QUESTIONS
Answer all questions in the spaces provided
- Distinguish between the following terms: - 4marks
- Magnification and resolution of a microscope
- Mounting and staining of a specimen
- Name the organelle that performs each of the following functions in a cell. 3marks
- Transport of packaged glycoproteins
- Destruction of worn out cell organelles
- Synthesis of proteins
- Given that the diameter of the field of view of a light microscope is 2000um. Calculate the size of a cell in mm if 10 cells occupy the diameter of the field of view 2marks
- State three physiological processes that are involved in movement of substances a cross the cell membrane 3marks
- The diagram below illustrates the behaviour of red blood cells when placed into two different solutions X and Y.
- Suggest the nature of solutions X and Y. 2marks
X
Y - Name the process A and B.
A
B
2marks - What would happen to normal blood cell if it were placed in an isotonic solution? 2marks
- Suggest the nature of solutions X and Y. 2marks
- The diagram below represents a cell organelle
- Name the part labeled Y 1mark
- State the function of the part labeled X 1mark
- Briefly explain the fate of the following products from the light stage of the process of
Photosynthesis: 3 marks- Oxygen atoms
- Hydrogen ions
- ATP
- Name the diseases caused by deficiency of: 2marks
- Iodine
- Vitamin C
-
- What is peristalsis? 1 mark
- Explain how the process above is brought about.
2marks - What are the two functions of bile salts during the process of digestion. 2marks
- The table below shows three enzymes A, B and C and their respective optimum PH.
Enzyme Optimum PA A 6.8 B 2.0 C 8.0 - Name the most likely region of the alimentary canal of a mammal where enzyme
B would be found. 1 mark - Give a reason for your answer in (a) (i) above 2marks
- Name the most likely region of the alimentary canal of a mammal where enzyme
- Study the dental formula given below:
I 0/4 C0/0 PM3/3 M2/3- Identify with reasons the mode of feeding of the animals whose dental formula is given above
Mode 1mark
Reasons 2marks - Calculate the total number of teeth in the mouth of the above animal. Show your working.
2marks.
- Identify with reasons the mode of feeding of the animals whose dental formula is given above
-
- Define the term transpiration 2marks
- State three types of transpiration 3marks
- List three forces that facilitate the transport of water and mineral salts up the stem. 3marks
- Name the tissue that is removed when the bark of a dicotyledonous plant is ringed 1 mark
- The figure below represents a diagram of a photometer;
- What is the potometer used for? 1 mark
- Give two precautions, which should be taken when setting up a potometer 2marks
- Name the blood vessel that nourishes the heart 1 mark
- In which form is oxygen transported in the blood. 1 mark
-
- State three structural differences between arteries and veins in mammals. 3marks
- Name a disease that causes thickening and hardening of arteries 1 mark
- Explain two advantages of closed circulatory system over open circulatory system. (2marks)
- List the components of animal circulatory systems 3 marks
- Give two structural differences between a red blood cell and a white blood cell. 2 marks.
-
- what is blood clotting? 1 mark
- Name a protein, vitamin, and an enzyme involved in blood clotting. 3marks
-
- What is immunity? 1 mark
- Distinguish between natural and acquired immunity 2 marks
- What is the role of vaccination against certain diseases 1 mark?
MARKING SCHEME
- Distinguish between the following terms: - 4marks
- Magnification and resolution of a microscope
Magnification. Ability of a microscope to enlarge tiny objects
Resolution. Ability of a microscope to separate between two tiny structures under magnification to appear distinct - Mounting and staining of a specimen
Mounting. The placing of prepared slide on stage of a microscope;
Staining. Use of chemical stain on specimen for clear observation
- Magnification and resolution of a microscope
- Name the organelle that performs each of the following functions in a cell. 3marks
- Transport of packaged glycoproteins
Golgi bodies - Destruction of worn out cell organelles
lysosome - Synthesis of proteins
Ribosomes
- Transport of packaged glycoproteins
- Given that the diameter of the field of view of a light microscope is 2000um. Calculate the size of a cell in mm if 10 cells occupy the diameter of the field of view 2marks
Size of one cell = diameter of field view
No. of cells arranged across the diameter
= 2000μm;
10cells
200μm = 0.2mm
N/B = 1μm = 0.001mms; - State three physiological processes that are involved in movement of substances a cross the cell membrane 3marks
Osmosis
Diffusion
Active transport - The diagram below illustrates the behaviour of red blood cells when placed into two different solutions X and Y.
- Suggest the nature of solutions X and Y. 2marks
X – hypotonic solution;
Y – hypertonic solution; - Name the process A and B. 2marks
A Haemolysis;
B – crenation - What would happen to normal blood cell if it were placed in an isotonic solution? 2marks
The cell will maintain/retain its normal shape.
- Suggest the nature of solutions X and Y. 2marks
- The diagram below represents a cell organelle
- Name the part labeled Y 1mark
Inter grana - State the function of the part labeled X 1mark
Accept site 4 photolysis; contains chlorophyll pigment that traps light;
- Name the part labeled Y 1mark
- Briefly explain the fate of the following products from the light stage of the process of Photosynthesis: 3 marks
- Oxygen atoms combines to form oxygen gas used for respiration. The rest is diffused out during gaseous exchange
- Hydrogen ions enters the dark stage.
- ATP provides energy for carbon(IV) oxide fixation
- Name the diseases caused by deficiency of: 2marks
- Iodine
Goiter; - Vitamin C
Scurvy
- Iodine
-
- What is peristalsis? 1 mark
Involuntary movement of food along the alimentary canal - Explain how the process above is brought about. 2marks
Occurs when the Circular and longitudinal muscles on the wall of oesophagus and intestines contract and relax alternately; - What are the two functions of bile salts during the process of digestion. 2marks
Emulsification
Neutralization of acidic chyme
- What is peristalsis? 1 mark
- The table below shows three enzymes A, B and C and their respective optimum pH.
- Name the most likely region of the alimentary canal of a mammal where enzyme
B would be found. 1 mark
Stomach - Give a reason for your answer in (a) (i) above 2marks
Presence of hydrochloric acid in the stomach to provide acid conditions
- Name the most likely region of the alimentary canal of a mammal where enzyme
- Study the dental formula given below:
I 0/4 C0/0 PM3/3 M2/3- Identify with reasons the mode of feeding of the animals whose dental formula is given above
Mode 1mark
Herbivorous
Reasons 2marks
Lack upper canine and upper incisors - Calculate the total number of teeth in the mouth of the above animal . Show your working.
2marks.
15x 2 -= 30 teeth
- Identify with reasons the mode of feeding of the animals whose dental formula is given above
-
- Define the term transpiration 2marks
Loss of water inform of water vapour from the plants mainly through the stomata. - State three types of transpiration 3marks
Stomatal
Cuticular
lenticular - List three forces that facilitate the transport of water and mineral salts up the stem. 3marks
Cohesion and adhesion
Capillarity
Root pressure
Transpiration pull. - Name the tissue that is removed when the bark of a dicotyledonous plant is ringed
phloem 1 mark
- Define the term transpiration 2marks
- The figure below represents a diagram of a photometer;
- What is the photometer used for? 1 mark
To measure the rate of transpiration in leafy shoot. - give two precautions which should be taken when setting up a photometer 2marks
Assemble apparatus under water;
Apply Vaseline between cork shoot contacts;
Open the reservoir tap;
- What is the photometer used for? 1 mark
- Name the blood vessel that nourishes the heart 1 mark
Coronary Artery; - In which form is oxygen transported in the blood. 1 mark
Oxyhaemoglobin; -
- State three structural differences between arteries and veins in mammals 3 marks
Arteries Veins Thick muscular
No valves (except at the base of pulmonary artery and aorta)
Narrow (small) lumenThin muscular walls
valves present;
Wide (large) lumen; - Name a disease that causes thickening and hardening of arteries 1 mark
Arteriosclerosis
- State three structural differences between arteries and veins in mammals 3 marks
- Explain two advantages of closed circulatory system over open circulatory system. (2marks)
oxygenated and deoxygenated blood are completely separated / do not mix;
Blood flow to organs is well regulated based on demand;
Animals tend to be more active due to efficient transport of gases and nutrients
Blood circulates over longer distances at faster rate due to high blood presence;
(mark any 2 correct) - List the components of animal circulatory systems 3 marks
system of blood vessels in which materials are circulated round the body
Blood, a fluid medium which contains dissolved substances and cells
The heart, a pumping mechanism which keeps blood in circulation - Give two structural differences between a red blood cell and a white blood cell. 2 marks.
Red blood cells • has haemoglobin • smaller size • lacks nucleus
White blood cells • not pigmented • larger size • nucleated -
- what is blood clotting? 1 mark
process in which blood components clump together to prevent loss of blood from an injured/cut vessel - Name a protein, vitamin, and an enzyme involved in blood clotting. 3marks
Protein – fibrinogen/prothrombin
Vitamin - k/quinine
Enzyme – thrombokinase/thromboplatin/thrombin
- what is blood clotting? 1 mark
-
- What is immunity? 1 mark
Resistance to disease by organisms - Distinguish between natural and acquired immunity 2 marks
Natural immunity is inherited/transmitted from parent to offspring/inborn/innate
Acquired immunity is developed after suffering from a disease or through vaccination
- What is immunity? 1 mark
- What is the role of vaccination against certain diseases 1 mark?
protect body against infectious diseases
prevent spread/transmission of certain diseases
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