-
A potential mother of blood group B- requires a blood transfusion before her first pregnancy, what blood group(s) can she receive safely if the husband is of Rh+ ve blood. Explain your answer.
Date posted:
September 30, 2019
-
Evolutionary changes take place in a population to maintain a balanced community, basing your answer on blood transfusion, explain the role played by nature on distribution of;
(i) Blood group O
(ii) Blood group AB in the population
Date posted:
September 30, 2019
-
The table below shows the approximate distribution of human blood groups in a sample of 100 people in a population.
Calculate the percentage of Rhesus negative (Rh -) in the whole group of donors.
Date posted:
September 30, 2019
-
Differentiate between Chemotropism and Phototropism.
Date posted:
September 30, 2019
-
Give the function of the following features found in the wall of trachea and bronchi in
a mammal.
(i) Ciliated cells
(ii) Mucus secreting cells
Date posted:
September 30, 2019
-
A student estimating a cell size of an onion epidermal cells observed the following on the microscope field of view using a transparent ruler.
The student identified 20 cells across the field of view. Calculate the size of the cell inMicrometers (show your working)
Date posted:
September 30, 2019
-
Explain why a thirsty person should not drink soda to quench the thirst.
Date posted:
September 30, 2019
-
State the disease and treatment in condition where is increase in blood sugar and appearance of sugar in urine of man.
Date posted:
September 30, 2019
-
Name the enzyme responsible for breaking down sodium hydrogen carbonate in mammalian blood to release carbon dioxide.
Date posted:
September 30, 2019
-
Study the diagram below and answer the questions that follow:
(a) Identify the organelle.
(b)Name the structure labelled K
(c)State two functions of the organelle named in (a) above
Date posted:
September 30, 2019
-
Explain why vegetables should not be overcooked.
Date posted:
September 30, 2019
-
State two precautions which should be taken when storing a microscope after a laboratory exercise.
Date posted:
September 30, 2019
-
State the use of each of the following apparatus:
I)Bait trap
ii) Specimen bottle
iii) Pitfall trap
Date posted:
September 30, 2019
-
The binomial name of housefly is MUSCA DOMESTICA.
i) Statetwo mistakes in the way the scientific name is written.
ii) Re-write the name in correct manner following the rules of binomial nomenclature
Date posted:
September 30, 2019
-
State advantages of fruit/seed dispersal.
Date posted:
September 30, 2019
-
Explain the method of transfusion and prevention of:
(i) Typhoid and Amoebic dysentry.
(ii) Malaria
Date posted:
September 30, 2019
-
Briefly explain the process of inhalation in man.
Date posted:
September 30, 2019
-
A baby who is suckling has a lower chance of contracting infection than one who feeds from the bottle. Explain.
Date posted:
September 30, 2019
-
What are the advantages and disadvantages of having blood group O?
Date posted:
September 30, 2019
-
Calculate the respiration quotient (RQ) from the equation below:-
a)
b) Identify the substrate being respired in the above equation
Date posted:
September 30, 2019
-
The figure below represents a structure obtained from the ileum of a mammal.
a) Give the identity of the structure.
b) What is the importance of the structure named in (a) above?
c) Name the parts labeled A, B and D
Date posted:
September 30, 2019
-
Name the carbohydrate stored in:
i) Cell wall
ii) Mammalian liver
Date posted:
September 30, 2019
-
State the type of solution that makes the plant cell.
i) Flaccid
ii) Turgid
Date posted:
September 30, 2019
-
A student measured the length of a mitochondrion on a photomicrograph whose magnification was X 40000 and found it to be 1mm. Calculate the actual size of the mitochondrion.
Date posted:
September 30, 2019
-
Name one example of the specialized cells in plants and one example in animals.
(i) Plants
(ii) Animals
Date posted:
September 30, 2019
-
The equation bellows shows a chemical reaction that takes place in green plants under certain conditions.
a) Name the
i) Process represented by the equation
ii) Substance represent by X
b) Other than the reactants, state two conditions necessary for this reaction to occur.
c) Name three types of cells in which the process occurs
Date posted:
September 30, 2019
-
Two herbivorous mammal species were introduced into an ecosystem at the same time and in equal numbers. The graph below represents their populations during the first seven years. Study the graph and answer the questions that follow.
(a) (i) Which species has a better competitive ability?
(ii) Give a reason for your answer.
(b) Account for the shape of the curve for spicies A between;
(i) One year and three years
(ii) 4 years and eight years.
(c) A natural predator of species A was introduced into the ecosystem. With a reason, state how the
population of each species would be affected?
(d) State four other biotic factors of the ecosystem which affects organisms distribution in their habitat other than the one illustrated in the above graph.
(e) Name the instruments used to measure the following;
(i) Light intensity.
(ii) Light penetration in water.
(iii) Speed of wind.
(iv) Atmospheric pressure
Date posted:
September 30, 2019
-
(a) Name two substances transported in blood plasma.
(i)
(ii)
(b) Wanjiru is blood group A.
(i) Name an antibody found in her blood plasma.
(ii) Name an antigen found in her red blood cell.
(iii) Name the blood groups she can donate to
Blood groups-
(i)
(ii)
(c) What is meant by the term allergy?
(d) Name one substance that can cause allergy
Date posted:
September 30, 2019
-
The diagram below represents two process underwent by a plant cell.
(a) Identify process X
(b) Name the state of the cell after undergoing process
(i) X.
(ii) Z .
(c) Name the substance which is found in parts labelled;
(i) P.
(ii) Y .
(d) Name parts labelled M and Q.
(e) Name the cell organelle which is usually referred to as 'cell’s kitchen'.
Date posted:
September 30, 2019
-
In an experiment to analyze a 200cm3 sample of air was treated with pyrogallic acid. This reduced its volume to 168cm3. Potassium hydroxide was then added and the volume of gas reduced further to 160cm3.
(a) What was the role of pyrogallic acid?
(b) What was the role of potassium hydroxide?
(c) Calculate the percentage of oxygen and percentage of carbon (iv) oxide in the sample
(d) Suggest the likely biological source of carbon (iv)oxide gas.
(e) State the behavior of external intercostal muscles during exhalation.
(f) Explain why smokers are more prone to respiratory tract infections than the non- smokers
Date posted:
September 30, 2019