In plants proline is preferentially produced from ornithine under normal conditions. However, under stress it is made directly from 

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#Question id: 19286

#Unit 9. Diversity of Life Forms

scale of ovulate (ovule-bearing) pinecone 

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#Question id: 19287

#Unit 9. Diversity of Life Forms

Integument of pine seed 

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#Question id: 19288

#Unit 9. Diversity of Life Forms

Egg cell in the embryo sac

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#Question id: 19289

#Unit 9. Diversity of Life Forms

Megasporangium of pine ovules 

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#Question id: 19290

#Unit 9. Diversity of Life Forms

If one were to erect a new taxon of plants that included all plants that are pollinated by animals, and only plants that are pollinated by animals, then this new taxon would be 

TLS Online TPP Program

#Question id: 19291

#Unit 9. Diversity of Life Forms

Reptilian embryos are protected from desiccation by a leathery shell. Similarly, which pair of structures protects seed plantsʹ embryos and male gametophytes, respectively, from desiccation?