Get premium membership and access questions with answers, video lessons as well as revision papers.
a) Goiter;
b) Scurvy;
marto answered the question on October 3, 2019 at 11:12
- A biological washing detergent contains enzymes which remove stains like mucus and oils from clothes which are soaked in water with the detergent:-
(a) Name two...(Solved)
A biological washing detergent contains enzymes which remove stains like mucus and oils from clothes which are soaked in water with the detergent:-
(a) Name two groups of enzymes that are present in detergent
(b) Explain why stains would be removed faster with the detergent in water at 35 degree C rather than at 15 degrees C
Date posted: October 3, 2019. Answers (1)
- State three adaptations of aquatic plants to photosynthesis.(Solved)
State three adaptations of aquatic plants to photosynthesis.
Date posted: October 3, 2019. Answers (1)
- The diagram below shows chemical reactions A and B which are controlled by enzymes x and y.(Solved)
The diagram below shows chemical reactions A and B which are controlled by enzymes x and y.
(a) Name:
(i) Reaction A.
(ii) Enzyme y
Date posted: October 3, 2019. Answers (1)
- a) A leaf of a potted plant kept in darkness for 48hours was smeared with Vaseline jelly then exposed to sunlight for 8hours. Explain why...(Solved)
a) A leaf of a potted plant kept in darkness for 48hours was smeared with Vaseline jelly then exposed to sunlight for 8hours. Explain why the test for starch in the leaf was negative.
(b) Name two other processes that were interfered with in the plant.
Date posted: October 3, 2019. Answers (1)
- The diagram below shows cells in plants:-(Solved)
The diagram below shows cells in plants:-
(a) Identify the cells shown above
(b) Explain how the cells are adapted to their function
(c) Explain how accumulation of carbon (IV) Oxide in the cells above would lead to the closure of structure A
Date posted: October 3, 2019. Answers (1)
- The two cells shown below are obtained from two different potato cylinders which were immersed in tow different solutions P and Q.(Solved)
The two cells shown below are obtained from two different potato cylinders which were immersed in tow different solutions P and Q.
a)
i) Name the structure labelled A.
ii) State the function of structure B.
b) If eight of cell I were observed across the diameter of the filed of view of 0.5 mm. Work out the actual diameters of each cell in micrometers.
c) Suggest the identity of the solution Q.
d) Account for the change in cell I above.
e) State any one importance of the physiological process being demonstrated above in animals
Date posted: October 3, 2019. Answers (1)
- Two fresh potato cylinders of equal length were placed one in distilled water and the other in concentrated sucrose solution:
(a) Account for the change in...(Solved)
Two fresh potato cylinders of equal length were placed one in distilled water and the other in concentrated sucrose solution:
(a) Account for the change in length of the cylinder in:
(i) Distilled water
(ii) Sucrose solution
(b)
(i) What would be the result in terms of length if a boiled potato was used?
(ii) Explain your answer in(b)(i) Above
(c) State two uses of the physiological process being demonstrated in the experiment
Date posted: October 3, 2019. Answers (1)
- Name two plant processes in which diffusion plays an important role.(Solved)
Name two plant processes in which diffusion plays an important role.
Date posted: October 3, 2019. Answers (1)
- Name support tissues in plants characterized by the following
(i) Cells being turgid
(ii) Cells being thickened by cellulose
(iii) Cells being thickened by lignin(Solved)
Name support tissues in plants characterized by the following
(i) Cells being turgid
(ii) Cells being thickened by cellulose
(iii) Cells being thickened by lignin
Date posted: October 3, 2019. Answers (1)
- An experiment was carried out to investigate the effect of different concentrations of sodium chloride on human red blood cells. Equal amounts of blood were...(Solved)
An experiment was carried out to investigate the effect of different concentrations of sodium chloride on human red blood cells. Equal amounts of blood were added to equal volumes of the salt solution but of different concentrations. The results are shown in the table below.
(a) Account for the results in the set-up
(b) If the experiment was repeated using 1.4% sodium chloride solution, state the expected results with reference to:
(i) the number of red blood cells
(ii) the appearance of red blood cells if viewed under the microscope
Date posted: October 3, 2019. Answers (1)
- Briefly state two adaptation for each of the following cells to their functions
(i) Spermatozoon
(ii) Palisade mesophlly cell(Solved)
Briefly state two adaptation for each of the following cells to their functions
(i) Spermatozoon
(ii) Palisade mesophlly cell
Date posted: October 3, 2019. Answers (1)
- The figure below shows the results obtained when red blood cells are put in different solutions.(Solved)
The figure below shows the results obtained when red blood cells are put in different solutions.
(a) What is the name given to the process that occurs when the cell is put into solution B?
(b) Compare the results obtained when the cell is put in solution B to the results that would be obtained if a plant cell was put in the same solution
Date posted: October 3, 2019. Answers (1)
- The diagram below shows the results obtained when red blood cells are placed in different solution.(Solved)
The diagram below shows the results obtained when red blood cells are placed in different solution.
(a) What name is given to the process that occurs when the cell is placed in solution Y?
(b) Describe the process that would occur in a plant cell when placed in a similar solution as that of solution X
Date posted: October 3, 2019. Answers (1)
- The diagrams below show a red blood cell that was subjected to a certain treatment.(Solved)
The diagrams below show a red blood cell that was subjected to a certain treatment.
a)Draw a diagram to illustrate how a plant cell would appear if subjected to the same treatment
b)Account for the shape of the cell at the end of the experiment
Date posted: October 3, 2019. Answers (1)
- State three physiological processes that are involved in movement of substances a cross the cell membrane.(Solved)
State three physiological processes that are involved in movement of substances a cross the cell membrane.
Date posted: October 3, 2019. Answers (1)
- An experiment was set-up as shown below and left for one hour.(Solved)
An experiment was set-up as shown below and left for one hour.
(a) State the expected result at the end of one hour
(b) Explain the observations made in this experiment
Date posted: October 3, 2019. Answers (1)
- The figure below represents an electron micrograph of an organelle that is found in many cells.(Solved)
The figure below represents an electron micrograph of an organelle that is found in many cells.
(a) Identify the organelle
(b) State the function of the organelle
(c) What is the importance of infoldings in the inner membrane.
(d) Give two examples of tissues where you would expect many such organelles in animal body
Date posted: October 3, 2019. Answers (1)
- A cell was found to have the following under a light microscope; cell membrane, irregular in shape, and small vacuoles. Identify the type of the...(Solved)
A cell was found to have the following under a light microscope; cell membrane, irregular in shape, and small vacuoles. Identify the type of the cell above.
Date posted: October 3, 2019. Answers (1)
- Given that the diameter of the field of view of a light microscope is 2000 um. Calculate the size of a cell in mm if...(Solved)
Given that the diameter of the field of view of a light microscope is 2000 um. Calculate the size of a cell in mm if 10 cells occupy the diameter of the field of view.
Date posted: October 3, 2019. Answers (1)
- Why are the following procedures done when preparing sections to be observed under a light microscope?
(a) Making of thin section
(b) Using a sharp blade to...(Solved)
Why are the following procedures done when preparing sections to be observed under a light microscope?
(a) Making of thin section
(b) Using a sharp blade to make the sections
(c) Staining
Date posted: October 3, 2019. Answers (1)