What are the 2 classes which 97% of all angiosperms belong to?
- Eudicotyledons (eudicots)
- Monocotyledons (monocots)
- Monocotyledons (monocots)
Tags: angiosperms, classes
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When did angiosperms first appear? When did they become ecologically dominant?
First appeared c. 130 million years ago, during the Cretaceous period. Became dominant by 90 mya.
Tags: angiosperms, cretaceous
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What are the characteristics of monocots (in terms of flowers, leaves, vascular bundles, pollen, and seeds)?
Flowers: Petals occur in multiples of 3
Leaves: Parallel venation
Vascular bundles: scattered throughout stem
Pollen: one pore, furrow
Seeds: 1 cotyledon (hence, the mono)
Leaves: Parallel venation
Vascular bundles: scattered throughout stem
Pollen: one pore, furrow
Seeds: 1 cotyledon (hence, the mono)
Tags: angiosperms, characteristics, monocots
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What are the characteristics of dicots (in terms of flowers, leaves, vascular bundles, pollen, and seeds)?
Flowers: petals occur in multiples of 4 or 5
Leaves: Netlike venation
Vascular bundles: in ring around stem
Pollen: 3 pores or furrows
Seeds: 2 cotyledons
Leaves: Netlike venation
Vascular bundles: in ring around stem
Pollen: 3 pores or furrows
Seeds: 2 cotyledons
Tags: angiosperms, characteristics, dicots
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Describe the angiosperm life cycle (1 - 5).
1. Microsporangia in anthers produce pollen (microspores) by meoisis.
2. Microspores germinate, form 3-nucleate microgametophytes with 2 sperm cells.
3. Megasporangia in ovules produce megaspores by meoisis.
4. Megaspores develop into 8-nucleate megagametophytes with 1 egg cell.
5. Double fertilization produces an embryo in a seed (from ovule) in a fruit (from ovary)
2. Microspores germinate, form 3-nucleate microgametophytes with 2 sperm cells.
3. Megasporangia in ovules produce megaspores by meoisis.
4. Megaspores develop into 8-nucleate megagametophytes with 1 egg cell.
5. Double fertilization produces an embryo in a seed (from ovule) in a fruit (from ovary)
Tags: angiosperms, life cycles, megaspores, microspores
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Describe 3 characteristics of an angiosperm seed.
1. Seed coat is from integuments of maternal sporophyte
2. Nutrition for embryo from 3N endosperms.
3. Endosperm absorbed into 1 or 2 cotyledons.
2. Nutrition for embryo from 3N endosperms.
3. Endosperm absorbed into 1 or 2 cotyledons.
Tags: angiosperms, cotyledons, integuments, seed coat, seeds
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Kartensatzinfo:
Autor: zeestree
Oberthema: Medicine
Thema: Angiosperms
Schule / Uni: University of Hawaii at Manoa
Ort: Honolulu
Veröffentlicht: 19.04.2010
Tags: Angiosperms
Schlagwörter Karten:
Alle Karten (6)
angiosperms (6)
characteristics (2)
classes (1)
cotyledons (1)
cretaceous (1)
dicots (1)
integuments (1)
life cycles (1)
megaspores (1)
microspores (1)
monocots (1)
seed coat (1)
seeds (1)
