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20 Cards in this Set
- Front
- Back
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Algaes importance to humans? |
Important ecologically but not so important for humans -minor food uses (nori, irish moss, makes ice cream smoother) some industrial materials, and contributing to the formation of petroleum reserves |
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what are some ecological benefits of algae? |
-their contribution tot he world sustains us -foundation of all fisheries -provided huge amounts of oxygen -they absorb and bury carbon dioxide -make reefs that protect our coasts -began to colonize the shores of beachers in advance of early animals |
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what are the requirements of plant life? |
1. light
2. carbon dioxide 3. oxygen 4. water 5. support 6. mineral nutrients |
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how do plants get these requirements in water? |
-easily -they are bathed on all sides by light, co2 oxygen, mineral nutrients dissolved in water, etc |
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how do plants get these requirements on land? |
Divided into terrestrial and aerial environments aerial: light, oxygen, carbon dioxide terrestrail: water, support, mineral nutrients |
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Name the challenges of life on land? |
1. meeting all life requirements in bipolar environment 2. avoiding shading by neighbours 3. finding and moving water/nutrients 4. getting co2 w.out losing water 5. moving photosynthate throughout body 6. supporting plant |
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what does the shoot system of a plant refer to? |
the aerial portion |
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what does the root system of a plant refer to? |
the terrestrial portion |
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what is the most important requirement on land for plants? |
acquiring light -this accomplished by having the widest possible surface area through stems and leaves |
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challenge: water management |
harder to get on land |
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solution: water management? |
-roots push out to find water (increase surface area) -land plants developed xylem for moving water from roots to shoots -epidermis with cuticle and stomates controls water loss into the air from leaves |
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challenge: co2 |
shoot system is protected against water loss by cuticle which also makes it difficult to absorb co2 |
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sollution: co2? |
-stomates control the water loss also involved in co2 uptake |
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challenge: moving sugar |
how do you get sugar tot he darkest part of the plants, like the roots? |
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sugar: solution? |
Phloem is a transport tissue -the phloem and xylem are vascular bundles in vascular tissues |
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Challenge: support |
air is MUCH less dense than water, so plants need vascular tissues to hold themselves upright |
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solution: support |
deveoped a stem |
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What led tot eh integration of 4 different organs and 4 different tissues to algae? |
all of the above mentioned challenges |
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what are the 4 new organs? |
roots, stems, leaves, reproductive organs |
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what are the 4 new tissues? |
nn |
