Below is a diagram of a poorly planned town showing some building and facilitiesa) Giving evidence from the diagram, state two likely sources of water pollution. (2mks)
b) State three ways that the positioning of the refuse pit and sewage works pose danger to the residence of the town. (3mks)
c) Residents living close to the marsh are likely to suffer from malaria. Explain. (1mk)
d) Suggest two control measures to overcome water pollution in the area. (2mks)
The diagram below represents a maize seedling.a) Name the structure labeled A and C (2mks)
b) State the functions of parts labeled A, B and C. (3mks)
c) Name the type of germination exhibited by maize (1mk)Hypogeal germination d) Name two conditions necessary for seed germination other than water and oxygen. (1mk)
e) What is the role of oxygen in seed germination? (1mk)It oxidizes the stored food in the seed to give energy for growth/synthesis of new materials;
The diagram below represents the direction of flow of blood in a gill capillary. The percentage of oxygen in solution at position A, B, P, Q and R is given in the table below.a) Why is the oxygen percentage low at P? (1mk)
Blood coming from the body has supplied the tissue cells with oxygen/ oxygen has diffused out of capillary into the tissue fluid;
b) Using evidence from the data given, suggest what will happen to oxygen in the water at point B. (3mks)
Oxygen concentration at B reduces/will be at lowest; because blood at P has a lower oxygen concertation creating a diffusing gradient; From A to B there is a diffusion gradient hence at B much oxygen has diffused into the from water into the blood;
c) Name the organ into which blood coming from the capillary at Q flows. (1mk)
Heart
d) Suppose the flow of blood in the capillary illustrated above was in the opposite direction, explain the disadvantage it would have to the fish. (2mks)
Amount of exchange of respiratory gasses between blood and water would reduce; because of reduced diffusion gradient;
e) Name the principle where the blood flows in the opposite direction to another fluid. (1mk)
Counter flow system.
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