abstract coconut drupe fiber fruit hull husk nut texture corn cob kernel seed circle juice palm summer tree vector food hazel hazelnut hazelnuts nuts ripe shell snack crop garden green harvest pea pod silique veg vegetable vegetables cereal corn farm field gold golden straw wheat background textures brown cocoanut cocos nucifera De-husked Coconuts dehusked dehusking produce allium biology cell cross-section garlic leaf magnification microscope peel plant rind sativum