1 Chapter 11 Sensing the Environment 1. When a person looks at an object, which part of the eye will change in thickness so that light can be focused onto the retina? (A) iris (B) lens (C) cornea (D) optical nerve ##B## 2. Which of the following diagrams best shows what happens when light passes through a pair of short sighted glasses? (A) (B) (C) (D) ##D## 3. Humans interpret seeing, hearing, tasting and smelling in the (1) cerebrum. (2) cerebellum. (3) medulla. (A) (1) only (B) (2) only (C) (1) and (3) only (D) (2) and (3) only ##A## 4. Sound can be transmitted through 2 (A) (B) (C) (D) ##C## 5. (1) wood. (2) water. (3) vacuum. (1) only (2) only (1) and (2) only (2) and (3) only What kind of eye defect will result if structure P becomes cloudy? P (A) (B) (C) (D) ##B## colour blindness cataract long sight short sight 6. When we detect the flavour of a food, which of the following senses is/are involved? (1) taste (2) touch (3) smell (A) (1) only (B) (2) only (C) (1) and (3) only (D) (2) and (3) only ##C## 7. Which of the following structures of eyes help(s) focus light onto the retina? (1) focusing muscle (2) cornea 3 (A) (B) (C) (D) ##D## (3) lens (1) only (2) only (1) and (3) only (2) and (3) only 8. Which of the following tastes is/are the primary type(s) of tastes? (1) sour (2) spicy (3) salty (A) (1) only (B) (2) only (C) (1) and (3) only (D) (2) and (3) only ##C## 9. What is the function of focusing muscle? (A) It focuses light. (B) It controls the size of the pupil. (C) It changes the thickness of the lens. (D) It squeezes teardrops out of the eyes. ##C## 10. A long-sighted person cannot see a (i) object clearly as the image is formed (ii) the retina. (i) (ii) (A) near in front of (B) near behind (C) distant in front of (D) distant behind ##B## 11. Which part of our ears is filled up with liquid? (A) ear canal (B) auditory nerve (C) ear bones (D) cochlea 4 ##D## 12. Which of the following combinations is correct? cells P Name of the cells (A) (B) (C) (D) ##D## cells P : rod cells cells P : cone cells cells Q : rod cells cells Q : cone cells cells Q Function of the cells help us see different colours give black and white vision give black and white vision help us see different colours 13. Consider the following experimental set-up. Three students talk to each other using this set-up. All of them can hear what their partners say. paper cup paper clip string What is the conclusion of this experiment? (A) Air particles pass through the string to transmit sound. (B) Sound is transmitted by the to and fro motions of the cups. (C) Sound can be transmitted through air. (D) Sound can be transmitted through a solid. ##D## 5 14. Which structure(s) shown in the diagram below is/are transparent? (1) (2) (3) (A) (B) (C) (D) ##C## (1) only (2) only (1) and (3) only (2) and (3) only 15. A fish focuses images (A) (B) (C) (D) ##C## by changing the shape of the lenses. by moving the retina forwards and backwards. by moving the lenses forwards and backwards. by changing the size of the pupil. 16. What is the audible frequency range of humans? (A) about 10 – 200 Hz (B) about 2000 – 10,000 Hz (C) about 20 – 20,000 Hz 6 (D) about 200 – 10,000 Hz ##C## 17. Which structures in the eye can change shape? (1) (2) (3) (A) (B) (C) (D) ##D## (1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3) 18. When we detect sound with our ears, which structure(s) in the ears will vibrate? (1) pinna (2) eardrum (3) ear bones (A) (1) only (B) (2) only (C) (1) and (3) only (D) (2) and (3) only ##D## 19. Which of the following is NOT correct? Stimuli detected (A) (B) (C) (D) ##C## heat light smell of chemical substances sound Sense touch sight taste hearing 20. The following diagram shows the structure of a human ear. 7 structure X What is the function of structure X? (A) To collect sound. (B) To send message to the brain. (C) To detect the vibrations and changes them into messages. (D) To magnify the vibrations of the eardrum. ##D## End