BIOLOGY!

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Describe the effect nitrogen concentration may have in the river at point B.
Growth of algae; Death of submerged algae; More bacteria to decompose plants; Respiration uses oxygen; Aerobic animals die
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Explain how growth of a forest results in decrease of carbon content of the atmosphere.
Carbon dioxide taken in as a result of photosynthesis; More photosynthesis than respiration; Carbon is fixed into compounds of the trees
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Explain how carbon containing compounds present in leaves that fall to the ground are used by microorganisms in the soil.
Decomposition; Synthesis of structural compounds; Respiration provides energy for growth
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Explain how digestion of insects help the sundew to obtain additional nitrogen compounds.
Insects contain proteins; Digested to amino acids; Which can be absorbed via diffusion
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Explain why ratio of Carbon and nitrogen is higher in the plant tissue than animal tissue.
High proportion of carbohydrate / starch in plant tissue; Cellulose (in cell walls); More protein in animal cells (such as muscle)
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Describe how nitrogen in compounds in a dead plant is made available for use by other plants.
Proteins broken down by saprophytes; Deamination causing ammonia to be formed; Ammonia converted to nitrates; By nitrifying bacteria; Nitrate as intermediate; Nitrate can be absorbed by roots
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Explain the change in mass of crops when mass of fertiliser added increases.
Replaces nutrients removed; Fertiliser provides nitrate needed for amino acid; As more fertiliser is added, there is more growth
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Explain why mass off crop produced stays the same in both fields even when more fertiliser is added.
plants already have enough nitrate / nitrate no longer limiting; Light or another limiting factor is limiting growth
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Explain the advantages of using an inorganic fertiliser such as sodium nitrate compared with an organic fertiliser such as manure.
Easy to handle / apply / transport / store; Known chemical content; Easy to control mass that is added; Releases soluble ions quickly.
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Explain the disadvantages of using an inorganic fertiliser such as sodium nitrate compared with an organic fertiliser such as manure.
Expensive; More readily leads to eutrophication; Environmentally damaging; Lacks some nutrients; Uses resources to make it; Does not add soils structure.
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Explain wat is meant my succession.
Change in community over time due to abiotic factors
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Explain what is meant by a climax community.
Stable community with no further succession
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Other cards in this set

Card 2

Front

Explain how growth of a forest results in decrease of carbon content of the atmosphere.

Back

Carbon dioxide taken in as a result of photosynthesis; More photosynthesis than respiration; Carbon is fixed into compounds of the trees

Card 3

Front

Explain how carbon containing compounds present in leaves that fall to the ground are used by microorganisms in the soil.

Back

Preview of the front of card 3

Card 4

Front

Explain how digestion of insects help the sundew to obtain additional nitrogen compounds.

Back

Preview of the front of card 4

Card 5

Front

Explain why ratio of Carbon and nitrogen is higher in the plant tissue than animal tissue.

Back

Preview of the front of card 5
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