leaf anatomy

1. a plant tissue characterized by large air spaces within its cells, allowing for efficient gas exchange
3. the central vein that runs along the length of the leaf blade
5. a waxy film that protects the outer layer of leaves, stems, flowers, and fruits
7. the stalk-like structure that attaches the leaf blade to the stem of a plant
9. plants that have adapted to survive in dry environments with little water
11. the tip of the leaf blade
12. the lowermost part of the leaf, where it attaches to the stem or petiole
16. a tissue layer within a leaf, located beneath the palisade mesophyll
18. the leaf's outer edge
19. a layer of elongated, tightly packed cells located directly beneath the upper epidermis of a leaf

2. a single layer of tightly packed cells that acts as the innermost layer of the cortex
4. microscopic pores on the surface of leaves that allow plants to exchange gases and water with the atmosphere
6. the outermost layer of cells that covers the entire surface, acting as a protective barrier
8. specialized cells found on the epidermis of a leaf that surround tiny pores called stomata
10. a layer of tissue in plants that provides mechanical support and transports water and nutrients
13. Hydrophytes are aquatic plants that are especially suited for living in aquatic environments
14. originate from parenchyma cells that differentiate into radially branched, lignified structure
15. a small, leaf-like appendage that grows at the base of a leaf's petiole
17. vascular tissue that transport water, nutrients, and sugars throughout a leaf