Rachis Leaflet FIGURE 6-37 Leaves of barbery (Berberis) are tough and hard. It is dificult for insects to bite into them or lay eggs in them; however, the plant must invest considerable glucose to make the secondary walls of sclerenchyma cells, and the leaves must therefore photosynthesize longer before they reach their break-even point. Stomatal crypt FIGURE 6-38 (A) Yucca leaves are excellent examples of sclerophylls; they are tough and fibrous, and the cutidle is thick. These features reduce the amount of light reaching the chlorenchyma, but plant growth is probably limited by scarcity of water rather than reduced photosynthesis. These leaves may function for 5 to 10 years or more (x15). (B) Bundles of fibers occur just interior to the epidermis, and the thick mesophyll surrounds many vascular bundles (x50). (C) Stomata occur in long, shallow grooves that run between fiber bundles (x150). (D) Even vascular bundles of these sclerophylls have fiber sheaths (x150). (E) Sdlerophylls of Dracaena are very thick and have leaf veins throughout the mesophyll, unlike the single row in ordinary leaves (x15). (F) Leaf veins of Dracaena have extremely thick -Fiber bundle Vascular bundle (A) Fiber bundles Vascular bundles (B) fiber sheaths (x150). Fiber sheath Cuticle -Phloem -Xylem Fiber sheath AStomata (D) -Xylem -Phloem -Fiber саp (E) (F)
Rachis Leaflet FIGURE 6-37 Leaves of barbery (Berberis) are tough and hard. It is dificult for insects to bite into them or lay eggs in them; however, the plant must invest considerable glucose to make the secondary walls of sclerenchyma cells, and the leaves must therefore photosynthesize longer before they reach their break-even point. Stomatal crypt FIGURE 6-38 (A) Yucca leaves are excellent examples of sclerophylls; they are tough and fibrous, and the cutidle is thick. These features reduce the amount of light reaching the chlorenchyma, but plant growth is probably limited by scarcity of water rather than reduced photosynthesis. These leaves may function for 5 to 10 years or more (x15). (B) Bundles of fibers occur just interior to the epidermis, and the thick mesophyll surrounds many vascular bundles (x50). (C) Stomata occur in long, shallow grooves that run between fiber bundles (x150). (D) Even vascular bundles of these sclerophylls have fiber sheaths (x150). (E) Sdlerophylls of Dracaena are very thick and have leaf veins throughout the mesophyll, unlike the single row in ordinary leaves (x15). (F) Leaf veins of Dracaena have extremely thick -Fiber bundle Vascular bundle (A) Fiber bundles Vascular bundles (B) fiber sheaths (x150). Fiber sheath Cuticle -Phloem -Xylem Fiber sheath AStomata (D) -Xylem -Phloem -Fiber саp (E) (F)
Biology (MindTap Course List)
11th Edition
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Chapter27: Seedless Plants
Section27.3: Seedless Vascular Plants
Problem 3C: Which of the following are parts of the sporophyte generation in ferns: frond, sperm cells, egg...
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Sclerophyllous foliage leaves like those in holly, barberry (as shown), and Yucca (as shown) have many unusual features. Do they live for 1 year or longer? They are more resistant to animals that might try to eat them. Why? What type of cells do they have that most leaves do not have?
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