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i) Ciliary muscles relax and suspensory ligaments are at high tension; hence the lens becomes long and thin. Must score the first part to score the second part.
ii) Circular muscles contract and the radial muscles relax; hence the size of the pupil reduces. Must score the first part to score the second part.
maurice.mutuku answered the question on November 13, 2019 at 06:46
- In which part of the retina is the image formed mostly sharply during conditions of high light intensity.
(Solved)
In which part of the retina is the image formed mostly sharply during conditions of high light intensity.
Date posted: November 13, 2019. Answers (1)
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Name four strengthening tissues in woody stems.
Date posted: November 13, 2019. Answers (1)
- Below is a diagram showing the fore arm bones and muscles covering them.(Solved)
Below is a diagram showing the fore arm bones and muscles covering them.
a) Name the bones represented by; T X Y Z
b) Name the joints formed between;
i) T and X
ii) Y and X
c) Name the muscles labeled P and R.
d) What happens to each muscle as the arm is straightened.
P...................
R..................
Date posted: November 13, 2019. Answers (1)
- State the role of the following nerves in the beating of a mammalian heart;
i) Sympathetic nerve
ii) Vagus nerve(Solved)
State the role of the following nerves in the beating of a mammalian heart;
i) Sympathetic nerve
ii) Vagus nerve
Date posted: November 13, 2019. Answers (1)
- A solution of sugar cane was boiled with a small amount of dilute hydrochloric acid and allowed to cool. Sodium hydrogen carbonate solution was added...(Solved)
A solution of sugar cane was boiled with a small amount of dilute hydrochloric acid and allowed to cool. Sodium hydrogen carbonate solution was added drop by drop until the fizzing stopped. A few drops of benedicts solution were added to the mixture and boiled. An orange precipitate formed at the end of the experiment.
a) What was the role of the following in the experiment;
i) Dilute hydrochloric acid.
ii) Sodium hydrogen carbonate.
b) What conclusion can be drawn from the above experiment?
c) Where was the food substance identified in the experiment produced?
d) Name the substance found in human digestive system that performs the same function as Hydrochloric acid.
e) State two properties of the substance identified in (b) above.
Date posted: November 13, 2019. Answers (1)
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The following diagrams represent embryonic stages of development for various organisms.
a) Name the type of evidence for organic evolution depicted in the diagram.
b) Explain the evidence in (a) above.
Date posted: November 13, 2019. Answers (1)
- Below is a diagram of an organism(Solved)
Below is a diagram of an organism
(a) Identify the kingdom to which the organism belongs.
(b) State the functions of the structures labelled F and G.
(c) Name the material that makes the cell wall of the organism.
Date posted: November 13, 2019. Answers (1)
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The diagram below shows some growth in a plant.
a) Name the type of growth shown in the diagram.
b) Name the part labeled A
c) What is the function of the part labeled B
Date posted: November 13, 2019. Answers (1)
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State two ways through which proteins are assimilated in the body
Date posted: November 13, 2019. Answers (1)
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Explain why a rat has a higher food intake compared to a lizard of the same body weight.
Date posted: November 12, 2019. Answers (1)
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State two major roles of the kidney.
Date posted: November 12, 2019. Answers (1)
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Why is a pyramid of biomass a more accurate way of representing the amount of organic matter present in each trophic level as compared to the pyramid of numbers?
Date posted: November 12, 2019. Answers (1)
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The diagram below represents a section through a chloroplast as seen under the electron microscope.
(a) Name the structure labelled D.
(b) In which labelled structure do we find chlorophyll molecule.
(c) Name the structure labelled, where carbon IV oxide fixation occurs.
Date posted: November 12, 2019. Answers (1)
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Explain why movement of air molecules is not energy driven process.
Date posted: November 12, 2019. Answers (1)
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State two precautionary measures which should be taken in preventing the spread of HIV.
Date posted: November 12, 2019. Answers (1)
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The figure below shows change in dry mass of germinating bean seeds with time.
Account for the;
(i) Decline in dry mass between A and B.
(ii) Rapid increase in dry mass between C and D.
Date posted: November 12, 2019. Answers (1)
- The diagram below represents a cell organelle as seen under electron microscope.(Solved)
The diagram below represents a cell organelle as seen under electron microscope.
(i) Identify the organelle.
(ii) State the function of the organelle named in (i) above in the cell.
(iii) State one visible adaptation that makes it suitable to perform its function.
(iv) Name one cell that has a large number of the organelle named in (i) above.
Date posted: November 12, 2019. Answers (1)
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State the structural differences between the xylem and phloem.
Date posted: November 12, 2019. Answers (1)
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The diagram below represents a kidney nephron.
(a) Name the parts labeled G, and H.
(b) Name the process that takes place in the glomerulus.
(c) Name the substances that are reabsorbed into the blood at the part labeled J.
(d) A patient was found to pass out large volumes of dilute urine.
(i) State the disease from which the patient was suffering from.
(ii) What is the cause of the disease stated in (d) (i) above?
(e) Name substance K.
Date posted: November 7, 2019. Answers (1)
- Work out the chance that a son of a normal man and a woman who is a carrier for haemophilia will be a haemophiliac. Let...(Solved)
Work out the chance that a son of a normal man and a woman who is a carrier for haemophilia will be a haemophiliac. Let the gene for normal blood clotting be H.
Date posted: November 7, 2019. Answers (1)