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Bio 1 group 8 champaca - LIVERWORTS

presentation of liverworts for Bio1 made by group 8 champaca

Viel Jalalon

on 11 November 2012

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Transcript of Bio 1 group 8 champaca - LIVERWORTS

Characteristics non-vascular plants
phylum hepatophyta
8 500 species known
1 mm to 50 mm or more
Have chlorophyll a and b as well as carotenoids and xantophylls
two types: thallose and leafy
Thallose resemble liver
grow flat on the ground
branch dichotomously
no stem-leaf structure
consist of a thallus, one large flat plate

Leafy liverwort (left) resemble mosses
bilaterally symmetric
leaf-like portion usually one-cell thick
leaves inserted at an angle to stem
leaves without costa (midvein)
leaves 2-3 rows

STRUCTURES Archegonial head produces eggs Antheridial head produces sperm Rhizoids root like structure Gemma cup where gemmae are produced gemmae are small balls of cells produced in asexual reproduction Thallus body of the plant, consists mainly of flat, leaf-like structures Habitat Liverworts grow usually in moist, shady places such as: banks of streams marshy ground
damp soil bark of trees
deep in the woods Nutrition Photosynthetic
Store food as starch Reproduction Alternation of generations
Gametophyte is dominant
Sexual reproduction depend on water for sperm needs to swim to the eggs
Archegonial and antheridial head produce gametes.
Gemmae is produced in gemma cups for asexual reproduction
Ecology Producers
Pioneer species, the first to move in a new area
reduction of erosion
retention of water in forests
consumer use
EXAMPLES Riccia fluitans Known as the crystalwort it is an aquatic liverwort. They can be found all over the world. It is a popular aquarium plant. Marchantia polymorpha Also known as the common liverwort, They are one of the largest thallose Liverworts. They have flat thalli that grow in thick clusters. Lunularia cruciata The crescent- cup liverwort, it is pale green, and has conspicuous air pores. References: http://www.aquascapingworld.com/plantpedia/full_view_plant.php?item_id=76
http://www.deanza.edu/faculty/mccauley/6a-labs-plants-01a.htm Did you know? Liverworts were used as a cure for liver ailments after the 19th century medieval dogma called the Doctrine of signatures, where the appearance of a plant was believed to offer clues to the plants use. CHAMPACA

CH03 - Colendres
CH18 - Peralta
CH23 - Jalalon
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