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A large amount of untreated sewage entered the river. Many fish died. Untreated sewage contains organic matter and bacteria. Explain why many fish died. (5)

Sewage entering the water caused plants to die.Bacteria then decayed this dead organic plant matter (1) through digestion (1).These bacteria will carry out aerobic respiration, using oxygen (1).This therefor...
JC
Answered by Joy C. • Biology tutor
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Compare the structure of eukaryotic and prokaryotic organisms

Typically, such questions are 6 markers. Prokaryotic cells are often found in bacteria, the smallest organisms, often made out of single cells. Eukaryotic cells are much more complex and are often found in a...
AP
Answered by Alexandra P. • Biology tutor
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What is photosynthesis?

Photosynthesis is the process plants undergo to make energy. Carbon dioxide + water > oxygen and glucose. Plants need sunlight for this process to occur. The roots of the plant take water from the soil an...
MB
Answered by Madeleine B. • Biology tutor
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Colour blindness is sex linked and recessive. What is the probability that the son of a carrier female and an unaffected male will be affected by the condition?

The key bit of knowledge required to answer this question is that colour blindness is an X chromosome linked condition. Say the allele for normal vision is (X^N) and the allele for colour blindness is (X^n)....
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Answered by Saahil B. • Biology tutor
3468 Views

I have created a structured question with 3 sections, and I provided the sample answers - See below both Q&A

(a) Describe Pseudomonas aeruginosa and its implications in disease. A: Pseudomonas aeruginosa is a common type of gram-negative bacteria usually found in soil and water. It rarely causes problems in healthy...
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Answered by Ioanna C. • Biology tutor
1144 Views