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Algae, Sara Alswaidan and Shaden Alshareef 9/C, dinoflagellates, mikrofoto…
Algae
Dinoflagellates
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Some are autotrophs, while others are heterotrophic.
Some emit light, and they are called bioluminescent
Red Tides
Some dinoflagellates have a red pigment, and they can form red tides.
Red tides are formed when there is plenty of food and nutrients and favorable conditions for the algae to reproduce very rapidly.
Red tides can be dangerous for humans and the ecosystem as they are toxic and reduce light penetration.
Diatoms
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They store food such as oil, oil is less dense than water which makes diatoms float and get closer towards the sunlight.
reproduction of diatoms:
2 separated parts creates a new part that fits the original part. After each asexual process it gets smaller (each generation gets smaller), until they reach their minimum size. They then undergo a sexual process. Then gametes are formed and one quarter of the original size fuse together and form zygotes give new diatoms with the same size.
Green Algae
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They have very much in common with plants, such as they both contain chlorophyll, they have cell walls, both are photosynthetic, and both store their food as carbohydrates.
Can be unicellular, multicellular, or colonial
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Euglenoids
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How they are similar to plantlike: They photosynthesize their food / They have chloroplast as pigments.
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Chrysophytes
Phylum Chrysophyta, contain members called Chrysophytes.
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Most of them are unicellular but some can be colonial, which means they are joined together.
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They are different from plants as they do not have any organs, such as roots, leaves, and stems.
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