what vegetables can you eat without killing the whole plant?!
Answers:
Any of the vegetables that are actually fruit, such as tomatoes, courgettes (zucchini), marrows (the most commonly eaten squash in the UK) and other squash. Rhubarb is a vegetable usually eaten as a fruit and taking the stems does not kill the plant, as long as you leave a few. With many vegetables where you pick the leaves, this will not kill the plant. Examples include spinach, Swiss chard and good king Henry. Brussels sprouts are flower buds and harvesting them does not kill the plant. Beans, pulses and nuts are all parts of plants that are not essential to the survival of the parent plant, though you are eating plant foetuses!
Every single vegetable I can think of EXCEPT root veg (potatoes, carrots, parsnips, swedes, turnips... oh, and onions and leeks). Most leafy veg will actually grow back MORE when you harvest them. And the fruits of any plant can be taken without harming the plant itself (tomatoes, peppers, pumpkins, courgettes, cucumbers, beans etc.)
A lot of veg plants are annuals though, which means they only live one year anyway and you have to resow the next year. Veg plants that live year after year (in the UK) include asparagus, artichokes, Jerusalem artichokes, some herbs... not many at all.
Peppers, eggplant, cucumbers, tomatoes, corn, zucchini, squash......
Corn
Legumes
Pumpkins
Peas, peppers and brussel spouts.