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a)klinostat/clinostat;
b)
i)the radicle remains /grow horizontally;
ii)rotation of klinostal causes uniform distribution of auxins/ indoleacetic acid; hence uniform growth/clongations (no curvature formed); c)the experiment repeated but with stationary klinostat;
d)
-(tropism)enable plants to get water-hydrotropism;
-chemotropism aids plants in fertilization and nutrients absorption;
-thigmotropism enable weak plants to obtain support
-phototropism enable plants to obtain light for photosynthesis;
-geotropism enables the roots grow down the soil towards the centre of the earth thus providing support to the plant
marto answered the question on October 7, 2019 at 09:34
- 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. Answers (1)
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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
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Date posted: October 7, 2019. Answers (1)
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(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. Answers (1)
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a) Growth
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Date posted: October 7, 2019. Answers (1)
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The diagram below represents a growth pattern of arthropods.
(a) Name the type of growth pattern represented on the graph.
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)
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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
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Date posted: October 7, 2019. Answers (1)
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The diagram below represents female reproductive system.
a) Name the part labeled; A, B, C and D
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)
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a) Name the hormones I, II and III
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c) Name the control labelled A & B
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Date posted: October 7, 2019. Answers (1)
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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. Answers (1)
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(ii) Give a reason for your answer
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)
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Date posted: October 7, 2019. Answers (1)