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(a) (i) They are more permeable to water than capillaries.
ii) Z has a wider lumen than N (acc converse)
iii) This increases high blood pressure within the glomerulus.
(b) - One cell thick to reduce distance for reabsorption.
- Cells have numerous mitochondria to produce energy for active transport ; have microvilli to increase surface area for
re-absorption ; Highly coiled to reduce spread of flow to increase time available for reabsorption.
(c) A condition where fluids flow in opposite directions / glomerular filtrate flow opposite direction to blood in capillaries;
parts T and Q.
sharon kalunda answered the question on March 21, 2019 at 13:41
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The shoots were treated as follows.
(a)...(Solved)
An experiment was carried out to investigate the effect of hormones on growth of lateral buds of three pea plants.
The shoots were treated as follows.
(a) Shoot A – Apical bud was removed.
(b) Shoot B – Apical bud was removed and gibberellic acid placed on the cut shoot.
(c) Shoot C – Apical bud was left intact.
The lengths of the branches developing from the lateral buds were determined at regular intervals. The results obtained are shown in the table below.
(i) Using the same axes, draw graphs to show the lengths of branches against time.
(ii) (a) What was the length of the branch in Shoot B on the 7th day?
(b) What would be the expected length of the branch developing from Shoot B on the 11th day?
(iii) Account for the results obtained in the experiment.
(iv) Why was Shoot C included in the experiment?
(v) What is the importance of gibberellic acid in agriculture?
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Date posted: March 21, 2019. Answers (1)
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