Allows the passage of certain substances but prevents passage of others;
sharon kalunda answered the question on May 27, 2019 at 13:37
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Name two main mineral ions required for transmission of a nerve impulse
(Solved)
Name two main mineral ions required for transmission of a nerve impulse
Date posted:
May 27, 2019
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Answers (1)
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Name the cell organelles which would be abundant in
(a) Sperm cell
(b) Pancreas
(Solved)
Name the cell organelles which would be abundant in
(a) Sperm cell
(b) Pancreas
Date posted:
May 27, 2019
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Answers (1)
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State the importance of Salts glands in halophytes.
(Solved)
State the importance of Salts glands in halophytes.
Date posted:
May 27, 2019
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What is the importance of carriers in active transport.
(Solved)
What is the importance of carriers in active transport.
Date posted:
May 27, 2019
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Answers (1)
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The diagram below shows the structure of a monocotyledonous seed
(a) Name the parts B and D
(b) Name the parts that would stain blue black...
(Solved)
The diagram below shows the structure of a monocotyledonous seed
(a) Name the parts B and D
(b) Name the parts that would stain blue black with iodine solution.
Date posted:
May 27, 2019
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Answers (1)
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Define the following terms in reference to fish locomotion
(a) Pitching
(b) Rolling
(c) Yawing
(Solved)
Define the following terms in reference to fish locomotion
(a) Pitching
(b) Rolling
(c) Yawing
Date posted:
May 27, 2019
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Answers (1)
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Name a disadvantageous gene that is dominant
(Solved)
Name a disadvantageous gene that is dominant
Date posted:
May 27, 2019
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Answers (1)
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State three functions of adrenaline released when a person is faced with an emergency situation.
(Solved)
State three functions of adrenaline released when a person is faced with an emergency situation.
Date posted:
May 27, 2019
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Answers (1)
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Name the basic functional unit of a kidney.
(Solved)
Name the basic functional unit of a kidney.
Date posted:
May 27, 2019
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Answers (1)
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The figure below shows feet of various birds. Study the diagram and answer the questions that follow.
(i) Name the type of evolution represented by the...
(Solved)
The figure below shows feet of various birds. Study the diagram and answer the questions that follow.
(i) Name the type of evolution represented by the diagrams.
(ii) Using Darwin’s theory of evolution, explain how the feet of bird E would have evolved.
(iii) Explain how Larmack could have explained the evolution of feet of bird C.
Date posted:
May 27, 2019
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Answers (1)
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How are respiratory gases, oxygen and carbon (IV) oxide transported to and from tissues in mammals?
(Solved)
How are respiratory gases, oxygen and carbon (IV) oxide transported to and from tissues in mammals?
Date posted:
May 27, 2019
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Answers (1)
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Name the process in the human body that ensures that haemolysis of red blood cells is prevented.
(Solved)
Name the process in the human body that ensures that haemolysis of red blood cells is prevented.
Date posted:
May 27, 2019
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Answers (1)
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What term is used to describe the solution with equal solute concentration as that of the cells?
(Solved)
What term is used to describe the solution with equal solute concentration as that of the cells?
Date posted:
May 27, 2019
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Answers (1)
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An experiment was carried out in which red blood cells were put in salt solutions of different concentrations. The table below shows the percentage of...
(Solved)
An experiment was carried out in which red blood cells were put in salt solutions of different concentrations. The table below shows the percentage of cells which were destroyed by haemolysis in different salt concentration.
(a) Draw a graph of percentage of red blood cells haemolysed against salt concentration.
(b) Explain haemolysis of red blood cells.
(c) From the graph, state:
(i) the salt concentration at which 50% red blood cells were haemolysed.
(ii) the highest salt concentration when the largest number of red blood cells were haemolysed.
(d) (i) Suggest the normal salt concentration in the blood of the mammal from which the red blood cells were obtained.
(ii) Give a reason for your answer in (d) (i) above.
Date posted:
May 27, 2019
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Answers (1)
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A pea plant with smooth seeds was crossed with one with wrinkled seeds. The gene for smooth seeds is dorminant over that for wrinkled seeds....
(Solved)
A pea plant with smooth seeds was crossed with one with wrinkled seeds. The gene for smooth seeds is dorminant over that for wrinkled seeds. Use letter R to represent the dorminant.
(a) State the genotype of the parents if the plant with smooth seeds was heterozygous.
(b) State the gametes produced by the smooth seeds and wrinkled seeds parents.
(c) State the genotype and phenotype of F1 generation. Show your working.
Date posted:
May 27, 2019
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Answers (1)
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The table below shows the number of Leopards and Impala in a grassland park over a period of six years.
(a) (i) What is the average...
(Solved)
The table below shows the number of Leopards and Impala in a grassland park over a period of six years.
(a) (i) What is the average number of Impala in the park during the six years.
(ii) Account for the decrease in the number of leopards between the 4th and 6th year?
(b) Identify the trophic level occupied by
(i) Leopards
(ii) Tick feeding on the leopard.
(c) The two pyramids shown were obtained in the park.
Identify each type of pyramid.
Date posted:
May 27, 2019
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Answers (1)
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Study the diagram shown below of the anterior view of a lumbar vertebra of a mammal.
(a) Name the parts labelled: A,B,C
(b) State the function...
(Solved)
Study the diagram shown below of the anterior view of a lumbar vertebra of a mammal.
(a) Name the parts labelled: A,B,C
(b) State the function of the part labelled D.
(c) State three roles of skeletons in organisms.
(d) State how the part labelled D in adapted for the function stated in (b) above.
Date posted:
May 27, 2019
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Answers (1)
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The graph below shows rates of photosynthesis in a plant at different temperatures.
(a) Account for the decrease in the rate of product formation at 410C...
(Solved)
The graph below shows rates of photosynthesis in a plant at different temperatures.
(a) Account for the decrease in the rate of product formation at 410C from 5 to 20 minutes.
(b) Explain the results obtained at
(i) 250C.
(ii) 360C.
(c) (i) Other than temperature, state one external factor that affect the rate of photosynthesis.
(ii) Suggest the product which could have been used in the experiment.
Date posted:
May 27, 2019
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Answers (1)
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The diagram below shows a model of the nephron of a mammalian kidney.
(a) Which parts of the nephron are represented by the:
(i) Syringe?
(ii) Perforated rubber...
(Solved)
The diagram below shows a model of the nephron of a mammalian kidney.
(a) Which parts of the nephron are represented by the:
(i) Syringe?
(ii) Perforated rubber tubing?
(iii) Free rubber tubing?
(b) Name the type of filtration taking place within the perforated rubber tubing.
(c) What would happen to the contents of the syringe if its handle was slowly pushed forward? Explain.
Date posted:
May 27, 2019
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Answers (1)
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The picture below shows series of beaks in birds.
a) State the type of evolution that may have led to the emergence of the different beaks...
(Solved)
The picture below shows series of beaks in birds.
a) State the type of evolution that may have led to the emergence of the different beaks shown on the pictures above.
(b) Name the type of evolution structure represented by the beaks shown on the pictures above.
(c) Observe the pictures carefully. From your observations, what features are responsible for the different types of beaks?
(d) Suggest the type of food likely eaten by birds whose beaks are shown in pictures A, B, C and D.
(e) Briefly state how beak shown in picture A is adapted to feeding.
Date posted:
May 27, 2019
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Answers (1)