the life cycles of animals - alston publishing · pdf filethe life cycles of animals name:...

The Life Cycles of Animals

Name: Class: Date:

Consolidation Worksheet 1Why Do Animals Reproduce?Tick (ü) the boxes next to the statements that are TRUE.

1 Living things reproduce to ensure the continuity of their own kind.

2 A life cycle is made up of all the stages of an animal’s life.

3 All mammals give birth to their young alive.

4 Not all fishes lay eggs.

5 The life cycles of animals and the life cycles of plants are the same.

66 © 2012 Alston Publishing House Pte LtdAdditional Teacher’s Resources


Name: Class: Date:

Consolidation Worksheet 2What Are the Life Cycles of Some Animals?Complete the flowchart below by filling in the missing words in the boxes. Use the words below to help you. Each word or words can be used only once.

Four stagesMealworm

CockroachLaying eggs

RabbitChicken

Ways of Reproduction

Giving birth to young alive

Three stages

such as

such as such as

Have life cycles with

• Frog

•

•

• Butterfly

• Mosquito

•


Name: Class: Date:

Consolidation Worksheet 1Why Do Animals Reproduce?Tick (ü) the boxes next to the statements that are TRUE.

1 Living things reproduce to ensure the continuity of their own kind.

2 A life cycle is made up of all the stages of an animal’s life.

3 All mammals give birth to their young alive.

4 Not all fishes lay eggs.

5 The life cycles of animals and the life cycles of plants are the same.

© 2012 Alston Publishing House Pte Ltd Science SMART Teacher’s Guide Grade 4 67


Name: Class: Date:

Consolidation Worksheet 3Why Do Young Grow Up to Look Like Their Parents? Which of the following characteristics can be inherited? Which of them cannot be inherited? Complete the flowchart below.

Characteristics

Can be inherited Cannot be inherited

Eye colour

Single or double eyelids

Nail length

Scars

Hair length

Dimples



Name: Class: Date:

Fun and Games Can You Spot Them?

The young of some animals look like their parents, while the young of other animals do not. Spot the animals and their young. Circle each pair or group of adult animals and their young with a different colour.


Name: Class: Date:

Consolidation Worksheet 3Why Do Young Grow Up to Look Like Their Parents? Which of the following characteristics can be inherited? Which of them cannot be inherited? Complete the flowchart below.

Characteristics

Can be inherited Cannot be inherited

Eye colour

Single or double eyelids

Nail length

Scars

Hair length

Dimples



Name: Class: Date:

Exam PracticeProcess skills: Observing, Inferring

Tom visited a farm. He saw a hen sitting on its eggs.

a. Why did the hen sit on its eggs? [1 mark]

b. Tom knows that chicken eggs must be kept at a temperature of about 41 °C for 21 days for the chicks to develop. He built a simple machine as shown below to keep eggs warm. He bought three fertilised chicken eggs from the farm and placed them inside the machine. He observed the eggs for 21 days. However, after 21 days, the eggs did not hatch into chicks.

What could be the reason why the eggs did not hatch? [1 mark]

Air holesEgg

Lightbulb

Styrofoam box

Wire mesh

Bowl of water

Hint:How does the temperature affect how the chicks in

the eggs develop?


Ans

wer

s to

Add

ition

al T

each

er’s

Res

ourc

esA

nsw

ers

to A

dditi

onal

Tea

cher

’s R

esou

rces

Th

e L

ife

Cy

cles

of

An

imal

s

Nam

e:

C

lass

:

Dat

e:

Co

nso

lid

atio

n W

ork

shee

t 2W

ha

t A

re t

he

Life

Cycl

es o

f So

me

Anim

als

?C

ompl

ete

the

flow

char

t bel

ow b

y fil

ling

in th

e m

issin

g w

ords

in th

e bo

xes.

Use

the

wor

ds b

elow

to h

elp

you.

Eac

h w

ord

or w

ords

can

be

used

onl

y on

ce.

Four

sta

ges

Mea

lwor

mC

ockr

oach

Layi

ng e

ggs

Rabb

itC

hick

en

Way

s of

Rep

rodu

ctio

n

Giv

ing

birt

h to

yo

ung

aliv

e

Thre

e st

ages

such

as

such

as

such

as

Hav

e lif

e cy

cles

with

• F

rog

•

•

• B

utte

rfly

• M

osqu

ito

•

Layi

ng e

ggs

Rabb

itFo

ur s

tage

s

Chi

cken

Coc

kroa

chM

ealw

orm

Th

e L

ife

Cy

cles

of

An

imal

s

Nam

e:

C

lass

:

Dat

e:

Co

nso

lid

atio

n W

ork

shee

t 1W

hy D

o A

nim

als

Rep

rod

uce

?Ti

ck (ü

) th

e bo

xes

next

to th

e st

atem

ents

that

are

TRU

E.

1Liv

ing

thin

gs r

epro

duce

to e

nsur

e th

e co

ntin

uity

of t

heir

own

kind

.

2A

life

cyc

le is

mad

e up

of a

ll th

e st

ages

of a

n an

imal

’s lif

e.

3A

ll m

amm

als

give

birt

h to

thei

r yo

ung

aliv

e.

4N

ot a

ll fis

hes

lay

eggs

.

5Th

e lif

e cy

cles

of a

nim

als

and

the

life

cycl

es o

f pla

nts

are

the

sam

e.

✓ ✓ ✓


Name: Class: Date:

Exam PracticeProcess skills: Observing, Inferring

Tom visited a farm. He saw a hen sitting on its eggs.

a. Why did the hen sit on its eggs? [1 mark]

b. Tom knows that chicken eggs must be kept at a temperature of about 41 °C for 21 days for the chicks to develop. He built a simple machine as shown below to keep eggs warm. He bought three fertilised chicken eggs from the farm and placed them inside the machine. He observed the eggs for 21 days. However, after 21 days, the eggs did not hatch into chicks.

What could be the reason why the eggs did not hatch? [1 mark]

Air holesEgg

Lightbulb

Styrofoam box

Wire mesh

Bowl of water

Hint:How does the temperature affect how the chicks in

the eggs develop?


The

Life

Cyc

les

of

An

ima

ls

Ans

wer

s to

Add

ition

al T

each

er’s

Res

ourc

esA

nsw

ers

to A

dditi

onal

Tea

cher

’s R

esou

rces

Th

e L

ife

Cy

cles

of

An

imal

s

Nam

e:

C

lass

:

Dat

e:

Fu

n a

nd

G

ames

Can

Yo

u S

po

t T

hem

?

The

youn

g of

som

e an

imal

s lo

ok li

ke th

eir

pare

nts,

whi

le th

e yo

ung

of

othe

r an

imal

s do

not

. Spo

t the

ani

mal

s an

d th

eir

youn

g. C

ircle

eac

h pa

ir or

gro

up o

f adu

lt an

imal

s an

d th

eir

youn

g w

ith a

diff

eren

t col

our.

Pupi

ls sh

ould

circ

le e

ach

pair

or g

roup

of a

dult

anim

als

and

thei

r yo

ung

with

a d

iffer

ent c

olou

r: fa

rmer

and

girl

; fro

g an

d ta

dpol

es; c

hick

en a

nd

chic

ks; c

ow a

nd c

alf;

butte

rfly

and

cat

erpi

llar.

Th

e L

ife

Cy

cles

of

An

imal

s

Nam

e:

C

lass

:

Dat

e:

Co

nso

lid

atio

n W

ork

shee

t 3W

hy D

o Y

oung

Gro

w U

p t

o L

ook

Lik

e Th

eir

Pa

rents

? W

hich

of t

he fo

llow

ing

char

acte

ristic

s ca

n be

inhe

rited

? W

hich

of t

hem

ca

nnot

be

inhe

rited

? C

ompl

ete

the

flow

char

t bel

ow.

Cha

ract

erist

ics

Can

be

inhe

rited

Can

not b

e in

herit

ed

Eye

colo

ur

Sing

le o

r do

uble

eye

lids

Nai

l len

gth

Scar

s

Hair

leng

th

Dim

ples

Eye

colo

urN

ail le

ngth

Sing

le o

r do

uble

eye

lids

Hair

leng

th

Dim

ples

Scar

s


Ch

ap

ter 1

Ans

wer

s to

Add

ition

al T

each

er’s

Res

ourc

es

Th

e L

ife

Cy

cles

of

An

imal

s

Nam

e:

C

lass

:

Dat

e:

Ex

am P

ract

ice

Pro

cess

sk

ills

: Obs

ervi

ng, I

nfer

ring

Tom

visi

ted

a fa

rm. H

e sa

w a

hen

sitt

ing

on it

s eg

gs.

a.

Why

did

the

hen

sit o

n its

egg

s?

[1 m

ark]

b.

Tom

kno

ws

that

chi

cken

egg

s m

ust b

e ke

pt a

t a te

mpe

ratu

re o

f ab

out 4

1 °C

for

21 d

ays

for

the

chic

ks to

dev

elop

. He

built

a s

impl

e m

achi

ne a

s sh

own

belo

w to

kee

p eg

gs w

arm

. He

boug

ht th

ree

fert

ilised

chi

cken

egg

s fr

om th

e fa

rm a

nd p

lace

d th

em in

side

the

mac

hine

. He

obse

rved

the

eggs

for

21 d

ays.

How

ever

, afte

r 21

day

s, th

e eg

gs d

id n

ot h

atch

into

chi

cks.

W

hat c

ould

be

the

reas

on w

hy th

e eg

gs

di

d no

t hat

ch?

[1 m

ark]

Air

hole

sEg

g

Light

bulb

Styr

ofoa

m b

ox

Wire

mes

h

Bow

l of w

ater

Hin

t:H

ow d

oes

the

tem

pera

ture

af

fect

how

the

chi

cks

in

the

eggs

dev

elop

?

To p

rovi

de w

arm

th fo

r th

e ch

icks

insid

e

the

eggs

to d

evel

op.

The

mac

hine

did

not

pro

vide

eno

ugh

war

mth

for

the

chic

ks in

side

the

eggs

to d

evel

op.


The

Life

Cyc

les

of

An

ima

ls

Glossary

GlossaryChapter 1: The Life Cycles of Animals

Cocoon The protective casing which some insects make for themselves while they grow in their pupal stage

Gene Thepartofthecellthatcontrolsorinfluencesthephysicalcharacteristics of a living thing, and can be passed down from parents to their young

Heredity The passing down of traits from parent to child

Larva (plural: larvae) The newly hatched young of an insect that is wingless and worm-like

Life cycle The stages through which a living thing goes through in its life, from the beginning of its life, to undergoing changes, reaching maturity as well as reproduction

Metamorphosis A great change in appearance in some animals when they become an adult

Moult Shed the old skin or covering and replace it with new growth so that the body can grow bigger

Nymph The young insect that looks almost like the adult except that it is smaller and has no wings

Pupa The stage of development between larva and adult, during which the larva does not eat and undergoes complete transformation within a cocoon

Trait A characteristic or condition

74 © 2012 Alston Publishing House Pte Ltd

Ch

ap

ter 1

the life cycles of animals - alston publishing · pdf filethe life cycles of animals name:...

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