Puas yog Gnetum yog fossil nyob?

2024 Tus sau: Edward Hancock | [email protected]. Kawg hloov kho: 2023-12-16 01:32

Gnetales yog ib qho ntawm tsib xwb nyob pawg ntawm cov noob nroj tsuag, tab sis piv rau conifers, cycads, Ginkgo, thiab angiosperms, lawv pob txha Cov ntaub ntawv tsis zoo heev tsis nkag siab (Crane 1988).

Dhau li ntawm no, vim li cas Gnetum yog gymnosperm?

Xws li cov hlab ntsha tsim thaum cov hlwb koom nrog rau qhov kawg ntawm cov ntaub so ntswg xylem thiab muaj nyob rau hauv cov paj ntoo. Feem ntau gnetophytes tsim cov noob liab qab (pom) cov noob, zoo li lwm yam gymnosperms ua - ginkgo, cycads, thiab conifers. Gnetum leyboldii, tsis zoo li feem ntau gymnosperms ua , tsim noob nyob rau hauv ib tug muaj kua, txiv hmab txiv ntoo-mimicking txheej.

Ib yam li ntawd, 4 hom gymnosperms yog dab tsi? acid (DNA) tau pom tias cov gymnosperms muaj plaub pawg loj, muaj feem xyuam nrog: conifers, cycads, ginkgo, thiab gnetophytes.

• Conifers. Nrog rau kwv yees li 588 hom tsiaj nyob, qhov no yog qhov sib txawv tshaj plaws thiab nyob deb ntawm cov ecologically thiab kev lag luam tseem ceeb ntawm pawg gymnosperm.
• Cycads.
• Ginkgo.
• Gnetophytes.
• Cov ntawv sau cia.

Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog lub ntsiab lus ntawm Gnetum?

Lub ntsiab lus ntawm Gnetum .: ib tug genus (hom tsev neeg Gnetaceae) ntawm gymnospermous, dioecious, tropical shrubs, me me ntoo, los yog woody vines muaj compound txiv neej thiab poj niam strobili feem ntau teem nyob rau hauv pawg thiab noob zoo li drupes.

Dab tsi yog 3 piv txwv ntawm gymnosperms?

Gymnosperms yog vascular nroj tsuag Ntawm lub subkingdom Embyophyta thiab suav nrog conifers, cycads, ginkgoes, thiab gnetophytes. Qee qhov piv txwv zoo tshaj plaws ntawm cov ntoo ntoo thiab ntoo muaj xws li ntoo thuv, spruces, firs, thiab ginkgoes.