Get premium membership and access questions with answers, video lessons as well as revision papers.
Causes of water pollution are varied:
Industrial effluents; have heavy metals that poison aquatic organisms;
Untreated organic matter has phosphates/sulphates/nitrates/salts; that cause eutrophication;
causing algal bloom that deprives the water of nutrients; when the algae die,they lead to an
increase in putrefying bacteria whose decomposition activities lead to the release of awful
smells/odours;
Oil effluents clog respiratory surfaces of aquatic organisms/death due to suffocation;
Domestic effluents/sewage; form a habitat of pathogens that spread water borne diseases;
decomposing sewage promotes eutrophication leading to algal bloom; death promotes/attracts
saprophytic bacteria that use up oxygen in water; causing suffocation/death to aquatic
organisms;
Agrochemicals/fertilizers; phosphates/nitrates; cause eutrophication; heavy metals in
agrochemicals (herbicides/pesticides); affect respiratory surfaces/cause breathing problems;
Hot water; raise temperature of water; killing organisms; dissolves less oxygen; reducing its
content in water;
Oil spillage; in oceans from tanks/refineries; soak feathers of marine birds preventing flight;
clogs respiratory surfaces leading to death; coats photosynthetic phytoplanktons; reduces light
penetration hampering photosynthesis;
Sediments; from soil erosion makes water dirty; making it unfit for consumption; clogs
respiratory surfaces hindering gaseous exchange; reduces light penetration hindering
photosynthesis;
Control methods:
-Enforcement of environmental laws;
-Use of unleaded fuel/petroleum products;
-Proper treatment and disposal of sewage wastes;
-Treatment of industrial effluents before release;
-Public education on correct use of inorganic fertilizers and agrochemicals; and use of
alternatives such as biological control of weeds/pests/organic manure;
-Use of undersea pipelines instead of tankers to transport oil products;
-Cooling hot water before release to water bodies;
Kavungya answered the question on May 13, 2021 at 13:23
- Discuss the various ways in which anaerobic respiration is utilized in industries and homes .(Solved)
Discuss the various ways in which anaerobic respiration is utilized in industries and homes .
Date posted: May 13, 2021. Answers (1)
- Discuss the various mechanisms of opening and closing of stomata(Solved)
Discuss the various mechanisms of opening and closing of stomata
Date posted: May 13, 2021. Answers (1)
- Explain how mammalian bodies regulate glucose and protein levels in their blood(Solved)
Explain how mammalian bodies regulate glucose and protein levels in their blood
Date posted: May 13, 2021. Answers (1)
- Describe the process of urine formation in the mammalian kidneys(Solved)
Describe the process of urine formation in the mammalian kidneys
Date posted: May 13, 2021. Answers (1)
- Describe double circulation in mammals(Solved)
Describe double circulation in mammals
Date posted: May 13, 2021. Answers (1)
- Name any three factors that must be maintained constant in mammalian bodies(Solved)
Name any three factors that must be maintained constant in mammalian bodies
Date posted: May 13, 2021. Answers (1)
- Outline and explain the various homeostatic functions of the liver in mammals(Solved)
Outline and explain the various homeostatic functions of the liver in mammals
Date posted: May 13, 2021. Answers (1)
- What is the importance of a balance diet in human nutrition?(Solved)
What is the importance of a balance diet in human nutrition?
Date posted: May 13, 2021. Answers (1)
- What is digestion?(Solved)
What is digestion?
Date posted: May 13, 2021. Answers (1)
- Explain why the following conditions are necessary for photosynthesis
a. Carbon (IV) Oxide
b. Light
c. Chlorophyll
d. Suitable temperature and pH
e. Water(Solved)
Explain why the following conditions are necessary for photosynthesis
a. Carbon (IV) Oxide
b. Light
c. Chlorophyll
d. Suitable temperature and pH
e. Water
Date posted: May 13, 2021. Answers (1)
- What are the differences and similarities between mitosis and meiosis?(Solved)
What are the differences and similarities between mitosis and meiosis?
Date posted: September 13, 2020. Answers (1)
- Describe the three phases of Phosphogluconate Pathway.(Solved)
Describe the three phases of Phosphogluconate Pathway.
Date posted: April 6, 2020. Answers (1)
- Briefly describe the three distinct stages of interphase(Solved)
Briefly describe the three distinct stages of interphase
Date posted: April 6, 2020. Answers (1)
- Describe the roles of heat, primers and the bacterium Thermus aquaticus in the process of Polymerase Chain Reaction(Solved)
Describe the roles of heat, primers and the bacterium Thermus aquaticus in the process of Polymerase Chain Reaction
Date posted: April 5, 2020. Answers (1)
- Describe the structural difference between proinsulin and insulin(Solved)
Describe the structural difference between proinsulin and insulin
Date posted: April 5, 2020. Answers (1)
- Describe insulin production by genetic engineering(Solved)
Describe insulin production by genetic engineering
Date posted: April 5, 2020. Answers (1)
- Describe the 4 hierarchical levels of protein structure(Solved)
Describe the 4 hierarchical levels of protein structure
Date posted: April 5, 2020. Answers (1)
- Describe how the mammalian body protects itself against infections.(Solved)
Describe how the mammalian body protects itself against infections.
Date posted: February 11, 2020. Answers (1)
- In preparation of temporary slides for viewing under a microscope, give a reason why;
Thin slides are made
The slides are dipped in a dye(Solved)
The question is from the topic of:the cell, subtopic; microscopy
Date posted: January 12, 2020. Answers (1)
- Name the three salivary glands found in the mouth(3mks)(Solved)
The question is from the topic of nutrition in plants and animals; subtopic; digestion in animals.
Date posted: January 12, 2020. Answers (1)