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16 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are algae? In what forms are they found? |
- Single cells (e.g. phytoplankton) or multicellular organisms. - they are found in colonial or filamentous form. |
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From the following statements which is TRUE or FALSE. - Algae are mainly aquatic (some are terrestrial) and mostly likely to found in damp areas. - All algae are motile (they have a flagella)
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TRUE FALSE (Many are motile) e.g. some green algae whilst some are non-motile such as diatoms |
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What type of reproduction d algae carry out. State any exceptions. |
- Exhibit asexual/sexual reproduction except for euglenoids (asexual only).
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From the following statement which one is TRUE or FALSE. Give examples for the true statement. - All algae are photosynthetic autotrophs but non are heterotrophs - Most algae are photosynthetic autotrophs and some can be heterotrophs |
FALSE TRUE (e.g. euglenoids and dinoflagellates) |
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give examples of multicellular parenchymatous algae. |
- Some Green algae
- Red algae
- Brown algae
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State two properties of algae. Give examples where necessary |
- Largely marine species/seaweeds. - Well defined thallus/body form (e.g. some brown algae) |
Where would you find them? What is their body called? |
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What reproduction do these algae carry out? |
- Both sexual/asexual reproduction with complex life cycles
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Where are algae used? |
- Farmed commercially - used as fertilizer/livestock fodder. - Some red algal species CaCO3 used in coral reef build up.
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What is the environmental/ ecological importance of algae? |
- All algae Primary Producers - Ecologically, comprise initial (1st) trophic (feeding) level in any aquatic ecosystem
+ ultimately support/crucial to all other levels. |
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If algae starts a food chains/webs. What organims would make up other trophic levels?
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Herbivores – 2nd trophic level ↓ *Carnivores → 3rd trophic level, 4th trophic level |
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By looking at a food chain/web, sequence of events are indicated. What are these indications? |
- sequence of events indicating nutritional relationships/*organic C energy transfer between trophic levels in a given ecosystem |
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From the following statements which are TRUE or FALSE - Algae form huge amounts of biomass by an increased primary production (or productivity). - Very important in CO2 + O2 balance (photosynthesis ↔ respiration) in C and O2 cycles. - Algal death/decay releases +nutrient /mineral ions → sink to bottom sea/lake (sediment) and are +reusable. |
- TRUE - TRUE - TRUE
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Define Biomass |
the weight of biomass of unit area per unit of time |
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Define producitivity |
It is the rate of production |
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Give an example of an algae which is very important in biomass production/earth's energy |
Phytoplankton |
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Give an example of an aquatic algae which is a major source of atmosphere O2 |
Diatoms |
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