Biology

2. Dense network of thin, branching roots typically found near the soil surface.
4. Process where unspecialized cells become specialized in form and function.
5. First root structure that grows downward from a germinating seed.
7. Lateral extension growing out from the main root to aid in absorption and anchorage.
9. Secondary meristem that produces outer protective layers in woody plants.
10. Living tissue formed inward by a secondary meristem as part of the outer covering.
12. Swellings on roots housing nitrogen-fixing bacteria in mutualistic relationships.
14. Waterproof band in the walls of certain cells that blocks passive flow of materials.
16. Layer of ground tissue between the outer surface and central vascular region, often used for storage.
17. Inner layer of the cortex that controls the movement of water and solutes into the vascular system.
21. Dead protective cells with suberized walls that help prevent water loss.
23. Meristematic tissue that produces additional layers of xylem and phloem.
25. Area where newly formed cells increase in length to push the root deeper into the soil.
26. Secondary protective tissue composed of cork, cork cambium, and inner supportive layers.

1. Vascular arrangement surrounding a central pith and enclosed by ground tissue.
3. Conductive system that transports water, minerals, and sugars throughout the plant.
6. Simplest vascular configuration with a solid core of conducting tissue and no central cavity.
8. Outer cell layer in roots that replaces the original outermost layer in older regions.
11. Symbiotic association between fungi and plant roots that improves nutrient absorption.
13. Thickened roots adapted to hold reserves of starch, sugars, or water.
15. Layer just inside the endodermis that can give rise to lateral roots and other structures.
18. Central vascular region in roots and stems that contains conducting tissues.
19. Roots developing from organs other than existing root structures, like stems or leaves.
20. Type of root structure featuring one main deep-growing root with smaller branches.
22. Specialized cells that form a selective barrier to substances entering the vascular tissues.
24. Embryonic structure that emerges first from a seed during germination.
25. Outer protective layer of cells covering the surface of a young root or stem.
26. Central part of a stem or root composed of parenchyma cells used mainly for storage.