An experiment was carried out to investigate the rate of reaction shown below.
Sucrose -> Fructose + Glucose
For the products fructose and glucose to be formed, it was found that substances K was to be added and the temperature maintained at #37^0C#. when another substance L was added, the
reaction slowed down and eventually stopped.
(a) Suggest the identity of substances K and L.
(b) Other than(Answered) Name the characteristic of living organisms illustrated by each of the activities described below:
(a) Dressing heavily
(b) Bursting of the sporangium in the Rhizopus sp.(Answered) State two characteristics of living things illustrated in the paragraph below.(Answered) Below is an illustration of piece of apparatus strategically positioned to trap some organisms.
(a) Name the apparatus.
b) State the function of the part labeled E.(Answered) State the importance of each of the following in living organisms:
(a) Nutrition
(b) Excretion.(Answered) How does nutrition as a characteristic of living organisms differ in plants and animals?(Answered) State one use, for each of the following apparatus in the study of living organisms.
(a) Pooter
(b) Pitfall trap.(Answered) State the name given to the study of:
(a) The cell
(b) Micro-organisms.(Answered) Motor vehicles move, use energy and produce carbon dioxide and water. Similar characteristics occur in living organisms yet motor vehicles are not classified as living. Explain.(Answered) Describe the role of hormones in the human menstrual cycle(Answered) State three advantages of a sexual reproduction(Answered) Explain why sexual reproduction is important in organisms(Answered) Which sex chromosomes are found in human? Sperm cell and Ova(Answered) List four differences between meiosis and mitosis(Answered) Figures 1 and 2 below represent reproductive organ of plants and an animal respectively.
(a) Which letters in figures 1 and 2 represents the organs that produce female gametes? Figure 1 and Figure 2
(b) What is the function of the structure labeled S?
c) Name the structure labeled W
(d) Which letters in figures 1 and 2 represents the structures where fertilization takes place
(e) Which letter in (Answered) Give a reason why it is necessary for frogs to lay many eggs(Answered) Describe the role or each of the following hormones in the human menstrual cycle
(i) Oestrogen
(ii) Progesterone
(iii) Luteinising hormone(Answered) The diagram below illustrates the role played by red blood cells in the transportation of carbon (IV)oxide.
(a) Other than carbon (IV) oxide transportation in the red blood cells, name the other form of
carbon (IV) oxide transportation in humans.
(b) (i) name substance F.
(ii) name the enzyme marked G and state its role in the reaction.(Answered) Explain why transportation of carbon (IV) oxide in red blood cells is advantageous(Answered) Explain the role of calcium in blood clotting.(Answered) Why is a burning charcoal stove in a poorly ventilated room likely to cause death of the inhabitants?(Answered) Describe the process of blood clotting in human beings.(Answered) Explain three protective functions of mammalian blood.(Answered) State the advantage of possessing blood group AB.(Answered) Using a relevant example, describe how an allergic reaction occurs in a human being.(Answered) State two differences between open and closed circulatory systems(Answered) What is the function of contractile vacuoles of amoeba?(Answered) Name the muscles found in the following organs:
-Stomach
-Bone(Answered) State two ways in which heart muscles are special(Answered) Describe the condition known as varicose veins(Answered) What is the role of blood platelets in the clotting process?(Answered) The diagram below shows blood circulation in mammalian tissue.
(a) Name the parts labeled P and Q.
(b) Name the substances that are:
(i) Required for respiration that move out of capillaries
(ii) Removed from tissue cells as a result of respiration.
(c) Name one component of the blood that is not found in the part labeled(Answered) Explain how substances move from blood capillaries into the tissue cells(Answered) State three structural differences between arteries and veins(Answered) Explain three ways in which red blood cells are adapted to their function(Answered) Explain why it is not advisable to be in a poorly ventilated room with a burning charcoal stove(Answered) State three structural differences between arteries and veins in mammals(Answered) Name a disease that causes thickening and hardening of arteries(Answered) Name the opening to the chamber of the heart of an insect(Answered) Name an organism which has single circulatory system(Answered) What is a single circulatory system?(Answered) State the adaptation that enables the red blood cells to move in blood capillaries(Answered) Name the antigens that determine human blood groups(Answered) State two ways in which the red blood cells are adapted to their function.(Answered) What prevents blood in veins from flowing backwards?(Answered) State three functions of blood other than transport(Answered) Name one defect of circulatory system in humans(Answered) Why would carboxylhaemoglobin lead to death?(Answered) The diagram below shows a vertical section through a mammalian heart.
(a) Name the parts labeled A, B, E and F.
(b) Give a reason why the wall of chamber C is thicker than chamber D.(Answered) Distinguish between natural and acquired immunity.(Answered) In what form is oxygen transported from the lungs to the tissues?(Answered) Name the blood vessel that transports blood from:
(i) Small intestines to the liver.
(ii) Lungs to the heart.(Answered) The type of circulatory system found in members of the class insect is?(Answered) A person whose blood group is AB requires a blood transfusion. Name the blood groups of the donors.(Answered) Why are people with blood group O universal donors?(Answered) How can low blood volume be brought back to normal?(Answered) Name the process by which the human body naturally stops bleeding?(Answered) How may excessive bleeding results in death?(Answered) Describe the path taken by carbon dioxide released from the tissue of an insect to the atmosphere.(Answered) State two ways by which Acquired Immuno Deficiency Syndrome (AIDS) virus is transmitted.(Answered) Explain why significantly increasing the blood PH slows down the rate of selective reabsorption of materials in the kidney tubules.(Answered) In investigating a certain physiological process, students set up the apparatus as shown below and made the observations after 30 minutes as illustrated.
(a) Name the physiological process being investigated.
(b) Account for the observation made at the end of the experiment.
(c) State the likely identity of G.(Answered) Explain why transfusion with distilled water is not recommended for a dehydrated patient.(Answered) The diagram below illustrates the appearance of a plant cell after it had been put in a certain solution.
(a) Explain the appearance of the cell at the end of the treatment.
(b) Explain the results obtained if a red blood cell is subjected to the same treatment(Answered) Explain the physiological process responsible for keeping young seedlings upright.(Answered) The set up below illustrate a certain physiological process.
(a) (i) Name the physiological process
(ii) Give two examples of the process named in (a) (i) above in plants.
(b) State two ways by which the movement of dye molecules in the set up would be slowed down.(Answered) Students set up an experiment as illustrated below.
(a) Name the physiological process that resulted in the observation made after 30 minutes.
(b) State the importance of the physiological process investigated in plants.
(c) Explain the observation made after 30 minutes.(Answered) The table provided shows the concentration of sodium and iodine in sea water and cell sap of a plant.
(a) (i) Name the process through which the plant
cell take up sodium ions.
(ii) Give a reason for your answer in (a) (i) above.
(b) If the plant was sprayed with a chemical that inhibit respiration.
(i) Which of the two ions uptake will be affected?
(ii) Give a reason for your answer in (b) (i)(Answered) What is meant by each of the following terms?
(i) Crenated cell
(ii) Flaccid cell(Answered) Explain two roles of diffusion in human beings.(Answered) The diagram below shows a set up for an experiment to demonstrate a certain physiological process
(a) What nature of solution is represented by 20% sugar solution?
(b) Explain the observation made on the set up after one hour.(Answered) State two ways in which osmosis is significant to plants(Answered) Describe how turgor pressure builds up.(Answered) Why is the palisade layer a tissue?(Answered) The diagram below represents a cell as seen under an electron microscope.
(a) Based on the diagram, state whether it represents an animal cell or plant cell
(b) Give two reasons for your answer in (a) above(Answered) Explain how an increase in temperature affects the rate of active of transport.(Answered) What is meant by term Wilting?(Answered) State three factors that affect the rate of diffusion.(Answered) In an investigation a student extracted three pairs of pawpaw cylinders using a cork borer. The cylinders were cut back to 50mm length and placed in a beaker containing a solution. The results after 40 minutes were as shown in the table below.
(a) Account for the results in the table above.
(b) What would be a suitable control set up for the investigation?(Answered) The diagram below show an experimental set-up to investigate a certain process in a plant tissue.
Explain the results obtained after 30 minutes.(Answered) Distinguish between haemolysis and plasmolysis(Answered) Name the type of movement that occurs within a plant cell(Answered) State one role that is played by osmosis in animals(Answered) State one role that is played by osmosis in Plants(Answered) Distinguish between diffusion and active transport(Answered) A freshly obtained dandelion stem measuring 5cm long was split lengthwise to obtain two similar pieces. The pieces were placed in solutions of different concentrations in petri dishes (L1 and L2) for 20 minutes. The appearance after 20 minutes is as shown
(a) Account for the appearance of the pieces in solution L1 and L2
(b) State the significance of the biological process involved in the (Answered) The diagram below show a red blood cells that was subjected to a certain treatment.
Account for the shape of the cell at the end of the experiment(Answered) Distinguish between diffusion and osmosis(Answered) An experiment was set up as shown below.
The setup was left for 30 minutes.
(a) State the expected results
(b) Explain your answer in (a) above(Answered) State the importance of osmosis in plants.(Answered) Outline three roles of active transport?(Answered) How do the following factors affect the rate of diffusion?
(i) Diffusion gradient
(ii) Surface area to volume ratio.
(iii) Temperature(Answered) Why is oxygen important in the process of active transport in cells?(Answered) Explain what would happen to red blood cells if they are placed in a concentrated salt solution.(Answered)