the genus Cucurbita and will cross. The result may then not be very edible if the gourd dominates. You will get a mixture. If they are edible, it would be when the fruit are very small.
Gourds are edible, about like a squash.
Maracas are not edible. They are made from dried and treated hollowed out gourds containing pebbles or beans.
There are many types of edible gourds. Names of them include squash (and several various varieties of it) and Fairytale Pumpkin.
Gourds have many purposes. They can be used for decorations and can be carved to make spoons, ladles and cups. Some can be pickled and eaten.
Ornamental peppers are edible, but they are often grown for their decorative appearance rather than for consumption.
It all depends if you are talking about the decorative sunflower, or the flower that bears the edible seeds. The decorative flower can be about 25 cm in diameter, and the sunflower with the edible seeds almost twice that.
The decorative food item is spelled edible arrangement.
Decorative peppers are edible, but they are often grown for their ornamental value rather than for consumption. They can be eaten, but they are typically very hot and not as flavorful as other varieties of peppers grown specifically for eating.
No, by the usual definition, a gourd is member of the Cucurbitaceae family that is grown for decoration or for using its dried shell in some useful way. The edible members of this family are known as cucumbers, melons , pumpkins and squash.
Bananas, strawberries, grapes and Oranges are the edible fruits. There are many different fruits including the ones listed above. Fruits are usually anything sweet with seeds, excluding gourds such as zuchinnis and cucumbers. Tomatoes are also fruits.
Poppies are a decorative flower, and they are also a source of opium, and of edible poppy seeds.