CHAPTER 1 THE WORLD THROUGH OUR SENSES SUBJECTIVE QUESTIONS1.1 Sensory Organs

1 Name the sensory organs that we have.

2 Complete the chart below by using the words given.

(a)

(b)

(c) (d)

Senses(b)

Nerves Brain Effectors Response Receptors

Nerves impulsesStimulus

Nerves impulses

Nerves impulses

Nerves Nerves

impulses

1.2 Senses of Touch

3 Identify the parts labelled (a) to (f) for the structure of human skin.

(a) (b)

(c)

(c)

(c)

1.3 Senses of Smell

4 Fill in the blanks with the suitable words.(a) The two holes in our nose is called

the ______________________. (b) Nose is a sensory organ of _________________.

(c) The roof of the ______________has many sensory cells or receptors to detect smells.

1.4 Senses of Taste

5 Underline the correct word in the brackets so that each sentence becomes a true statement.

(a) The sensory organ for taste is the [nose, tongue].(b) Our tongue can detect [four, five] basic tastes.(c) Our tongue is lined with taste [cells, buds] which

contain many taste receptors.(d) Our sense of [touch, smell] improves our sense of taste.

1.5 Senses of Hearing

6 Tick the statements below that are true.(a) The ear is the sensory organ of hearing.

(b) The ear has two main parts namely the outer ear and the inner ear.

(c) The function of the oval window is to transfer vibration of the ossicles to the cochlea.

7 Match the parts of the ears with their function.

Parts of the ears(a) Pinna(b) Ear canal(c) Eardrum(d) Ossicles(e) Oval window(f) Cochlea(g) Eustachian

tube (h) Auditory nerve(i) Semicircular

canals

1.6 Sense of Sight

8 Name the parts of the human eye structure below..

FunctionAmplify vibrations and transfer them to the oval windowDetects vibrations and converts them into nerve impulsesDirects sounds to the eardrumEqualises air pressure on both sides ofthe eardrum, preventing it from damageCollects and directs sounds into the ear canalDetect position and movement of head to help us keep our balanceTransfer vibrations of the ossicles to the cochleaVibrates when sound waves hit itCarries nerve impulses to the brain

1.7 Light and Sight

9 Find the answers in the box below based on the statements given.

(a) _________________of light occurs when it bounces off the surface on which it falls.

(b) A short-sighted persons need _____________lenses to see distant object clearly(c) A long-sighted persons need _______________lenses to see near objects clearly.(d) Predators have ______________vision to determine the

location of their prey accurately.(e) Examples of _______________of sight are optical illusions

and the presence of the blind spot on our retina.

1.9 Stimuli and Responses in Plants

10 Name the types of tropisms.

OBJECTIVE QUESTIONS1.1 Sensory Organs

1 Organs that detect changes in the surroundings are known asA nerves C sensesB stimuli D sensory organs

2 Cold food do not smell as nice as when it is still hot. This is because cold food

A cannot be smeltB releases less chemicals into the air

Types of tropisms

(a)

(c)

(b)

(d)

C releases more chemicals into the airD does not stimulate the smell receptors

1.2 Sense of Touch

3 Why are the soles of our feet not very sensitive to temperature and touch?

A The dermis is thinB The epidermis is thickC There are many receptorsD The sole has a thick fatty layer

4 Diagram 1 shows the characteristics of K.

Diagram 1

Which of these inferences about K is correct? A K is the front of the forearmB K is only sensitive to temperatureC K is very sensitive to temperatureD K can be used to determine temperature

1.3 Sense of Smell

5 Which of the following are parts of the human nose?I NostrilII Nasal cavityIII Ciliary musclesA I and II only C II and III onlyB I and III only D I, II and III

6 In the human nose, the sensory cells can be found at

A structure of our body Has a large number of heat and cold receptors

A the nostrilB near the epiglottisC the roof of the nasal cavityD the base of the nasal cavity

1.4 Sense of Taste

7 Diagram 2 shows the structure of the human tongue.

Which of the following marked regions would be stimulated when eating pineapple?

1.5 Sense of Hearing

8 Diagram 3 shows the structure of a human ear.

Which of the parts marked A, B, C and D amplifies vibrations and transfers them to the oval window?

9 Which of the following pairs of structure and function is correct?

Structure of Ear FunctionA Auditory nerves Controls the body’s balanceB Cochlea Balances the air pressure in

both earsC Ossicles Amplifies sound vibrationsD Eustachian tube Converts vibrations to nerve

impulses

10 Which of the following parts of the ear is correctly matched with its function?

I Oval window - magnifies vibrationsII Eardrum - vibrates when sound waves hit itIII Ossicles - change vibration into nerve impulsesA I only C II and III only

B II only D I, II and III

1.6 Sense of Sight

11 Which of the following shows the correct path of light as it travels through the eye?

I Pupil Lens Vitreous humour II Cornea Lens Retina III Conjunctiva Sclera Optic nerve

A I and II only C II and III only B I and III only D I, II and III

12 Diagram 4 shows the front view of a human eye.

The size of pupil is controlled byA W C YB X D Z

1.7 Light and Sight

13 An individual with one blind eye will have difficulty inA seeing red objectsB seeing black objectsC recognising colours of objectsD estimating the distance between objects

14 Diagram 5 shows a deer.

Which of the following statements are true about its vision?I It has a wide scope of vision

II It has a similar vision as a rabbit or rat III It is unable to estimate distance accurately A I and II only C II and III only B I and III only D I, II and III

15 Diagram 6 shows the possible image positions in the eye.

Which of the following positions labelled A, B, C and D belongs to a long-sighted person without glasses?

16 Which of the following diagrams shows the correct path taken by light travelling through a glass prism?

A C

B D

1.8 Sound and Hearing

17 Which of the following statements is not true about sound?A Sounds needs a medium to travelB Sounds are produced by vibrationsC Sound can be reflected or absorbedD Hard and smooth surfaces are good absorbers of sound

1.9 Stimuli and Responses in Plants

18 What response in plants that helps the roots to function well? A Positive geotropisme onlyB Negative phototropisme onlyC Positive geotropism and hydrotropism

D Positive thigmotropism and hydrotropism

19 Which of the following plants show responses to nastic movements?

A Cucumber C Mimosa pudicaB Hibiscus plant D Durian plants

REVISION

1 Diagram 1 shows a flow chart of sound waves entering a human ear.

The structure labelled P, Q, R and S represent P Q R SA Ossicles Eardrum Auditory nerve PinnaB Pinna Eardrum Ossicles Auditory nerveC Auditory

nervePinna Eardrum Ossicles

D Eardrum Auditory nerve Ossicles Pinna

2 The information describes a vision.

Which of the following represent the information above?A Illusion optic C Monocular visionB Long-sightedness D Stereoscopic vision

3 Diagram 2 shows an accident ray from medium X to medium

P Ear Canal Q R Cochlea S

Three – dimensional view Small field of vision Judges a distance accurately

Y.

Which of the following pairs represent medium X and Y?

4 Diagram 3 shows the areas of a human tongue.

(a) P, Q, R and S as shown in Diagram 3 are different areas on our tongue. What type of tastes does each of the areas respond to?P : ____________ Q : ___________

R : ____________ S : ___________(b) The surface of our tongue is covered with little bumps.

Name these bumps. _________________________________________

(c) Why does dry food have no taste? _________________________________________ _________________________________________

5 Diagram 4 shows a person having short-sightedness.

(a) Complete the diagram to show where the image is focused.

(b) Recommend type of lenses to correct this problem. ___________________________________________

(c) Explain your answer in (b).___________________________________________

___________________________________________(d) State a problem faced by a person who has short-

sightedness.___________________________________________

(e) Name the spots that are found in our eyes. ___________________________________________ ___________________________________________