a) Directly proportional/ increase in enzyme concentration results in increase in reaction rate
b)
i) Increase in substrate concentration results in increase in reaction rate Increase in concentration results in more active sites occupied by substrate molecules, resulting in higher turn over
ii)A rate of reaction constant/ does not change Active sites fully occupied
iii) Sharp decrease in reaction rate Enzymes denatured
c) PH/ Enzyme inhibitors/ Enzyme co- factors
marto answered the question on October 7, 2019 at 09:51
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The relationship between seed fresh mass in the lupin lupinus and percentage seed germination, percentage seedling survival and seedling fresh mass is shown in the...
(Solved)
The relationship between seed fresh mass in the lupin lupinus and percentage seed germination, percentage seedling survival and seedling fresh mass is shown in the table.
a) How was percentage germination in column two of the table calculated?
b) Why was seed fresh mass preferred to seed dry mass to take measurements of the seed weight in the experiment
c)
i) Explain why the measurements of mean seedling fresh mass (5) weeks after germinated may not have been an accurate measurement of growth that had occurred.
ii) How could more meaningful and accurate measurement been obtained in c(i) above?
d) With reference to the figures in the taste indicate the relationship between seed fresh mass and percentage seed germination, percentage seedling survival and seedling fresh mass.
e) Suggest an explanation why seedling produced from large seeds grow more rapidly than the
seedling produced from small seeds
Date posted:
October 7, 2019
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Answers (1)
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Name the type of cell division that produces gametes.
(Solved)
Name the type of cell division that produces gametes.
Date posted:
October 7, 2019
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Answers (1)
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The diagram below represents a set-up that was used to investigate the effect of rotation on the growth of a bean radicle. The set-up allowed...
(Solved)
The diagram below represents a set-up that was used to investigate the effect of rotation on the growth of a bean radicle. The set-up allowed the seedling to rotate slowly and continuously for seven days.
(a) Name the piece of apparatus illustrated.
(b)
(i) State the observation made on the shape of the radicle after seven days
(ii) Explain the observation in (b) (i) above
(c) Suggest a suitable control for this experiment.
(d) Give any four importance of tropism in plants.
Date posted:
October 7, 2019
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Answers (1)
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The following data represents the development in dry mass of germinating seedlings within 18 weeks:
(Solved)
The following data represents the development in dry mass of germinating seedlings within 18 weeks:
(a) Write reference to the graph, explain the changes in dry mass between:-
(i) Week 0 to 2
(ii) Week 5 to 13
(iii) Week 16 - 18
(b)
(i) What is the significance of time zero?
(ii) What difference would be expected from the above results if the experiment started with the seeds? Give a reason for your answer
(c)
(i) Describe how you carry out the experiment to obtain dry mass in the respective weeks
(ii) State one advantage of using dry mass instead of fresh weight in estimating growth of an organism
Date posted:
October 7, 2019
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Answers (1)
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The experiment set – up below was designed to investigate an aspect of germination.
(Solved)
The experiment set – up below was designed to investigate an aspect of germination.
a) Why was potassium hydroxide pellets used in this experiment?
b) What was the role of moist cotton wool in this experiment?
c) i) By means of an arrow, indicate on the diagram the direction in which red dye would move
during the experiment.
ii) Give reason for your answer in c(i) above.
d) Other than the factor investigated above, state any other one factor necessary for germination
process.
Date posted:
October 7, 2019
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Answers (1)
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The diagram below represents a stage during the process of germination.
(Solved)
The diagram below represents a stage during the process of germination.
(a) (i) Name the type of germination illustrated in the diagram
(ii) Give a reason for your answer in (a) (i) above.
(b) Give two functions of the part labelled X
Date posted:
October 7, 2019
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Answers (1)
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The diagram below represents a growth pattern of arthropods.
(Solved)
The diagram below represents a growth pattern of arthropods.
(a) Name the type of growth pattern represented on the graph.
(b)Identify the process represented by X.
(c) Which hormone is responsible for process at X in (b) above?
Date posted:
October 7, 2019
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Answers (1)
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The illustration below represents an eye defect.
(Solved)
The illustration below represents an eye defect.
Date posted:
October 7, 2019
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Answers (1)
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An experiment was carried out to investigate the rate of growth of pollen tube against time.
The results are shown in the table below.
(Solved)
An experiment was carried out to investigate the rate of growth of pollen tube against time.
The results are shown in the table below.
(b) (i) At what intervals was the growth of the pollen tube measured?
(ii) What was the length of pollen tube at; 130 minutes
(iii) At what time was the length of the pollen tube 18mm?
(iv) With reasons, describe the growth pattern of the pollen tube between:
- 0 to 120minutes
- Reason
- 120 to 180 minutes
- Reason
v) State the importance of the growth of pollen tube to the plant
(c) State the changes that take place in a flower after fertilization
Date posted:
October 7, 2019
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Answers (1)
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The diagram below represents female reproductive system.
(Solved)
The diagram below represents female reproductive system.
a) Name the part labeled; A, B, C and D
b) State two functions of structure A
c) How is part C adapted to its function?
d) Of what significance is part E to reproduction?
Date posted:
October 7, 2019
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Answers (1)
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Why is immunization against diseases encouraged by the government?
(Solved)
Why is immunization against diseases encouraged by the government?
Date posted:
October 7, 2019
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Answers (1)
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What do you understand by the word Acquired Immunity Deficiency Syndrome (AIDS)?
(Solved)
What do you understand by the word Acquired Immunity Deficiency Syndrome (AIDS)?
Date posted:
October 7, 2019
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Answers (1)
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State two ways by which the HIV spread may be controlled through patients in hospitals.
(Solved)
State two ways by which the HIV spread may be controlled through patients in hospitals.
Date posted:
October 7, 2019
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Answers (1)
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The diagram below represents some hormones, their sources and functions in mammals.
(Solved)
The diagram below represents some hormones, their sources and functions in mammals.
a) Name the hormones I, II and III
b) Name hormones IV and state its function
c) Name the control labelled A & B
d) Name one secondary sexual characteristic common to both males and females
Date posted:
October 7, 2019
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Answers (1)
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The diagrams below represent two gynoecia A and B obtained from two different plants.
(Solved)
The diagrams below represent two gynoecia A and B obtained from two different plants.
(a) What name is given to;
Gynoecium A?
Gynoecium B?
(b) State the observable difference between the gnoecia A and B
(c) State the role played by Heterostyly in plants.
Date posted:
October 7, 2019
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Answers (1)
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The diagram below shows a stage during cell division.
(Solved)
The diagram below shows a stage during cell division.
(i) Name the stage of cell division
(ii) Give a reason for your answer
(b) Name two structures in plants where male and female gametes are produced
Date posted:
October 7, 2019
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Answers (1)
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Describe the possible effects of discharging hot effluent from a factory into a slow flowing river.
(Solved)
Describe the possible effects of discharging hot effluent from a factory into a slow flowing river.
Date posted:
October 7, 2019
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Answers (1)
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What is the main product of the dark stage of photosynthesis?
(Solved)
What is the main product of the dark stage of photosynthesis?
Date posted:
October 7, 2019
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Answers (1)
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State the role of centrioles during cell division.
(Solved)
State the role of centrioles during cell division.
Date posted:
October 7, 2019
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Answers (1)
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The diagram below illustrate a process in a given species of organism.
(Solved)
The diagram below illustrate a process in a given species of organism.
a) Name the organism that undergoes the process above.
b) Identify the process shown to be taking place.
Date posted:
October 7, 2019
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Answers (1)