F2 Workbook Ch11 Integrated Exercise Answers

A. Multiple choice                 p.84

1.     D

2.     C

3.     D

4.     B

5.     C

6.     A

7.     D

8.     C

B. Fill in the blanks               p.90

1.     (a)    sight

        (b)    light receptors

        (c)    retina

        (d)   optic nerve

        (e)    blind spot

C. Questions                           p.91

1.     (a)    Stimulus/stimuli: Temperature of water

                Sense organ(s): Skin

                Sense(s): Heat and cold

        (b)    Stimulus/stimuli: Chemicals / citric acid / lemon juice in the drink

                Sense organ(s): Tongue

                Sense(s): Taste

        (c)    Stimulus/stimuli: Chemicals / LPG / town gas in air

                Sense organ(s): Nose

                Sense(s): Smell

        (d)   Stimulus/stimuli: Light and sound / thunder and lightning

                Sense organ(s): Eyes and ears

                Sense(s): Sight and hearing

2.     (a)    P : lens; Q : cornea; R : iris; S : optic nerve

        (b)    (i)     P , Q and T

                (ii)    This allows light to pass through.

        (c)    Retina. It contains light receptors that can detect light and send signals to the brain.

        (d)   (i)     This point is called the blind spot.

                (ii)    No, we cannot see the object. The reason is that there are no light receptors on the blind spot, no signals are produced when the light from an object is focused on it.

3.     (a)    (i)     The lens

                (ii)    The retina

        (b)    (i)     Short sight

                (ii)    A person with short sight can see near objects but not distant objects clearly.

                (iii)   The lens is thicker than normal or the eyeball is too long.

        (c)

               

                                (or other reasonable answers)