(a) X -Pupil,
Y - Circular muscles
(b) (i) Dum light/ low light intensity/ darkness/ dull light
(ii) Circular muscles in iris relax, while radial muscle contract. The pupil becomes bigger allowing more light to enter the eye.
(iii) Allows one to visualize or see objects under dim light
johnmulu answered the question on May 24, 2017 at 07:58
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(a)(i) Explain the changes that take place in the pupil and iris of a human eye when a person moves from a dark room to a room with bright light.
(ii) What is the significance of the changes explained in (a) above.
(Solved)
(a)(i) Explain the changes that take place in the pupil and iris of a human eye when a person moves from a dark room to a room with bright light.
(ii) What is the significance of the changes explained in (a) above.
(b) How does the human eye obtain nutrients?
(c) Explain why images that form on the blind spot are not perceived
Date posted:
May 24, 2017
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Answers (1)
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(a) Where in the human body are relay neurons found
(b) The diagram below represents a neurone
(Solved)
(a) Where in the human body are relay neurons found
(b) The diagram below represents a neurone
(i) Name the neurone
(ii) Name the parts labeled P and Q
(c) State a function of myelin sheath
Date posted:
May 24, 2017
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Answers (1)
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State the function of each of the following parts of human ear.
(a) Ear ossicles
(b) Cochlea
(Solved)
State the function of each of the following parts of human ear.
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(b) Cochlea
(c) Semi circular canals
(d) Eustachian tube.
Date posted:
May 24, 2017
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Answers (1)
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The diagram below represents a reflex arc in human.
(Solved)
The diagram below represents a reflex arc in human.
(a) Name the parts labeled X and Y.
(b) Name the substance that is responsible for the transmission of an impulse across the synapse
Date posted:
May 24, 2017
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Answers (1)
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State the importance of tactic response among some members of kingdom protista.
(Solved)
State the importance of tactic response among some members of kingdom protista.
Date posted:
May 24, 2017
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Answers (1)
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Apart from hearing, state another function of the human ear.
(Solved)
Apart from hearing, state another function of the human ear.
Date posted:
May 24, 2017
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Answers (1)
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The diagram below shows the position of an image formed in a defective eye.
(Solved)
The diagram below shows the position of an image formed in a defective eye.
(a) Name the defect.
(b) Explain how the defect named in (a) above can be corrected.
Date posted:
May 24, 2017
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Answers (1)
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What is the function of the following cells in the retina of human eye?
(Solved)
What is the function of the following cells in the retina of human eye?
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Date posted:
May 24, 2017
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Answers (1)
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The diagram below shows surface view of a human brain.
(Solved)
The diagram below shows surface view of a human brain.
(i) Name the parts labeled B and C.
(ii) State what would happen if the part labeled B was damaged.
Date posted:
May 19, 2017
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Answers (1)
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The diagram below represents a nerve cell.
(Solved)
The diagram below represents a nerve cell.
(a) (i) Identify the nerve cell.
(ii) Give a reason for your answer in (a) (i) above
(b) Name the structure labeled T.
Date posted:
May 19, 2017
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Answers (1)
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In an experiment it was found that when maggots are exposed to light they move to dark areas.
(a) Name the type of response exhibited by the maggots
(b) Name the advantages of the response to the maggots
(Solved)
In an experiment it was found that when maggots are exposed to light they move to dark areas.
(a) Name the type of response exhibited by the maggots
(b) Name the advantages of the response to the maggots
Date posted:
May 19, 2017
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Answers (1)
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A person was able to read a book clearly at arm's length but not at normal reading distance.
(Solved)
A person was able to read a book clearly at arm's length but not at normal reading distance.
(a) State the defect the person suffered from?
(b) Why was he unable to read the book clearly at normal distance.
Date posted:
May 19, 2017
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Answers (1)
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In an accident, a victim suffered brain injury. Consequently he had loss of memory. Which part of the brain was damaged?
(Solved)
In an accident a victim suffered brain injury. Consequently he had loss of memory. Which part of the brain was damaged.
Date posted:
May 19, 2017
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Answers (1)
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In an experiment to investigate a plant response, the set up shown in the diagram below was used.
(Solved)
In an experiment to investigate a plant response, the set up shown in the diagram below was used.
(a) Name the type of response that was being investigated.
(b) If the Klinostat was not rotating:
(i) State the observations that would be made on the seedlings after three days;
(ii) Explain the observations in (b)(i) above.
(c) If the experiment was repeated with the Klinostat roting:
(i) State the observation that was made on the seedlings after three days;
(ii) Give a reason for the observation made on the seedlings
Date posted:
May 19, 2017
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Answers (1)
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The diagram below illustrates a response by a certain plant.
(Solved)
The diagram below illustrates a response by a certain plant.
(a) Name the type of response.
(b) Explain how the response illustrated above occurs.
Date posted:
May 19, 2017
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Answers (1)
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(a) What is a tropic response?
(b) State two ways by which auxins regulate growth in seedlings.
(Solved)
(a) What is a tropic response?
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Date posted:
May 19, 2017
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Answers (1)
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State one survival value for each of the following plants:
(a) Thigmotropism in stems;
(b) Geotropism in roots
(Solved)
State one survival value for each of the following plants:
(a) Thigmotropism in stems;
(b) Geotropism in roots
Date posted:
May 19, 2017
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Answers (1)
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(a) What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants?
(b) State three biological importance of tropisms plants.
(Solved)
(a) What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants?
(b) State three biological importance of tropisms plants.
Date posted:
May 19, 2017
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Answers (1)
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A response exhibited by a certain plant tendril is illustrated below
(Solved)
A response exhibited by a certain plant tendril is illustrated below
(a) (i) Name the type of response
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Date posted:
May 19, 2017
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Answers (1)
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During a lesson, students observed the structure of bat, cat and human forelimbs to determine their evolution relationship.
(Solved)
During a lesson, students observed the structure of bat, cat and human forelimbs to determine their evolution relationship.
(a) State the name given to the structure of the limbs observed by the students.
(b) Name the type of evolution illustrated by the structure of the limbs observed.
(c) What evidence of evolution is illustrated by the limbs?
(d) State the significance of the type of evolution illustrated by the limbs.
Date posted:
May 19, 2017
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Answers (1)