commonly yes, botanicly no-its a fruit
Gem squash falls into the category of round fruited summer squashes which need to be harvested while still immature and before the rind has hardened too much. They are not frost tolerant and require temperatures of between 18C to 27C for optimum growth. The frost free growing season in Italy (where I live) is roughly between April and November. Seed can be sown directly into the ground about 2cm deep in soil that is around 15C. For an early start seed can be germinated indoors or in a tunnel. Gem squashes have similar growing requirements to cucumbers and prefer organic liquid feeds high in potassium.
I think it is a fruit
follow this procedure.. 1.Collect two onion root tips and trim so that you have about 2 mm of the very tip. 2.Soak the tips in a few drops of 1 M HCl in a watch glass for about 10 min. 3.Transfer the tips to a few drops of acetocarmine stain for about 15 min. 4.Transfer one tip to a few drops of water on a slide. Lower a cover slip onto the tip and press it down gently so that the tip squashes out to about 7 mm (1/3 inch) around. 5.Look for mitoses under high power (X40) or under oil immersion (X100) (If this fails for any reason try your other root tip)
Variety of marrow developed to be harvested when small; also known as Italian marrow, Italian squash, or zucchini.