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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: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter8: Photosynthesis
Section: Chapter Questions
Problem 13TYK: Discuss Concepts Like other accessory pigments, the carotenoids extend the range of wavelengths...
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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?

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.
Transcribed Image Text: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)
Transcribed Image Text: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)
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