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
1 of 12
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
2 of 12
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
3 of 12
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
4 of 12
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)
5 of 12
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
6 of 12
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
7 of 12
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
8 of 12
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.
9 of 12
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.
10 of 12
Explain wat is meant my succession.
Change in community over time due to abiotic factors
11 of 12
Explain what is meant by a climax community.
Stable community with no further succession
12 of 12

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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