- Some wastes e.g. gases easily diffuse out of the plant tissues
- Some waste products are mainly made from carbohydrate and hence are not as harmful as proteinases materials
-Some waste products are formed slowly thus little accumulation of wastes
- Plants are less active
- Some waste products such as Oxygen are reused or recycled
johnmulu answered the question on May 5, 2017 at 05:56
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State the importance of the following processes that takes place in the nephrons of a human kidney
(a) Ultra filtration (b) Selective reabsorption
(Solved)
State the importance of the following processes that takes place in the nephrons of a human kidney
(a) Ultra filtration (b) Selective reabsorption
Date posted:
May 5, 2017
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Answers (1)
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(a)Which portion of the human nephron are only found in the cortex?
(b) (i) What would happen if a person produces less antidiuretic hormone?
(ii) What term is given to the condition described in (c) (i) above
(Solved)
(a)Which portion of the human nephron are only found in the cortex?
(b) (i) What would happen if a person produces less antidiuretic hormone?
(ii) What term is given to the condition described in (c) (i) above
Date posted:
May 5, 2017
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Answers (1)
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The diagram below shows a section through the mammalian skin.
(Solved)
The diagram below shows a section through the mammalian skin.
(a) Name the parts labeled E, F and G
(b) State two functions in each case of substance secreted by the structures labeled (i) H (ii) I.
Date posted:
May 5, 2017
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Answers (1)
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Adult elephants flap their ears twice as much as their calves in order to cool their bodies when is it hot. Explain.
(Solved)
Adult elephants flap their ears twice as much as their calves in order to cool their bodies when is it hot. Explain.
Date posted:
May 4, 2017
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Answers (1)
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The temperature of a person was taken before, during and after taking a cold bath. The results are shown in the graph below.
(Solved)
The temperature of a person was taken before, during and after taking a cold bath. The results are shown in the graph below.
(a)Explain why the temperature fell during bath.
(b) What changes occurred in the skin that enabled the body temperature to return to normal?
Date posted:
May 4, 2017
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Answers (1)
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A person was found to pass out large volumes of dilute urine frequently. Name the (a) Disease the person was suffering from, (b) Hormone that was deficient
(Solved)
A person was found to pass out large volumes of dilute urine frequently. Name the (a) Disease the person was suffering from, (b) Hormone that was deficient
Date posted:
May 4, 2017
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Answers (1)
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State the economic importance of anaerobic respiration in plants.
(Solved)
State the economic importance of anaerobic respiration in plants.
Date posted:
May 4, 2017
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Answers (1)
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The diagram below shows an experimental set-up to investigate a certain physiological process in plants .
(Solved)
The diagram below shows an experimental set-up to investigate a certain physiological process in plants .
(a) State the aim of the experiment
(b) Account for the expected colour change in tube F.
Date posted:
May 4, 2017
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Answers (1)
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State two reasons why accumulation of lactic acids leads to an increase in heartbeat.
(Solved)
State two reasons why accumulation of lactic acids leads to an increase in heartbeat.
Date posted:
May 4, 2017
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Answers (1)
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In an experiment, disinfected soaked bean seeds were put in a vacuum flask which was then fitted with a thermometer as shown in the diagram below.
(Solved)
In an experiment, disinfected soaked bean seeds were put in a vacuum flask which was then fitted with a thermometer as shown in the diagram below.
The temperature reading were taken every morning for three consecutive days
(a) Which process was being investigated?
(b) Why were the seeds disinfected?
(c) Why was a vacuum flask used in the set-up?
(d) How would a control for this experiment be set?
Date posted:
May 4, 2017
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Answers (1)
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Explain how anaerobic respiration is applied in sewage treatment
(Solved)
Explain how anaerobic respiration is applied in sewage treatment
Date posted:
May 4, 2017
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Answers (1)
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(a) A dog weighing 15.2 kg requires 216kj while a mouse weighing 50g requires 2736kj per day. Explain.
(b) What is the end-product of respiration in animals when there is insufficient oxygen supply?
(Solved)
(a) A dog weighing 15.2 kg requires 216kj while a mouse weighing 50g requires 2736kj per day. Explain.
(b) What is the end-product of respiration in animals when there is insufficient oxygen supply?
Date posted:
May 4, 2017
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Answers (1)
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Give two reasons why accumulation of lactic acid during vigorous exercise leads to an increase in heartbeat.
(Solved)
Give two reasons why accumulation of lactic acid during vigorous exercise leads to an increase in heartbeat.
Date posted:
May 4, 2017
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Answers (1)
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The diagram below shows a set - up that was used to demonstrate fermentation
(Solved)
The diagram below shows a set - up that was used to demonstrate fermentation
Glucose solution was boiled and added on top it. The glucose solution was then allowed to cool before yeast suspension was added.
(a) Why was the glucose solution boiled before adding the yeast Suspension?
(b) What was the importance of cooling the glucose solution before adding the yeast suspension?
(c) What was the use of oil in the experiment?
(d) What observation would be made in test tube B at the end of the experiment?
(e) Suggest a control for this experiment.
Date posted:
May 4, 2017
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Answers (1)
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The diagram below represents some gaseous exchange structures in humans.
(Solved)
The diagram below represents some gaseous exchange structures in humans.
(a) Name the structure labeled K, L and M.
(b) Name the process by which inhaled air moves from the structure labeled L into blood capillaries
(c) Give the scientific name of the organism that causes tuberculosis in humans
Date posted:
May 4, 2017
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Answers (1)
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(a) Name two structures for gaseous exchange in aquatic plants
(b) What is the effect of contraction of the diaphragm muscles during breathing in mammals?
(Solved)
(a) Name two structures for gaseous exchange in aquatic plants
(b) What is the effect of contraction of the diaphragm muscles during breathing in mammals?
Date posted:
May 4, 2017
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Answers (1)
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The diagram below illustrates a blood capillary surrounding a structure for gaseous exchange in human beings
(Solved)
The diagram below illustrates a blood capillary surrounding a structure for gaseous exchange in human beings
(a) Name the gases exchange structure.
(b) Identify the gases labelled Y and Z.
(c) How does cigarette smoking lead to lung cancer
Date posted:
May 4, 2017
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Answers (1)
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How is a guard cell structurally adapted for gaseous exchange?
(Solved)
How is a guard cell structurally adapted for gaseous exchange?
Date posted:
May 4, 2017
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Answers (1)
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Explain each of the following: (i) The tracheoles lack spiral bands of chitin; (ii) The floor of the mouth is lowered during inhalation in a bony fish.
(Solved)
Explain each of the following: (i) The tracheoles lack spiral bands of chitin; (ii) The floor of the mouth is lowered during inhalation in a bony fish.
Date posted:
May 4, 2017
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Answers (1)
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The diagram below shows the gaseous exchange system of a locust.
(Solved)
The diagram below shows the gaseous exchange system of a locust.
(a) Name the structure labelled Q.
(b) State the function of the part labeled R.
(c) How is the part labeled S structurally adapted tom its function?
Date posted:
May 4, 2017
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Answers (1)