Multiple choice The skeleton of the leaf blade is formed by Petiole Veins Arteries Stipules Reveal answer Fill a bubble to check yourself B Correct answer Explanation Veins (vascular bundles) form the leaf's skeleton, providing structural support and conducting water, minerals, and sugars. Petiole is the leaf stalk. Arteries are animal blood vessels. Stipules are small outgrowths at the leaf base.