Sense Organs

1. With reference to the example of African snail, animals are responsive to _________. (1) and (2) Light Touch Smell Taste (2) and (3) (1), (2) and (3) (1), (2), (3) and (4)

2. Light from the outside enters the eyeball through the retina. the pupil. the optic nerve. the sclerotic coat.

3. Which of the following about the path of light entering the eyes is CORRECT? lens -> pupil -> cornea -> jelly-like fluid -> sclerotic coat pupil -> cornea -> lens -> jelly-like fluid -> retina cornea -> pupil -> lens -> jelly-like fluid -> retina iris -> lens -> jelly-like fluid -> retina

4. Retina contains millions of light-sensitive cells. optic nerve. lens. iris.

(1) and (2) only Nerve endings Rod cells (2) and (3) only Cone cells 5. Which of the followings are light sensitive cells found on the surface of retina? (1) and (2) only Nerve endings Rod cells Cone cells Blind spot cells (2) and (3) only (1), (2) and (3) only (1), (2), (3) and (4)

6. Cone cells can identify _____ , _____ and _____ colours. yellow、green 、blue red 、green 、blue red 、green 、yellow

We can see the object clearly. 7. We have two eyes located at the front of the head, their visions are forward and overlap in the middle. Which of the following is an advantage of this arrangement? We can see the object clearly. It helps us to judge the distance of an object. It helps us to distinguish the colours of the object. It helps us to judge the size of an object.

8. When light rays of an object fall on the blind spot, the person will see the object black. the person cannot see the object. the person will see the object blurred. no image will be formed.

The image of the approaching car at the back falls on the yellow spot. 9. Sometimes a driver may not be able to see the traffic condition behind through the rear view mirror. The reason is because The image of the approaching car at the back falls on the yellow spot. The image of the approaching car at the back falls on the blind spot. The image of the approaching car at the back falls on the optic nerve. No image can be formed on the retina.

10. Which of the following structure detects the sound vibrations? cochlea eardrum ear bone auditory nerve

11. There are three parts in the inner ear : semi-circular canals, vestibule and ________ . eardrum ear bone pinna cochlea

semi-circular canals, cochlea 12. _______ and _______ give the sense of position and balance of the body. semi-circular canals, cochlea semi-circular canals, vestibule vestibule , cochlea ear bones, semi-circular canals

13. Which of the following about the path of sound waves entering the ears is CORRECT? eardrum -> ear canal -> ear bones -> auditory nerve -> cochlea ear bones -> cochlea -> eardrum -> ear canal -> auditory nerve ear canal -> eardrum -> ear bones -> cochlea -> auditory nerve cochlea -> ear canal -> ear bones -> eardrum -> auditory nerve

14. The receptor that can be found inside the nose is pain receptor touch receptor smell receptor taste receptor

15. Which of the following about the tongue is CORRECT? Bitter-sensitive area locates at the tip of the tongue. Sour-sensitive area locates at the two sides of the tongue. Sweet-sensitive area locates at the back of the tongue. The tongue can detect four primary tastes: sour, sweet, bitter and spicy.

Only (i) and (ii) 16. The skin contains different kinds of receptors: Temperature receptor Touch receptor Pressure receptor Pain receptor Only (i)、(ii) and (iii) Only (i)、(ii) and (iv) (i)、(ii) 、(iii) and (iv)