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In what ways can we try to protect a species from extinction? Apart from conserving individual plants and animals, what else needs to be conserved.
In what way do chlorofluorocarbons (CFCs) cause global problems? Which part of the carbon cycle is responsible for the increasing concentration of carbon dioxide in the atmosphere.
What are the principal sources of excessive nitrate and phosphate in rivers and lakes?
What processes remove nitrates from the soil? In what ways do farmers try to improve the quality of (i) their soil, (ii) their crop plants?
What characteristics might a breeder select for in a cereal crop, a farm animal?
Explain why identical twins will have the same genotype. Continuous variation results from environmental effects.
In which three of the following cells is mitosis unlikely to occur? a sperm cell, an epithelial cell of a villus, a hair cell, a cell in the red bone marrow, a red blood cell.
What is plaque? From which part of the teeth is it particularly important to remove plaque. What gum conditions may result from a failure to remove plaque?
Explain the effects of the failure of the pancreas to produce sufficient-insulin. How is this condition treated?
Name the two structures which make up the central nervous system.
List four stimuli which can be detected by the skin. By what means do we become aware of a stimulus? Name the four taste sensations that we can distinguish.
Name one inorganic component of bone. Name three parts of the body where smooth (involuntary or unstriated) muscle may be found.
What is 'vasoconstriction'? What are the effects of vasoconstriction in the skin?
How will you destarch the leaves of a potted plant? How would you check that the destarching had been effective?
Write down the examples of chemical reactions which are catalysed by enzymes in the course of brewing.
Name the chemical elements present in a protein. What name is given to the sub-units which make up all proteins?
Write down the products of alcoholic fermentation? In which cell structures does respiration mostly occur?
Osmosis and transpiration both play a part in the movement of water through a plant. Which of these two processes makes the greater contribution to the movement of water up the trunk of a tree
Name two foods which are a good source of this vitamin. A balanced diet should contain enough energy to meet the body's needs. What else must it contain?
What is the name of the enzyme in gastric juice? What is the function of bile in digestion? State three ways in which the absorbing surface of the small intestine is increased.
How the Electro dialysis process is used for the purification of water samples? Describe the Tertiary treatment process for polluted water.
Write down the name of chemical elements present in a protein. What are the two types of chemical compound which combine to form the lipid?
Write a short note on the unique properties of water and the various structures of liquid water.
Explain in brief the Nutritional types of Bacteria. Explain the factors influencing the Bacterial growth.
Explain the composition and preparation of Bacteriological media.