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Algae -plantlike protists, Screen Shot 2021-01-20 at 11.20.15 PM, Screen…
Algae -plantlike protists
dinoflagellates
plant like protists
members of the phylum pyrophyta
most are unicellular
they have 2 flagellate the right angles to one another causing them to spin
their cell wall is made of cellulose
some are photosynthetic autotrophs and others are heterotrophic
some are bioluminus,meaning they emit light
A particular type of dinoflagellates is a red tide
it is caused by algal blooms
they can be a serious threat to humans and the ecosystem
they produce a toxin, these toxins are ingested by shellfish, which are then ingested by humans
Algae
Some unicellular algae are called phytoplankton and form the base of many aquatic food webs.
Algae are plantlike protists that contain photosynthetic pigments.
Algae have chlorophyll as their photosynthetic pigment
Algae are classified based on 3 criteria's
cell wall composition
method of food storage
pigment type
Diatoms
They store food as oil, making them a nutritious food source and buoyant in water.
Diatoms are photosynthetic autotrophs that use chlorophyll and carotenoids as pigments.
Diatom cell walls are composed of silica.
Diatoms reproduce both sexually and asexually.
Asexual reproduction occurs when 2 separated halves create new half that can fit in each other therefore it produces smaller diatoms ,when the diatom reaches a certain size sexual production takes place in which the diatom will get back to its original size
they are under phylum Bacillariophyta
Chrysophytes
Phylum Chrysophyta, chrysophytes, are yellow-green or golden-brown algae
Most chrysophytes are unicellular, but some are colonial
Have carotenoids as a photosynthetic pigment
Have cell walls and store food as carbohydrates
Euglenoids
unicellular plantlike protists
Phylum Euglenophyta
they have characteristics of both plants and animals
plants:contain chloroplasts,photosynthesize their food
animals:do not have cell wall,some are heterotrophs
most live in fresh water, some live in salty waters
Green algae
Phylum Chlorophyta
Can be unicellular, multicellular, or colonial
Have cell walls and store food as carbohydrates
brown algae
phylum phaeophyta
multicellular
color comes from secondary pigment(fucoxanthin)
most live along rocky coasts in cool areas.
Haifa Alajlan, Anoud Alsudairy ,Lana Alshathri,Norah Albrahim
