(a) Guard cells;
(b) Cells walls are thicker on the inner side then the outer side; which enables them to pull inwards when the cells are turgid; contains chloroplasts that are able to phosynthesize and produce sugars which enable them to absorb water
(c) Accumulation of carbon (IV) oxide in the leaf forms a weak carbonic acid; lowering the pH which favours conversion of sugar to starch; causing the guard wells to lose turgidity; and close;
marto answered the question on October 3, 2019 at 11:01
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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Distinguish between the following terms :-
a) Magnification and resolution of a microscope
b) Mounting and staining of a specimen
(Solved)
Distinguish between the following terms :-
a) Magnification and resolution of a microscope
b) Mounting and staining of a specimen
Date posted:
October 3, 2019
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Answers (1)
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The figure below represents a certain cell organelle.
(Solved)
The figure below represents a certain cell organelle.
(a)
(i) Identify the cell organelle
(ii) What is the function of the part labelled A
(b) Name the organelles that perform each of the following functions;
(i) Osmoregulation in amoeba
(ii) Carries out digestion and destruction of worn out cell organelles
Date posted:
October 3, 2019
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Answers (1)
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(a) In a laboratory exercise a student observing a drop of pond water under a microscope saw and drew a spirogyra. If the magnification of...
(Solved)
(a) In a laboratory exercise a student observing a drop of pond water under a microscope saw and drew a spirogyra. If the magnification of the eye-piece was x5 and that of the objective lens was x100, what was the magnification of the spirogyra?
(b) If the spirogyra has a length of 5cm at the above magnification, calculate the actual length
in micrometers
Date posted:
October 3, 2019
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Answers (1)
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What is the of nucleus of a cell made up of?
(Solved)
What is the of nucleus of a cell made up of?
Date posted:
October 3, 2019
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Answers (1)
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In a class experiment to establish the size of an onion cell, a leaner observed the following on the microscope field of view
(Solved)
In a class experiment to establish the size of an onion cell, a leaner observed the following on the microscope field of view
If the student counted 20 cells across the diameter of this field of view, calculate the size of one
cell in micrometers
Date posted:
October 3, 2019
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Answers (1)