Which of the following regarding the two leaf types (microphylls and megaphylls) is false? Microphylls arose from small sterile sporangia. Megaphylls arose from the flattening of a dichotomous branching system. The first megaphylls arose in the Devonian period. Lycophytes are living examples of plants with microphylls. Both microphylls and megaphylls have stomata.
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Leaves are photosynthetic organs found on the sporophytes of most extant vascular plants. Based on a combination of molecular data and fossil evidence, it appears that leaves have evolved more than once. Using the information in Figure 29.13 (p. 629 of your textbook), explain leaf evolution in the vascular plants by answering the following questions. a. Lycophyta are a clade of vascular plants that have leaves called microphylls. Do microphylls represent a synapomorphy or a homoplasy in the Lycophyta? You must explain your answer. b. Megaphylls are found in Monilophyta, the ferns and fern allies, as well as Seed Plants, the gymnosperms and angiosperms. Do megaphylls represent a synapomorphy or a homoplasy in the Monilophyta and Seed Plants? You must explain your answer. Microphyll leaves Microphylls Unbranched vascular tissue Selaginella kraussiana (Krauss's spikemoss) Megaphyll leaves Megaphylls Branched vascular tissue Hymenophyllum tunbrigense (Tunbridge filmy fern)
Adi S.
Which of the following is not generally thought to be accurate with respect to the evolution of leaves? a. Leaves arose more than once during land-plant evolution. b. Microphylls may have arisen as modifications of the main vertical stem. c. Megaphylls may have come about as modifications of stem branches. d. The evolution of higher-density leaf venation correlates with increased capacity for photosynthesis. e. Only macrophyll-type leaves, which have stomata and a network of veins, are observed in extant plant species.
How do microphylls differ from megaphylls? Each microphyll has only a single vascular strand, while megaphylls have more than one vascular strand. Microphylls are found only in nonvascular plants, while megaphylls are found only in seedless vascular plants. Microphylls are defined as all leaves less than 1 cm in length; megaphylls are defined as all leaves greater than 1 cm in length. Microphylls are found only in seedless vascular plants, while megaphylls are found only in nonvascular plants. Microphylls are found on most living vascular plants; megaphylls were mostly found on the very tall seedless vascular plants that are now extinct.
Sri K.
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