- The diagram below represents a transverse.
Section of a young stem.- Name the parts labeled A and B (2mks)
- State functions of the part labeled C, D, E. (3mks)
-
- Why are people with blood group O universal donors. (2mks)
- A person with blood group AB requires blood transfusion. Name blood groups of the donor. (2mks)
-
- Name the type of circulatory system found in insects (1mk)
- Name the blood vessel that transports blood from
- Small intestine to the liver. (1mk)
- Lungs to the heart. (1mk)
- In what form is oxygen transported from the lungs to the body tissues? (1mk)
- Distinguish between natural and acquired immunity. (2mks)
- State four functions of blood other than transport. (4mk)
- Name the antigens that determine human blood groups. (2mks)
- State structural differences between arteries and veins. (6mks)
- Give reasons for carrying out the following procedure when making temporary slides.
- Making thin sections. (1mk)
- Adding water to the sections. (1mk)
- Placing coverslip over the plant section. (1mk)
-
- Distinguish between diffusion and osmosis. (2mks)
- The diagram below show a red blood cell that was subjected to certain treatment.
Account for the shape of the cell. (2mks)
-
- Name the material that strengthens xylem vessels. (1mk)
- Name the tissue that is removed when the bark of the dicotyledonous stem is ringed(1mk)
-
- State what happens during light stage of photosynthesis. (4mks)
- What are the end products light stage. (2mks
- State 2 factors affecting enzymatic activities. (4mks
- How does the following affect the rate of diffusion:
- Diffusion gradient. (2 mk)
- Size of the molecules (2 mk)
- Thickness of the membrane. (2 mk)
- Temperature (2mks)
- Surface area to volume ration. (2mks)
- Explain how the following factors determine the daily energy requirements
- Age (2mks)
- Occupation (2mks)
- Sex (2mks)
-
- Name the appropriate food substances for each of the following enzymes.
- Ptyalin. (2mks)
- Pepsin. (2mks)
- State the two roles of mucus in the stomach. (2mks)
- Name the appropriate food substances for each of the following enzymes.
-
- State 3 adaption of xylem to its function. (3mks)
- Describe how 4 environment factors affect the rate of transportation. (8mks)
-
- State the difference between closed and open circulatory system. (2mk)
- State two ways in which the heart muscles are adapted to their functions. (2mks)
- State the role of the following organelles. (6mks)
- Golgi apparatus
- Ribosomes
- Lysosomes
- Mitochondrion
- Chloroplasts
- Centrioles
MARKING SCHEME
- The diagram below represents a transverse.
Section of a young stem.
- Name the parts labeled A and B (2mks)
- Epidemis
- Pith
- State functions of the part labeled C, D, E. (3mks)
- E. Translocate manufactured food
- D. Dendes to give rise to new cells that produce secondary system and phloem
- E. Transports water mineral salts from the roots to the leaves
- Name the parts labeled A and B (2mks)
-
- Why are people with blood group 0 are universal donors. (2mks)
- Because they donate blood to all other blood groups
- A person with blood group AB requires blood transfusion. Name blood groups of the donor. (2mks)
- A,AB,B,O
- Why are people with blood group 0 are universal donors. (2mks)
-
- The type of circulatory system found in members of the class inseda is (1mk)
- Open circulatory system
- Name the blood vessel that transports blood from
- Small intestine to the liver. (1mk)
- Hepatic portal vein
- Lungs to the heart. (1mk)
- Pulmonary vein
- Small intestine to the liver. (1mk)
- In what form is oxygen transported from the lungs to the body tissues? (1mk)
- Oxyhaemoglobin
- The type of circulatory system found in members of the class inseda is (1mk)
- Distinguish between natural and acquired immunity. (2mks)
- Natural immunity – transmitted from parent to offspring e.g after suffering from a disease.
- State four functions of blood other than transport. (4mk)
- regulation of body temperature
- regulation of PH of body fluids
- Defence against diseases – causing organism
- Prevent excessive bleeding by enhancing clotting
- Name the antigens that determine human blood groups. (2mks)
- Antigen A
- Antigen B
- State structural differences between arteries and veins. (6mks)
ARTERIES VEINS. thick muscular walls thin less muscular walls No valves Have valves Narrow lumen Wide lumen - Give reasons for carrying out the following procedure when making temporary slides.
- Making thin sections. (1mk)
- To reduce layers of cell and allow light to pass through
- Adding water to the plant. (1mk)
- To make cells turgid
- Placing coverslip over the plant section. (1mk)
- To hold specimen in position n ; to protect objectic lens exclude air, dust, foreign particles.
- Making thin sections. (1mk)
-
- Distinguish between diffusion and osmosis. (2mks)
- Diffusion is the movement of molecdes from a region of high concentration to a region of low concentration while osmosis is movement of molecules across a semi-permeable membrane (2mks)
- The diagram below show a red blood cell that was subjected to certain treatment.
Account for the shape of the cell. (2mks)- The red blood cell was placed in hypertonic solution. It loose water by osmosi and become crenated.
- Distinguish between diffusion and osmosis. (2mks)
-
- Name the material that strengthens xylem vessels. (1mk)
- Lignin
- Name the tissue that is removed when the bark of the dicotyledonous is ringed. (1mk)
- Phloem
- Name the material that strengthens xylem vessels. (1mk)
-
- State what happens during light stage of photosynthesis. (4mks)
- Light stage is light dependent. it take place in the grand of the chloroplast
- Light trapped is used to split water molecules into hydrogen and oxygen ions through photolysis energy is formed and it is stored in the form of ATP
- What are the end products light stage. (2mks)
- Hydroge ions; oxygen gas; ATP
- State what happens during light stage of photosynthesis. (4mks)
- State 2 factors affecting enzymatic activities. (4mks
- Temperature – increase in temperature increase enzymatic up to an optimum low temperature inactive enzymes high temperature denature enzymes.
- Enzymatic activity as there is more active site
- How does the following affect the rate of diffusion:
- Diffusion gradient. (2 mk)
- The higher the concentration gradient the higher the rate of diffusion
- Size of the molecules (2 mk)
- Small size molecules diffuse faster than large and heavy molecules
- Thickness of the membraine. (2 mk)
- The thicker the membrane the lower the rate of diffusion
- This is because the distance covered by diffusing molecules is greater however if the membrane is thinner the rate of diffusion is higher.
- Temperature (2mks)
- Increase in energy increases kinetic energy of the molecules and this causes them to move faster hence increases in temperature
- Increases the rate of diffusion and vie-versa.
- Surface area to volume ration. (2mks)
- The greater the surface area to volume ration the higher the rate of diffusion
- Diffusion gradient. (2 mk)
- Explain how the following factors determine the daily energy requirements
- Age (2mks)
- Young people are actively growing hence they require more energy.
- Occupation (2mks)
- Manual workers require more energy equivalent to work done by sederitary workers
- Sex (2mks)
- Men are more muscular hence require more energy than female to maintain every cell
- Age (2mks)
-
- Name the appropriate food substances for each of the following enzymes.
- Ptyalin. (1mks)
- Starch
- Pepsin. (1mks)
- Protein
- Ptyalin. (1mks)
- State the two roles of mucus in the stomach. (2mks)
- Forms protective partner to the stomach all against corrosions by hydrochloric acid and digestive enzymes
- Name the appropriate food substances for each of the following enzymes.
-
- State 3 adaption of xylem to its function. (3mks)
- Walls are strengthen by deposition of ligning to ensure they don’t collapse
- Hollow and narrow to aid caplilarity
- Made up of dead cells to ensure passage of water.
- Describe how 4 environment factors affect the rate of transportation. (8mks)
- TEMPARATURE: The increase in internal temperature of the leaf which in turns increases latent heat of vaporization enhancing evaporation.
- WIND; Wind carries away water vapour as fast as it diffuses out of the leaves increases the rate of transpiration.
- HIGH LIGHT INTENSITY: Light intensity increases rate of photosynthesis where sugar is formed, which is osmotically vapour diffuses out at a higher rate thereby increasing rate of transpiration
- LOW HUMIDITY: When atmosphere is dry or in low water vapour diffuses out of the leaves into dry atmosphere. Due to high saturated deficit water diffuses faster hence increased rate of transpiration.
- State 3 adaption of xylem to its function. (3mks)
-
- State the difference between closed and open circulatory system. (2mk)
- Transport fluid is not confined to the blood vessesl but contains in the general body cavity.
- The transport fluid called blood is conveyed in special tubes reffered to as blood vessels
- State two ways in which the heart muscles are adapted. (2mks)
- Are able to initiate their own contraction
- presence of intercalated discs hence they do not get fatigue
- State the difference between closed and open circulatory system. (2mk)
- State the role of the following organelles. (6mks)
- Golgi apparatus
- They package and transport
- Ribosomes
- Site for protein synthesis
- Lysosomes
- They contain lytic enzymes that destroy aged and unwanted cells
- Mitochondrion
- Site for respiration
- Chloroplasts
- Site for photosynthesis
- Centrioles
- They form clia and flagella.
- Golgi apparatus
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