(a) A - Carbon dioxide ;
B - Oxygen ;
(b) Oxygen - Needed for tissue respiration to provide energy;
(c) K - plasma
P - Walls of alveolus
(d) - Moist to dissolve gases which diffuse in solution form ;
- Thin alveolus wall for gases to diffuse across a short distance;
- Supplied with dense network of capillaries for the transportation of gases to end from exchange surface ;
- Have large surface area to volume ratio to increase the rate of gaseous exchange ;
sharon kalunda answered the question on May 29, 2019 at 07:39
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State four functions of bones in mammals.
(Solved)
State four functions of bones in mammals.
Date posted:
May 29, 2019
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Answers (1)
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The diagram below shows a bean seeding pinned in a klinostat. Study the diagram and then answer the questions that follow.
Account for the observation made...
(Solved)
The diagram below shows a bean seeding pinned in a klinostat. Study the diagram and then answer the questions that follow.
Account for the observation made after 48 hours with the klinostat moving.
Date posted:
May 29, 2019
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Answers (1)
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Explain why the number of predators in any ecosystem is always less than the number of preys.
(Solved)
Explain why the number of predators in any ecosystem is always less than the number of preys.
Date posted:
May 29, 2019
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Answers (1)
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What is the meaning of a phrase “biological control of a population”?
(Solved)
What is the meaning of a phrase “biological control of a population”?
Date posted:
May 29, 2019
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Answers (1)
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Distinguish between intraspecific and interspecific competition.
(Solved)
Distinguish between intraspecific and interspecific competition.
Date posted:
May 29, 2019
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Answers (1)
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A student collected a bone from the school garden. The bone was measuring 45 cm. He drew the bone in his book and his diagram...
(Solved)
A student collected a bone from the school garden. The bone was measuring 45 cm. He drew the bone in his book and his diagram was 9 cm long.Calculate the magnification of his drawing.
Date posted:
May 29, 2019
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Answers (1)
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Study the diagram of the nephron below and then answer the questions that follow.
(a) Name the structures labelled S and R.
(b) When some...
(Solved)
Study the diagram of the nephron below and then answer the questions that follow.
(a) Name the structures labelled S and R.
(b) When some pressure is applied at W, a fluid appears at V. Name the fluid formed at V.
(c) State the structural difference between structure labelled Q and the one labelled U.
Date posted:
May 29, 2019
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Answers (1)
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Explain the role of vasodilation in thermoregulation.
(Solved)
Explain the role of vasodilation in thermoregulation.
Date posted:
May 29, 2019
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Answers (1)
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List four differences between aerobic respiration and photosynthesis.
(Solved)
List four differences between aerobic respiration and photosynthesis.
Date posted:
May 29, 2019
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Answers (1)
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In a body of fish, water flows along the gill filament in a direction opposite that of the blood.Explain the importance of this.
(Solved)
In a body of fish, water flows along the gill filament in a direction opposite that of the blood.Explain the importance of this.
Date posted:
May 29, 2019
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Answers (1)
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Describe the influence of auxin on the shoot and root responses in seedling lying horizontally.
(Solved)
Describe the influence of auxin on the shoot and root responses in seedling lying horizontally.
Date posted:
May 29, 2019
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Answers (1)
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Describe the characteristics and functions of the three types of muscle found in mammalian body.
(Solved)
Describe the characteristics and functions of the three types of muscle found in mammalian body.
Date posted:
May 29, 2019
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Answers (1)
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In an ecological study a grass hopper population and that of crows was estimated in a certain grass land area over a period of
one year....
(Solved)
In an ecological study a grass hopper population and that of crows was estimated in a certain grass land area over a period of
one year. The results are as shown in the table below.
a) i) What is the relationship between the rainfall and grasshoppers population?
ii) Account for the relationship stated in a (i) above
b) Explain the relationship between the grasshopper and the crows population.
c) If the data was used in the construction of pyramid of numbers, what would be the trophic level of:
i) Grasshopper
ii) Crows
iii) The grass in the study area
d) If the area studied was on a square kilometer, state
i) One method that could have been used to estimate the grasshopper population.
ii) One method that could have been used to estimate the crows population.
e) Suggest what would happen if a predator for grasshoppers entered the study area.
Date posted:
May 29, 2019
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Answers (1)
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Give the function of the oesophagus in digestion.
(Solved)
Give the function of the oesophagus in digestion.
Date posted:
May 29, 2019
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Answers (1)
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Name an enzyme that is found in the saliva of man and state its function.
(Solved)
Name an enzyme that is found in the saliva of man and state its function.
Date posted:
May 29, 2019
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Answers (1)
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State two mechanism that hinders self pollination in flowering plants.
(Solved)
State two mechanism that hinders self pollination in flowering plants.
Date posted:
May 29, 2019
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Answers (1)
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Define Turgidity.
(Solved)
Define Turgidity.
Date posted:
May 29, 2019
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Answers (1)
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The diagram below represents a set-up to investigate a certain physiological process.
After some time the level of sugar solution was observed to have risen.
a) What...
(Solved)
The diagram below represents a set-up to investigate a certain physiological process.
After some time the level of sugar solution was observed to have risen.
a) What physiological process was being investigated.
b) Account for the rise in the level of sugar solution.
c) Suggest the result that would be observed if the experiment was repeated using a piece of boiled potato.
Date posted:
May 29, 2019
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Answers (1)
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Name one defect of non-disfunction chromosomal mutation.
(Solved)
Name one defect of non-disfunction chromosomal mutation.
Date posted:
May 29, 2019
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Answers (1)
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The diagram below represents a gill of a bony fish . Study it and answer the questions that follow.
Give the function of each of the...
(Solved)
The diagram below represents a gill of a bony fish . Study it and answer the questions that follow.
Give the function of each of the lablled parts A, B and C
Date posted:
May 29, 2019
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Answers (1)