Flashcards
Angiosperms: Evolution
Flashcards do conjunto (20)
- 1What phylum is the potential ancestor of angiosperms?Gnetophyta
- 2What are some traits in common between gnetophyta and anthophyta?Strobili resemble certain inflorescences
Contain tracheids and vessel elements
No archegonia in Gnetum and Welwitschia
Pseudo double fertilization in Ephedra (no endosperm) - 3What does the morphological data suggest about the relationship between gnetophyta and anthophyta?ephedra split off first, then welwitschia and gnetum
- 4What does molecular data suggest about the relationship between gnetophyta and anthophyta?Gnetophyta split off wayyyy back.
- 5Why do we believe all angiosperms come from a common ancestor?All have closed carpels
All have 3-nucleate microgametophytes
All have true double fertilization
All have 8-nucleate megagametophyte
All have sieve tubes and companion cells in phloem
All have stamens with two pairs of pollen sacs - 6What are magnolids?Plants that can't be easily put into monocots or dicots
- 7What types of plants are put into magnolids?Herbs
some Trees and shrubs - 8Are magnolids monophyletic or polyphyletic?Polyphyletic
- 9What are the traits of magnolids?perianth with tepals
Low, variable number of tepals, stamens and carpels
Imperfect angiospermy with free carpels - 10What is the first division of angiosperms?Monoaperturate/triapturate
- 11Which group is at the base of angiosperms, and what does the acronym stand for?ANITA
Amborella
Nymphaeales
Illiciales
Trimeniaceae
Austrobaileya - 12What is the reason for the evolution of angiosperms?Pollinators
- 13Describe the evolution of traits between ANITA and other angiosperms?Intermediate floral parts to definite and decrease number of floral parts
Decrease in number of whorls
Fusion of floral parts
Inferior ovary with fused carpels
Distinct calyx and corolla
Actinomorphic to zygomorphic - 14Are Orchidaceae monocots or dicots?Monocots
- 15What is the ovary position of Orchidaceae?Epigynous
- 16What is the column of orchidaceae made from?Stamens fused with styles and stigma
- 17How many petals does Orchidaceae have?3
- 18What are the steps of fertilisation in Orchidaceae?1. Bee enters from the side of the flower
2. Bee falls in because the petal is slippery
3. Pollinia are stuck to the thorax of the bee with glue
4. Bee enters another flower and falls in. Pollination occurs. - 19Are Asteraceae monocots or dicots?Dicots
- 20What is the flower position of Asteraceae?Epigynous
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- Angiosperm: Evolution flash cards
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- Usuário eliminado · dez 2016
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- 10 dez 2016
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- Criado por Shareef Akbari · 9 dez 2016
- Copiado por Shareef Akbari · 9 dez 2016
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