Grade3_1st Q- Science Answer Key

GRADE3_1st Q- SCIENCE I.

WHAT IS SCIENCE

A. DIRECTIONS: Write a √ on the blank if the phrase describes a characteristic of a good scientist and an X if it does not. ______

1.

believes in superstitions

______

2.

uses senses in observing things

______

3.

records his observations

______

4.

makes guesses based on rumors

______

5.

thinks in logical manner

B. DIRECTIONS: What would a good scientist do in the following circumstances? Circle the letter of the correct answer. 1. Anton has been wondering marine life. Until he is old enough to go scuba diving and explore, he can… a. b. c. d.

read books and magazines about marine life. keep on wondering until he is old enough. watch Finding Nemo. keep a pet fish.

2. Ben wants to find out how a caterpillar becomes a butterfly. To do so, Ben should… a. b. c. d.

watch National Geographic. catch a caterpillar, feed it and observe. ask his yaya to figure it out. ask the palm reader.

3. Carlo tried to do an experiment he read about in the magazine. However, his results were different from that in the article. Carlo should… a. b. c. d.

throw away his experiment. forget about the whole thing. try to do the experiment again. ask his science teacher to do it for him.

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4.

Dan saw a strange insect in the garden. He should… a. b. c. d.

take a picture of the insect. observe it well then get his insect book to find out what it is. step on the insect because it might bite. leave it.

5. Ethan saw a steaming pot and wondered if the steam is hot or cold. Ethan should… a. b. c. d.

ask the cook if it is hot or cold. keep on looking at the steam. pass his hand through the steam to find out. draw the steam in his drawing book.

II.

THE SENSES AND SENSE ORGANS (EYES, EARS, SKIN, NOSE, TONGUE)

A.

DIRECTIONS:

Write T if the sentence is true and F if it is not.

T_____

1.

Scabies is caused by parasites in the skin that can cause itching.

T_____

2.

Tinea flava and athlete’s foot are caused by fungi infections.

T_____

3.

Deafness results when the eardrum in the middle ear is broken.

T_____

4.

A sty is a small boil on the eyelids.

T_____

5.

Acne or pimples form when the skin has too much sebum or oil.

F_____

6.

A person with red, watery and swollen eyes has eye boils.

F_____

7.

An ear discharge happens when water gets in the ears.

F_____

8.

Boils are eye infections caused by pus.

T_____

9.

Sinusitis is a nose ailment that causes headache. ache.

F_____ tongue.

10.

A furry tongue can be caused by biting one’s

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T_____

11.

A mouth sore results from lack of vitamin B or C, a cheek injury or germs.

T_____

12

A nosebleed can be caused by hot weather or strong sneezing.

F_____

13.

Colds are caused by the clogging of the sinus with mucous and symptoms include headache or painful cheeks.

F_____

14.

Tongue cracks are caused by allergies.

T_____

15.

A person has ear discharge when yellowish liquid comes out of the ear because of a pus that developed in the middle ear.

C. DIRECTIONS: Fill in the missing word. Choose from the words in the box. nose hairs

taste buds

nerve ending

brain

sensory cells

nostrils

inner ear

tongue

1.

Your _tongue_____ and nose work together to help you enjoy food.

2.

The tongue has __taste buds__ that gather information about different tastes.

3-4. The _nose hairs__, which are connected to the __sensory cells_____, can be found inside the nose. 5.

The smells that we sense are also accurately identified through the help of our _brain___________.

6.

From the middle ear, vibrations move through the fluid that fills the __inner ear__________.

7.

Air enters your nose through openings called _nostrils_____.

8.

Most _nerve endings_________ are found in the dermis.

4

C. DIRECTIONS: Match column A with column B. Write the correct answer on the blank. ___c___

1.

iris

a.

inner layer of skin where blood vessels, sweat glands and nerve endings are found

___i___

2.

eardrum

b.

oily substance that causes acne or pimples

___a___

3.

dermis

c.

colored part of the eye

___h___

4.

outer ear

d.

organ we use for the sense of touch

___g___

5.

sclera

e.

this makes the pupil become larger in size

___b___

6.

sebum

f.

lets the light enter the eye; the hole in the middle of the iris

___j____

7.

epidermis

g.

white part of the eye

___d____ 8.

skin

h.

part of ear that has a canal that leads to the inner parts

___e___

dim light

i.

this vibrates when sound enters the ears

pupil

j.

outer layer of skin that keeps germs from entering the body

9.

___f____ 10.

D. Write one way of taking care of each of your sense organs. 1.

Eyes: _____________________________________________

2.

Ears: _____________________________________________

3.

Nose: _____________________________________________

4.

Tongue: ___________________________________________

5.

Skin: _____________________________________________

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III.

THE SKELETAL SYSTEM

A. DIRECTIONS: Fill in the blanks. Choose from the words inside the box. pelvis calcium muscles

brain

ribs

hip bone

tendons

backbone

joints

kneecap

1.

The __ribs______ protect your heart and lungs.

2.

_Calcium____ is a mineral that makes bones stronger.

3.

The ___backbone__ protects your spinal cord.

4.

The skull is tough because it protects the ___brain___.

5.

__Joints__________ connect bones to one another.

6.

The hipbone is also known as the ___pelvis_____.

7.

Bones also work with __muscles____ to help you do movements like running and kicking.

8.

The ___hip bone____ protects internal organs like the intestines and urinary bladder.

B. DIRECTIONS: Write a √ on the blank if the sentence shows the proper care of the bones and an X if it does not. __√ _____ 1.

Drink lots of milk which provides calcium.

__X____

Jump from high places.

2.

__√ _____ 3.

Eat a well-balanced diet.

___√ ____ 4.

Take vitamins.

___X___

Play rough games recklessly.

5.

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IV.

JOINTS

A.

DIRECTIONS. Circle the letter of the correct answer.

1. This kind of joint makes it possible for a bone to move in many directions. a.

pivot joint

b.

2.

This joint allows the bones to move around and back.

a.

pivot joint

3.

The shoulder is an example of this.

a.

pivot joint

b.

b.

hinge joint

hinge joint

hinge joint

c. ball and socket joint

c. ball and socket joint

c. ball and socket joint

4. This joint allows bones to move backward and forward in only one direction. a.

pivot joint

b.

5.

The lower arm bones move around this kind of joint.

a.

pivot joint

6.

The hip joint is an example of this.

a.

pivot joint

b.

b.

hinge joint

hinge joint

hinge joint

c. ball and socket joint

c. ball and socket joint

c. ball and socket joint

7. This kind of joint is present in the elbows, knees, fingers and toes. a.

pivot joint

b.

hinge joint

c. ball and socket joint

8. A ___________ is the place where two or more bones are connected to each other. a.

ligament

b.

9.

The ____________ fastens bones together.

a.

ligament

10.

This kind of joint allows you to curl your fingers.

a.

pivot joint

b.

b.

joint

joint

hinge joint

c. skeleton

c. muscle

c. ball and socket joint

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V.

MUSCLES

A. DIRECTIONS: Write V if the muscle movement described is voluntary and I if it is involuntary. ___V____ 1.

Fred can shoot a basketball.

___I____ 2.

Gary blinked when dust entered his eye.

___I____ 3.

Henry shivered when he entered a cold room.

___V____ 4.

Ian ran on the track field.

___I____ 5.

Joe sneezed when he went into a dusty closet.

B. DIRECTIONS: Write a √ on the blank if the underlined words make the sentence correct. If it does not, write the word on the blank that would make the sentence correct. _involuntary___ 1.

Muscles that make your heart beat are voluntary muscles.

___√_________ 2.

Proper stretching helps keep muscles healthy.

___tendons____ 3.

Muscles are connected to bones by tissues called ligaments.

___contracts___ 4.

When a muscle relaxes, the muscle becomes shorter and thicker.

___√_________ 5.

Ligaments hold organs of the body and are slightly thinner than tendons.