Corn and rice are gramineous food crops. The main edible part of fruit after hulling is endosperm (and some embryos). The main nutrients are starch (especially high starch), protein, fat and crude fiber. The flower is spikelet-shaped, terminal, spike-shaped, self-pollinated and wind-pollinated, and the fruit is caryopsis, which consists of glume, glume, embryo and endosperm. Monocotyledon with linear lanceolate leaves and hollow jointed stems.

Wax gourd, watermelon and cucumber belong to Cucurbitaceae, and the main edible parts are melon skin and seeds (both cucumber seeds and melon skin can be eaten). Dioecious, axillary on the node, insect-borne flowers, fruit is fruit. Seeds are inserted into the flesh of melon and consist of seed coat and cotyledons. Watermelon is mostly used as fruit. Leaves palmate and alternate. The stem is rattan-shaped, with dense hairs and tendrils. The main nutritional components of cucumber and wax gourd are Vc, crude fiber, a small amount of protein, sugar and so on. The main nutritional components of watermelon are Vc, sugar and crude fiber.

Eggplant is a solanaceae crop, the main edible part is fruit, and the main nutritional components are Vc, crude fiber, a small amount of protein and sugar. Androgyny, axillary, pollinated by insects, the fruit is eggplant, the seed is inserted in the pulp, and it consists of seed coat and cotyledons. The plant is a shrub, the old stem is semi-lignified and the leaves are palmately shaped.