2. Smart Science
Grade 2
TexTbook
Philippine Copyright 2009 by DIWA LEARNING SYSTEMS INC
All rights reserved. Printed in the Philippines
Editorial, design, and layout by University Press of First Asia
No part of this publication may be reproduced or transmitted in any form or by any means
electronic or mechanical, including photocopying, recording, or any information storage and
retrieval systems, without permission in writing from the copyright owner.
Exclusively distributed by
DIWA LEARNING SYSTEMS INC
4/F SEDCCO 1 Bldg.
120 Thailand corner Legazpi Streets
Legaspi Village, 1229 Makati City, Philippines
Tel. No.: (632) 893-8501 * Fax: (632) 817-8700
ISBN 978-971-46-0087-4
RevieweR
Marina Balce was a former assistant dean and associate professor at the College of Education, La
Salle College–Antipolo. She taught biological sciences for Psychology students and thesis writing for
graduating Education students in the same college. She was also a Trainee of the Japan International
Cooperation Agency (JICA) at the Aichi University in Nagoya, Japan, where she attended a special
training on Practical Work in Elementary School Science. Dr. Balce finished her bachelor’s degree in
Secondary Education major in Biology at the University of the East–Manila. She has a master’s degree
in Biology Education from the De La Salle University–Manila and a doctorate in Science Education
major in Biology from the University of the Philippines–Diliman.
3. To the Learner
Do you ask yourself questions about the world you live in?
Do you wonder about what lies beyond the blue skies or what
rests below the seas? Do you ask questions about the blooming
trees and colorful flowers you see, the heat and cold you feel,
or the various scents you smell? Do you wonder about the sun,
the moon, and the stars? Your young, active mind has so many
questions because you are curious about so many things.
This book will help you discover the answers to the
questions you have about yourself, the world, and everything
beyond it. This book will be your constant companion as you
unlock the many mysteries of life through various learning
experiences. Moreover, this book will teach you how to apply the
wonders of science to your day-to-day activities.
Let this book help you find the answers to the questions
you have about yourself, your world, and your universe. Let this
take you a step closer to understanding life and in discovering the
wonders of science!
4. Unit 1 Your Body
Chapter 1 Your Senses
Lesson 1 The Things around You .............................................................2
Lesson 2 What Do You See? ....................................................................8
Lesson 3 What Do You Hear? ................................................................13
Lesson 4 What Do You Smell? ...............................................................18
Lesson 5 How Does It Taste?..................................................................22
Lesson 6 What Do You Feel? .................................................................27
Lesson 7 Your Sense Organs Work Together ..........................................31
Think Back ............................................................................................... 35
Measure Up! ............................................................................................... 36
Chapter 2 Your Body’s Needs
Lesson 1 Food That Makes You Grow ....................................................37
Lesson 2 Food That Makes You Go ........................................................41
Lesson 3 Food That Makes You Glow ....................................................44
Lesson 4 Healthy Eating Habits ..............................................................48
Lesson 5 You Are Growing ....................................................................52
Lesson 6 Things That You Can Do Now ................................................55
.
Think Back ............................................................................................... 59
Measure Up! ............................................................................................... 59
Unit 2 Wonders of Nature
Chapter 3 The Animal Kingdom
Lesson 1 How Animals Move.................................................................62
Lesson 2 How Animals Eat ....................................................................67
.
Lesson 3 Animals Need Air ....................................................................71
Lesson 4 Animal Defenses .....................................................................74
5. Lesson 5 Animals of the Same Kind Have Similarities and Differences ...79
Lesson 6 Animals of Different Kinds Have Similarities ...........................83
.
Lesson 7 Young Animals and Their Parents ............................................87
Lesson 8 Taking Care of Animals ...........................................................93
Think Back ............................................................................................... 97
Measure Up! ............................................................................................... 97
Chapter 4 The Plant Kingdom
Lesson 1 Plants Grow ............................................................................99
.
Lesson 2 Young and Mature Plants ......................................................103
.
Lesson 3 Plants of the Same Kind Have Similarities and Differences ....106 .
Lesson 4 Some Plants Bear Flowers and Fruits .....................................110
.
Lesson 5 Basic Needs of Plants ............................................................116
Lesson 6 Uses of Plants ........................................................................123
Think Back ............................................................................................. 128
Measure Up! ............................................................................................. 128
Unit 3 Matter and Energy
Chapter 5 Matter and You
Lesson 1 Matter around You ................................................................132
Lesson 2 Phases of Matter ....................................................................136
Lesson 3 Shape and Volume of Solids ..................................................139
Lesson 4 Mass of Solids .......................................................................143
.
Lesson 5 Liquids Take up Space ...........................................................147
Lesson 6 Mass of Liquids......................................................................151
Lesson 7 Gas Takes up Space ..............................................................154
.
Lesson 8 Gas Has Mass ........................................................................157
Think Back ............................................................................................. 160
Measure Up! ............................................................................................. 161
6. Chapter 6 Energy around You
Lesson 1 Light and Heat ......................................................................164
.
Lesson 2 Light Travels ..........................................................................172
Lesson 3 Luminous and Nonluminous Objects ....................................175
Lesson 4 Sound Is Everywhere .............................................................178
Lesson 5 Magnets Can Attract Other Objects .......................................182
Think Back ............................................................................................. 185
Measure Up! ............................................................................................. 185
Unit 4 Earth and Beyond
Chapter 7 Earth, Weather, and You
Lesson 1 Earth and Its Landforms .........................................................188
Lesson 2 Earth and Its Bodies of Water .................................................193
Lesson 3 Earth Gives Useful Things .....................................................198
.
Lesson 4 Natural Events That Change Earth ..........................................204
Lesson 5 Human Activities That Change Earth .....................................209
.
Lesson 6 Taking Care of Mother Earth ..................................................213
Lesson 7 Different Kinds of Weather ....................................................220
Lesson 8 Weather Report .....................................................................225
Lesson 9 Observing Safety Measures during Bad Weather ...................229 .
Think Back ............................................................................................. 233
Measure Up! ............................................................................................. 233
Chapter 8 The Solar System
Lesson 1 Earth’s Nearest Neighbor .......................................................235
Lesson 2 The Bright Sun ......................................................................239
.
Lesson 3 The Sun and Its Family ..........................................................243
Think Back ............................................................................................. 246
Measure Up! ............................................................................................. 247
Bibliography .................................................................................................. 249
.
7. Unit 1
Your Body
Your body has parts that help you do things. You see
beautiful places through your eyes. You hear sounds because of
your ears. You smell the scent of flowers in your garden because
of your nose. You can taste food because of your tongue. You can
feel your pillow because it touches your skin.
You should take good care of your body. One way to keep
your body strong and healthy is to eat the right kind and amount
of food.
8. Chapter 1
Your Senses
Your sense organs help you collect information about the
things in your surroundings. They send all these information to
your brain. Without your sense organs, you will not be able to see,
hear, smell, taste, and feel anything.
Lesson 1
The Things around You
Find Out
1. What are your sense organs?
2. Where do sense organs send all
the information they get from the
surroundings?
One sunny Saturday afternoon, Gino
and Lea went
to the park. As
they were walking, they felt the rough
pebbles underneath their shoes.
“Oh, my! It’s so hot today!” Gino
cried out.
“Tweet! Tweet! Tweet!” Lea and
Gino heard the birds singing. They ran
to the trees where the birds were. But
the birds quickly flew away.
Smart Science 2
9. As they continued to walk, Gino and Lea suddenly felt thirsty
and hungry. They decided to go to Nina’s house.
When they were nearing Nina’s house, they smelled
something. “Hmmm! I smell sopas,” Gino said.
“I smell banana cue,” Lea added.
“Yum . . . yum . . . yum . . .
This sopas is delicious!” Gino
said as he sipped it. “This
banana cue also tastes great!”
Lea said.
Do you know what makes
you see, hear, smell, taste, and
feel? Your body has sense organs that collect information about
what you see, hear, smell, taste, and feel. These sense organs
send the information to your brain. Your brain
then tells you what you have seen, smelled,
tasted, heard, and felt.
You can tell how objects look
by their colors, sizes, or shapes
using your eyes.
You can describe and
know objects by their smell
using your nose.
Your Body
10. You can also describe and know
objects by the sounds they make using
your ears.
You can describe the objects
by their taste using your tongue.
These tastes can be sweet, bitter,
sour, salty, or umami.
You can describe and
know objects by touching
them. You can feel smooth
and rough objects using
your skin.
Smart Science 2
11. Explore
Sense It!
1. There are five small boxes on
the table. The boxes labeled
A, B, C, D, and E contain one
object each.
2. Pick out the object from Box A. What is the object?
Describe it using your eyes.
3. Shake Box B. What do you
hear? Guess what the object is.
4. Smell Box C. What is the object
inside it?
Note: If you are asthmatic, skip this
step.
5. Get a partner and let him
or her blindfold you. Your
partner will pick an object
from Box D and will let you
taste it. What does it taste
like? What is the object?
Your Body
12. 6. Touch the object inside Box E. Is the object smooth or
rough? What is the object?
7. Which sense organ did you use to identify the object in
each box?
Box Sense Organ
A
B
C
D
E
Keep in Mind
Your sense organs gather information from your surroundings
which they send to your brain. Without them, you cannot see,
hear, smell, taste, and feel anything.
Smart Science 2
13. Challenge Yourself
List five things that can be found in the classroom. Describe
each using the table below. Name the sense organs you used to
describe each object.
Taste
Sound Texture
Size Smell (sweet,
Produced (rough
Object Color (big or (pleasant or sour, bitter, Shape
(loud or or
small) unpleasant) salty, or
soft) smooth)
umami)
1.
2.
3.
4.
5.
Sense organs used:
Object 1 _______________________________________________
Object 2 _______________________________________________
Object 3 _______________________________________________
Object 4 _______________________________________________
Object 5 _______________________________________________
Your Body
