BISC 337 Lecture Notes - Lecture 31: Heterospory, Megaspore, Propagule

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turquoisescorpion358

23 Apr 2020

School

Simon Fraser University

Department

Department of Humanities Biological Sciences

Course

BISC 337

Professor

Aubrey Pearson

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What are the contrasts and similarities between gymnosperms and angiosperms: seed development, modes of pollen/seed dispersal, morphology, adaptation to their environments. The evolution of the seed is key to the success of these plants. Nucellus or megasporangium: 2n (previous generation) provide nourishment to both. Reconstruction of a fertile branch of e. polymorpha, showing its ovules. Late devonian plant: each ovule is overtopped by a dichotomously branched, sterile structure called a cupule, also contain free lobes of integuments with little or no fusion between lobes but curved at the top. Possible steps in the evolution of the integument: seed-like structures in a number of paleozoic plants i. e. old, hypothetical evolution of an integument from telomes (proto branches/leaves) Mar 30: why would the integument be an important evolutionary step, seed coat creates protection for the embryo, makes dormancy possible. All seed plants have an eustele: stele with discrete vascular bundles arranged as a cylinder around a central pith.

Related Questions

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BISC 337 Lecture Notes - Lecture 31: Heterospory, Megaspore, Propagule

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