(a) Cones - Discrimination of colours/ details/ accurate/ vision colour
- Perception/ sensitivity to high light intensity or bright light
(b) Rods - sensitive to dim light vision or low light intensity
johnmulu answered the question on May 24, 2017 at 05:06
- 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. Answers (1)
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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. Answers (1)
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(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. 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.
(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. 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.
Date posted: May 19, 2017. Answers (1)
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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. Answers (1)
- 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. Answers (1)
- (a) What is a tropic response?
(b) State two ways by which auxins regulate growth in seedlings. (Solved)
(a) What is a tropic response?
(b) State two ways by which auxins regulate growth in seedlings.
Date posted: May 19, 2017. Answers (1)
- 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. Answers (1)
- (a) Name the hormone that is responsible for apical dominance.
(b) What is thigmotropism? (Solved)
(a) Name the hormone that is responsible for apical dominance.
(b) What is thigmotropism?
Date posted: May 19, 2017. Answers (1)
- (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. Answers (1)
- 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
(ii) Explain how the response named in (a)(i) above occurs
(b) What is the importance of tactic response to microscopic plants?
Date posted: May 19, 2017. Answers (1)
- A shoot of seedling exposed to light on one side bends towards the source of light as it grows
(a) Name the response exhibited by the shoot of the seedling.
(b) Explain how the bending towards the source of light occurs (Solved)
A shoot of seedling exposed to light on one side bends towards the source of light as it grows
(a) Name the response exhibited by the shoot of the seedling.
(b) Explain how the bending towards the source of light occurs
Date posted: May 19, 2017. Answers (1)
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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. Answers (1)
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(a) Name two vestigial structures in human beings.
(b) Why are some bacteria able to resist the effect of antibiotics?
Date posted: May 19, 2017. Answers (1)
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Explain the theory of evolution by natural selection.
Date posted: May 19, 2017. Answers (1)
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State the importance of divergent evolution to organisms.
Date posted: May 19, 2017. Answers (1)
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Explain how comparative embryology is an evidence for organic evolution.
Date posted: May 19, 2017. Answers (1)
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(b) State two limitations of fossils as an evidence of evolution. (Solved)
(a) What is meant by convergent evolution?
(b) State two limitations of fossils as an evidence of evolution.
Date posted: May 19, 2017. Answers (1)
- (a) State two ideas proposed by Lamarck in his theory of evolution.
(b) Why is Lamarck's theory not acceptable? (Solved)
(a) State two ideas proposed by Lamarck in his theory of evolution.
(b) Why is Lamarck's theory not acceptable?
Date posted: May 15, 2017. Answers (1)