Science Form 3 CHAPTER 1

 

CHAPTER 1 : STIMULI AND RESPONSES Formative Practice 1.1 1.1 Human Nervous System

1. State two main parts of the human nervous system.

 ________________________  ____________ ________________________ ________________________ ________________________ _________________ _____ 2. (a) What is voluntary action? Give one example of a voluntary action.

 

______________________________________________________________  ______________________  __________ _________________________ _________________________ ________________________ _______________  ___ 

 

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  (b) What is involuntary action? Give one example of an involuntary action.  

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3. What happens if a person has brain injury?

  _________________________________________________________________  ________________________  ____________ ________________________ ________________________ ________________________ _________________ _____  ________________________  ____________ ________________________ ________________________ ________________________ _________________  _____     _________________________________________________________________  4. What is the importance of the network of human nervous system in life?   _________________________________________________________________  ________________________  ____________ ________________________ ________________________ ________________________ _________________  _____    _________________________________________________________________    _________________________________________________________________ 

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Formative Practice 1.2 1.2 Stimuli and Responses in Humans 1. Complete the following mechanism of sight.  

Light

a)

 Aqueous humour 

Vitreous humour 

c)

Optic nerve

b)

d)

Eye lens

2. Which structure of the ear, if damaged, will not influence the mechanism of

hearing?   _________________________________________________________________ 3. Where is the sensory cell for smell located?

  _________________________________________________________________ 4. State the five tastes that can be detected by the tongue.

  _________________________________________________________________  ________________________  ____________ ________________________ ________________________ ________________________ _________________ _____ 5. State two factors that influence the sensitivity of the skin to stimuli.

  _________________________________________________________________  6. (a) State the type of stimulus that can be detected by the tongue.

 

______________________________________________________________  ______________________  __________ _________________________ _________________________ ________________________ _______________ ___ (b) Explain how the stimulus in question 6 (a) can be detected.

 

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Formative Practice 1.3

1.3 Stimuli and Responses in Plants 1. (a) What is tropism?

 

 _______________________  ___________ _________________________ _________________________ ________________________ ______________  __    _______________________________________________________________    (b) State the typ typee of tropism tow towards ards the following stimuli: stimuli:  

(i) Touch: ___________ _______________________ ________________________ ________________________ ___________________  _______ 

 

(ii) Gravity: ________________________ ____________________________________ ________________________ _________________  _____ 

 

(iii) Light: __________ ______________________ ________________________ ________________________ ____________________  ________ 

2. (a) Which parts of a plant show:

           

(i) positive phototropism? _____________________________________________________________  (ii) positive geotropism? ____________________________________________________________  (iii) positive thigmotropism? ____________________________________________________________ 

  (b) Wh What at is the importance importance of hydrotropism to plan plants? ts?  

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______________________________________________________________  3. State one similarity and one difference between the responses of tropism and nastic movement.   ________________________________________________________________    ________________________________________________________________    ________________________________________________________________    ________________________________________________________________ 

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Formative Practice 1.4 1.4 Importance of Responses to Stimuli in Animals 1. State two types of vision of animals.

 

 ________________________  ____________ ________________________ ________________________ ________________________ ________________  ____  2. State the factor that determines the type of vision of animals.

  ________________________________________________________________  3. What is the type of vision of a primary consumer? Give your reasons.

  ________________________________________________________________    ________________________________________________________________    _________________________________________________________________  4. What is the importance of stereophonic hearing?

  _________________________________________________________________    _________________________________________________________________  5. In the dark, Azman can determine the location of a mewing cat. Explain how

 

 Azman is able to determine the the location of the cat.  _______________________  ___________ ________________________ ________________________ ________________________ __________________  ______ 

  _________________________________________________________________    _________________________________________________________________    __________________________________________________________________ 

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Summative Practice 1  Answer the following quest questions: ions: 1. Mark ‘√’ the correct statement and ‘X’ the incorrect statement about the human

nervous system. a) The pperiph eripheral eral nnervou ervouss sys system tem is made uupp of ne nerves rves connecting the brain with the spinal cord. b) Witho Without ut a funct functioning ioning bbrain, rain, vo voluntar luntaryy actions actions canno cannott be carried carried out. c) Playing Playing bbadmi adminton nton is an involunta involuntary ry action. action. d) Impul Impulses ses ccan an onl onlyy be in interpr terpreted eted by by the brain brain.. 2. Figure 1 shows structures P, Q and R of the human nervous system.

P:

Q:

R:

Label P, Q and R in Figure 1.

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3. Figure 2 shows responses A and B of the eye.

(a) State the responses shown shown in Figure Figure 2.  _______________________  ___________ ________________________ ________________________ ________________________ _______________  ___   

(b) State the stimuli that cause these responses.

 

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(c) How do the stimuli cause these responses? _____________________________________________________________  _______________________  ___________ ________________________ ________________________ ________________________ ______________  __ 

  (d) These responses protect the eye especially especially the retina by pr preventing eventing light light of excessive intensity from entering the eye. During the solar eclipse, explain why we should observe this event on the water surface in a basin of water. water.  _______________________  ___________ ________________________ ________________________ ________________________ ______________ __  _______________________  ___________ ________________________ ________________________ ________________________ ______________  __   _______________________  ___________ ________________________ ________________________ ________________________ ______________  __  4. In a science class, Azura studies the mechanisms of hearing and sight.   (a) Draw one flow chart that shows the pathway of sound from a source of sound

entering the ear.

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  (b) Draw one flow chart that shows the pathway of light from an object entering the eye.

5. Figure 3 shows the structure of the human skin.  Y:  Y:

X:

  (a) Label X and Y in Figure 3.   (b) Explain why the fingertip and not the palm of the hand is used to detect Braille  

symbols. ______________________________________________________________ 

 

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  (c) Mazlan classifies the tong tongue ue as skin tha thatt poss possesses esses taste receptors. receptors. Do you agree with the classification of the tongue as skin? Explain your answer.  

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6. (a) What is the importance of the sense of smell when we are in the science laboratory? Give one example.

 

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  (b) Why are dogs in police units trained to detect th thee presence of drugs kept kept in bags?  

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7. (a) State two responses in plants that help photosynthesis.

 

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  (b) How do the two res responses ponses of plants plants in question 7 (a) help photosynthesis?    _______________________  ___________ _________________________ _________________________ ________________________ _____________  _   

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8. (a) Name the type of vision of an eagle.

 

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  (b) W What hat is the importance importance of the type of vision vision iinn qu question estion 8 (a) to the survival of    the eagle?

     

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