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Form 4 Biology: Response, reception and coordination questions and answers
Distinguish between a simple and conditioned reflex action.
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1.
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? (c) How can the defect be corrected?
2.
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
3.
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 (c) Using an arrow indicate on the diagram the direction of movement of an impulse in the cell.
4.
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.
5.
What is the function of the following cells in the retina of human eye? (a) Cones (b) Rods
6.
(a) What is the function of the following parts of the mammalian ear? (i) Tympanic membrane (ii) Eustachian tube (iii) Ear ossicles (b) Describe how semicircular canals performs their functions.
7.
Describe the functions of the various parts of the human eye
8.
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
9.
Apart from hearing, state another function of the human ear.
10.
State the important of tactic response among some members of kingdom protista.
11.
The diagram below represents a reflex arc in human. (a) Name the part labeled X and Y (b) Name the substance that is responsible for the transmission of an impulse across the synapse
12.
(a) State the function of ciliary muscles in the human eye (b) State two functional differences between the rods and cones in the human eye
13.
Describe the structure and functions of the various parts of the human ear.
14.
(a) Name the part of retina where image is formed. (b) State two characteristics of the image formed on the retina.
15.
(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.
16.
Sate one function for each of the following (a) Cerebellum (b) Medulla oblongata
17.
The diagram below shows how the iris and pupil of a human eye appear under different conditions. (a) Name the structures labeled X and Y (b) (i) State the condition that leads to the change in appearance shown in the diagram labeled B (ii) Describe the changes that lead to the appearance of the iris and pupil as shown in the diagram labeled B (iii) What is the significance of the changes described
18.
The diagram below represents a section of the human brain. (i) Name the structure labeled P and R (ii) State two functions of the part labeled Q
19.
Describe how accommodation in the human eye is brought about when focusing on a near object
20.
State the importance of negative phototaxis to termites.
21.
What is meant by the term irritability?
22.
The diagram below illustrates a defect in the eye. Explain how the defect illustrated above can be corrected.
23.
The diagram below represents the human ear. (a) Name the parts labeled E, F and G (b) How is each of the following adapted to its function? (i) External auditory meatus (ii) Ear ossicles (c) Name one defect of the human ear.
24.
State three differences between tactic and tropic responses
25.
State the function of each of the following parts of a mammalian eye. (a) Eye lashes (b) Lachrymal glands
26.
The diagram illustrates a nerve cell. (a) Name the type of nerve cell illustrated (b) Give a reason for your answer (c) Identify the part labeled J
27.
Give a reason why image is not formed when light is focused on blind spot.
28.
The diagram below represents the transverse section of the spinal cord. (a) Name the part labeled H (b) State two function of the fluid found in the parts labeled J (c) Give a reason for the colour of the white matter.
29.
Below are components of a simple reflex pathway: -Interneurone -Muscle -Motor neurone -Sensory neurone -Pain receptor -Central nervous system List the components in their proper sequence during transmission of a nerve impulse.
30.
The diagram below represents a set up during an experiment (a) (i) What was the experiment investigating? (ii) State the likely identify for substance K (iii) Explain your answer in (a) (ii) above (b) Account for the observation made in flask 2
31.
Distinguish between a simple and conditioned reflex action.
32.
A person accidentally touches a hot pan and responds as illustrated in the diagram below. Explain how the response illustrated above occurs.
33.
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.
34.
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 responses to microscopic plants?
35.
(a) What name is given response to contact with surface exhibited by tendrils and climbing stems in plants? (b) State three biological importance of tropisms plants.
36.
(a) Name the hormone that is responsible for apical dominance (b) What is thigmotropism?
37.
State one survival value for each of the following plants: (a) Thigmotropism in stems (b) Geotropism in roots
38.
(a) What is tropic response? (b) State two ways by which auxins regulate growth in seedlings.
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