The amount of available plants (or foods that are derrived from plants, like seeds) that can be eaten by humans is vast. To begin with, you can have fruits and vegetables. Grains (like oats, wheat, and flour - all which make bread and pastas) come from a plant. Nuts (peanuts, almonds, pecans, pine nuts, brazillian nuts, hazelnuts, chesnuts, and so on) and seeds (sunflower seeds tase really good!) all are from plants. Tea leaves and coffe beens are plants. Almost every herb and many spices come from plants, and a lot of oils (canola, corn, vegetable, sunflower, ect.) are derrived from plants. Though it may seem a bit exotic, trees can be eaten in the form banana leaves. Cactus can also be eaten (the fleshy meat is actually nice and tangy as a marinade!).
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Several parts of a plant can be eaten, including roots (carrots), stems (asparagus), leaves (lettuce), flowers (cauliflower), fruits (apples), seeds (beans), and tubers (potatoes). It's important to note that not all parts of a plant are edible, and some may be toxic if consumed.
It depends entirely on the plant, but almost all plant parts are edible across the range of plant species in the world. One main exception is wood. Wood as defined by secondary xylem and/or plant stems hardened by lignin is not digestible. Young shoots of bamboo are edible, however. Although bamboo is thought of as wood, it is not true wood, but rather a member of the grass family.
All major plant parts are edible, depending. These include roots, other underground storage organs (tubers, bulbs, runners...), stems, leaves, flowers, fruits, and seeds.
Examples:
Root - carrots, sugar beet, turnip
Other underground storage organs - potato, ginger, onion, garlic
Stem - celery, lemon grass, rhubarb, asparagus
Leaf - spinach, brussels sprouts, lettuce
Flower - violet, rose, squash blossom, broccoli buds
Fruits - melon, cucumber, tomato, you know these ones
Seeds - wheat and other grains, sunflower seeds, pine nuts, peanut
Not all of these parts are edible on all plants. Some are tough, bitter, difficult to digest, or otherwise unpalatable. Others are poisonous.
There are some intersting plants in which several parts are edible. One example (I think) is celery. You can buy celery stalks (with edible leaves attached), celery root, and celery seed in the supermarket.
Yes, the "parsley" plant is an example of a plant where all parts - including the leaves, stems, and roots - are commonly consumed.
Yes, some plant ovaries are consumed by people. Fruits like apples, tomatoes, and peppers are examples of plant ovaries that are commonly eaten.
Plant thorns are sharp, pointed structures that develop from the plant's outer epidermal layer. They serve as a defense mechanism to protect the plant from herbivores and other threats. Thorns can vary in size, shape, and degree of sharpness depending on the plant species.
Plant parts containing storage tissue are productive
An edible aquatic plant named 'Kalmia' or 'kalmi' is eaten as food. also it can be sea weed most of the time