Lungs have numerous alveoli to increase surface area for diffusion of gases; alveoli have thin
membrane which minimizes resistance against gases; blood flowing in the capillaries contains
less oxygen and more C02 since it is from the body tissue; alveoli are supplied with air through bronchioles which link them to the trachea; alveoli are supplied with many capillaries containing
blood to transport gases; air in the alveoli contain more oxygen and combine with haemoglobin,
forming oxyhaemoglobin; C02 diffuses out of the blood into the alveoli ;from where it is exhaled;
sharon kalunda answered the question on May 22, 2019 at 10:53
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An experiment was set up to demonstrate the necessity of carbon (IV) oxide for
photosynthesis in a certain green plant as shown below. The plant was...
(Solved)
An experiment was set up to demonstrate the necessity of carbon (IV) oxide for
photosynthesis in a certain green plant as shown below. The plant was first kept
darkness for 48 hours before the experiment.
a), Why was the plant kept in darkness for 48 hours before the start of this experiment.
b), What was the role of sodium hydroxide?
ci)What was the results shown by the leaf in the flask when it was tested for presence of starch after
the set up was exposed to light for a day?.
ii), Give reasons for your answer in (c) I above
d. Suggest a control for this experiment.
e), Name other two limiting factors in this experiment.
Date posted:
May 22, 2019
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Answers (1)
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Name two harmones that bring about rapid cell division in plants
(Solved)
Name two harmones that bring about rapid cell division in plants
Date posted:
May 22, 2019
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Answers (1)
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In an experiment a group of students set up the test tubes as shown below
a), What was the aim experiment?
b), Why was pyrogallic acid...
(Solved)
In an experiment a group of students set up the test tubes as shown below
a), What was the aim experiment?
b), Why was pyrogallic acid included in the gas jar. A?
c), What results would you expect in each of the gas jar A and B at the end of experiment?
Date posted:
May 22, 2019
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Answers (1)
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Give an explanation why haemophilia is more common in males than in females.
(Solved)
Give an explanation why haemophilia is more common in males than in females.
Date posted:
May 22, 2019
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Answers (1)
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The diagram below shows some components of a light microscope.
a), Name the parts labeled
K –
M –
b), State the functions of
P –
Q –
c) A...
(Solved)
The diagram below shows some components of a light microscope.
a), Name the parts labeled
K –
M –
b), State the functions of
P –
Q –
c) A student was viewing a prepared slide of a plant cell under high power microscope.
The features of the cell were blurred. Which one of the labeled parts of the microscope
would the student use to obtain; A sharper outline of the features
Date posted:
May 22, 2019
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Answers (1)
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State two functions of ovaries in humans.
(Solved)
State two functions of ovaries in humans.
Date posted:
May 22, 2019
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Answers (1)
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The diagram below shows a phenomenon which occurs during cell division.
a) Identify the stage of cell division in which this phenomenon occurs.
b) State the...
(Solved)
The diagram below shows a phenomenon which occurs during cell division.
a) Identify the stage of cell division in which this phenomenon occurs.
b) State the importance of the phenomenon taking place in the part labeled B.
Date posted:
May 22, 2019
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Answers (1)
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What causes apical dominance?
(Solved)
What causes apical dominance?
Date posted:
May 22, 2019
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Answers (1)
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What is meant by self sterility with reference to flowers?
(Solved)
What is meant by self sterility with reference to flowers?
Date posted:
May 22, 2019
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Answers (1)
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Use the graph below to answer the following questions.
(a) Why does the activity of the enzyme become constant after a while?
(b) State how the activity...
(Solved)
Use the graph below to answer the following questions.
(a) Why does the activity of the enzyme become constant after a while?
(b) State how the activity of the enzyme may be increased in (a) above.
Date posted:
May 22, 2019
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Answers (1)
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Why is the wall of the left ventricle thicker than that of the right ventricle.
(Solved)
Why is the wall of the left ventricle thicker than that of the right ventricle.
Date posted:
May 22, 2019
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Answers (1)
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State three preventive measures of schistosomiasis in human beings
(Solved)
State three preventive measures of schistosomiasis in human beings
Date posted:
May 22, 2019
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Answers (1)
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Below is a diagram of an organelle.
(a) State the function of the organelle drawn above.
(b) Name the parts of the organelle where :
(i) Oxygen...
(Solved)
Below is a diagram of an organelle.
(a) State the function of the organelle drawn above.
(b) Name the parts of the organelle where :
(i) Oxygen gas is produced as a byproduct.
(ii) Carbon (IV) oxide is utilized.
Date posted:
May 22, 2019
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Answers (1)
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The diagram below represents a transverse section of a plant part. Study it and answer the questions that
follow.
a)Name the class in which the plant belongs.
b)...
(Solved)
The diagram below represents a transverse section of a plant part. Study it and answer the questions that
follow.
a)Name the class in which the plant belongs.
b) Give a reason for answer (a) above.
c) State one adaptation for the structures labeled X to their functions.
Date posted:
May 22, 2019
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Answers (1)
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What is the role of roughage in a diet?
(Solved)
What is the role of roughage in a diet?
Date posted:
May 22, 2019
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Answers (1)
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Under what condition is lactic acid formed in human muscles?
(Solved)
Under what condition is lactic acid formed in human muscles?
Date posted:
May 22, 2019
.
Answers (1)
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What are the names of modified leaves enclosing bougainvillea flowers whose function is to
attract insect pollinators?
(Solved)
What are the names of modified leaves enclosing bougainvillea flowers whose function is to
attract insect pollinators?
Date posted:
May 22, 2019
.
Answers (1)
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Equal amounts of crushed Irish potato were placed in equal volumes of hydrogen peroxide solution
at indicated pH. The volume of the gas produced was measured...
(Solved)
Equal amounts of crushed Irish potato were placed in equal volumes of hydrogen peroxide solution
at indicated pH. The volume of the gas produced was measured and recorded as shown in the table
below.
(a) Name the gas that was produced.
(b)Account for the difference in the volume of the gas produced in pH 4.0 and pH 9.0
Date posted:
May 22, 2019
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Answers (1)
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The diagram below represents a plant
a) Name the division to which the plant belongs.
b) Give a reason for your answer in (a) above.
(Solved)
The diagram below represents a plant
a) Name the division to which the plant belongs.
b) Give a reason for your answer in (a) above.
Date posted:
May 22, 2019
.
Answers (1)
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Name the branch of Biology that involves the study of Organisms for the sake of classifying them.
(Solved)
Name the branch of Biology that involves the study of Organisms for the sake of classifying them.
Date posted:
May 22, 2019
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Answers (1)