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Questions and Answers
What are microphylls?
Leaves with a single unbranched vein and in which the leaf trace is not associated with a leaf gap.
What does the enation theory suggest?
Plants with microphylls evolved from more primitive plants with green leafless stems and a protostelic core.
What are macrophylls?
Leaves that have a complex system of branching veins and leaf traces associated with leaf gaps in the stele of the stem.
What is the telome theory?
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What happens during the overtopping phase in telome theory?
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What is planation in the context of telome theory?
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What does webbing refer to in plant development?
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Study Notes
Microphylls
- Defined as leaves featuring a single unbranched vein.
- Lack a leaf gap association with the leaf trace.
Enation Theory
- Proposes that microphylls originated from primitive plants with green, leafless stems.
- Characteristics included a protostelic core of vascular tissue.
Macrophylls
- Possess a complex network of branching veins.
- Leaf traces are associated with leaf gaps within the stem's stele.
Telome Theory
- Macrophylls are thought to have developed from basic green, 3D dichotomizing branch systems.
- Emphasizes an evolutionary transition from simpler structures to more complex forms.
Overtopping
- The initial stage in the telome theory of macrophyll evolution.
- Features unequal growth between sister branches, leading to one branch becoming the main axis while the other is reduced to a lateral position.
Planation
- The second stage in the telome theory.
- Involves the restriction of 3D branching into a two-dimensional plane, causing flattening and alignment in one direction.
Webbing
- Describes the fusion of forking divisions of lateral branches through the growth of parenchymatous tissue.
- Represents a structural adaptation as part of the evolution of macrophylls.
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Description
Explore the fascinating world of plant leaves in this quiz, focusing on the differences between microphylls and macrophylls. Understand theories such as Enation and Telome, and the evolutionary processes leading to complex leaf structures. Test your knowledge on these key botanical concepts!
