Question

multiple choice question
in some plants, the seed coat is tough and contains ______ while in plants like corn, the seed coat is thin.
o xylem fibers
o sclereids
o guard cells
o chitin

Explanation:

• Xylem fibers are part of the xylem tissue (involved in water and mineral transport), not typically in seed coats.
• Sclereids are a type of sclerenchyma cell. Sclerenchyma cells have thick secondary cell walls and provide mechanical support and protection. Seed coats that are tough often have sclereids.
• Guard cells are associated with stomata (for gas exchange in leaves), not seed coats.
• Chitin is found in fungi cell walls and arthropod exoskeletons, not in plant seed coats.

Answer:

sclereids