lecture #11- Basal Angiosperms Flashcards

1
Q

When were the earliest angiosperm fossils found?

A

130MYA

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2
Q

What are Gigantopterids?

A

They could be the common ancestor of the Angiosperms and Gnetales

  • have primitive vessels
  • Eusteles
  • thought to be a seed fern by some
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3
Q

How would Gigantopterids help Darwins mystery?

A

The abominable mystery, gigantopterids would help like the “sudden appearance of angiosperms”
-have morphological similarities but molecularly not similar

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4
Q

Did basal angiosperms have flowers?

A

No, not what we would consider flowers

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5
Q

What is a carpel?

A

The female reproductive untie of angiosperms

-derived from a leaf

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6
Q

What was characteristics about carpels when they were first invented?

A

They were imperfectly fused

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7
Q

Where are the ovaries in a carpel?

A

In the bottom part

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8
Q

What is a fruit?

A

Matured ovary that contains the seed

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9
Q

What kind of pollen did early anglos have?

A

Pollen grains with one pore

-monocolpate

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10
Q

What was the purpose of the pore of the pollen?

A

Pore is where the pollen would germinate

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11
Q

What kind of pollen do more advanced anglos have?

A

Pollen grains with 3 pores

  • tricolpate
  • 127MYA
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12
Q

What were the 2 competing hypotheses for the origin of angios based on morphology?

A
  1. Paleoherb

2. Woody Magnolid

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13
Q

What is the Paleoherb hypothesis?

A

Suggests the earliest angios were a groups of tropical flowering plants with uncomplicated flower
-mix of monocot and dicot features

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14
Q

What is a Paleoherb?

A

Polyphyletic group of non-woody basal angiosperms

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15
Q

What is the Woody Magnolid Hypothesis?

A

Suggests that early angios had a morphology similar to loving members of the the Magnolids and Lavales

  • plants had medium sized trees awith long branched leaves and large flowers
  • carpel imperfectly fused
  • was the closest hypothesis
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16
Q

What is Amborellales?

A

Oldest extant angiosperm

17
Q

How did insect pollination arise?

A

From organisms looking for food

-they don’t know that they are pollinating

18
Q

What is double fertilization?

A

2 sperm nuclei

  • one fertilizes the egg to produce a 2n zygote
  • and the other uniting with the 2 polar nuclei to form a 3n endosperm
19
Q

Whats the difference between the food reserves of a gymno and an angio?

A

gymno has n (megagametophyte tissue)

Angio has 3n (endosperm)

20
Q

What happens to the ovules in angios?

A

Ovary is enclosing ovules

21
Q

Where is the pollen produced?

A

On the Anthers

22
Q

What is the first monophyletic group in the angios?

A

Magnolids

23
Q

Why was Ceratophyllum thought to be primitive?

A

Thought because its aquatic

  • reduced simple leaves
  • flower were simple
  • actually went into the water after flowering plants developed
24
Q

Fossil vs molecular evidence of angiosperms?

A

Fossils 125MYA

Molecular 200-250MYA

25
Q

What mad angios so successful?

A

Adapted traits to resist drought and cold

  • small tough leaves
  • vessels
  • being deciduous
  • sieve tube elements
  • specialized pollination
  • seed dispersal mechanisms
  • chemical defence diversity
  • mycorrhizal relationships
26
Q

Why are flowers what they are today?

A

Selective forces for pollination, protection from predation and eventual dispersal of seeds or fruit have shaped what flowers are today