Smstx2

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Smstx2

  1. 1. Smart Science 2 Textbook
  2. 2. Smart ScienceGrade 2TexTbookPhilippine Copyright 2009 by DIWA LEARNING SYSTEMS INCAll rights reserved. Printed in the PhilippinesEditorial, design, and layout by University Press of First AsiaNo part of this publication may be reproduced or transmitted in any form or by any meanselectronic or mechanical, including photocopying, recording, or any information storage andretrieval 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 978-971-46-0087-4RevieweRMarina Balce was a former assistant dean and associate professor at the College of Education, LaSalle College–Antipolo. She taught biological sciences for Psychology students and thesis writing forgraduating Education students in the same college. She was also a Trainee of the Japan InternationalCooperation Agency (JICA) at the Aichi University in Nagoya, Japan, where she attended a specialtraining on Practical Work in Elementary School Science. Dr. Balce finished her bachelor’s degree inSecondary Education major in Biology at the University of the East–Manila. She has a master’s degreein Biology Education from the De La Salle University–Manila and a doctorate in Science Educationmajor in Biology from the University of the Philippines–Diliman.
  3. 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. 4. Unit 1 Your BodyChapter 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! ............................................................................................... 36Chapter 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! ............................................................................................... 59Unit 2 Wonders of NatureChapter 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. 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! ............................................................................................... 97Chapter 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! ............................................................................................. 128Unit 3 Matter and EnergyChapter 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. 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! ............................................................................................. 185Unit 4 Earth and BeyondChapter 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! ............................................................................................. 233Chapter 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! ............................................................................................. 247Bibliography .................................................................................................. 249 .
  7. 7. Unit 1 Your Body Your body has parts that help you do things. You seebeautiful places through your eyes. You hear sounds because ofyour ears. You smell the scent of flowers in your garden becauseof your nose. You can taste food because of your tongue. You canfeel your pillow because it touches your skin. You should take good care of your body. One way to keepyour body strong and healthy is to eat the right kind and amountof food.
  8. 8. Chapter 1 Your Senses Your sense organs help you collect information about thethings in your surroundings. They send all these information toyour 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 Out1. 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. 9. As they continued to walk, Gino and Lea suddenly felt thirstyand hungry. They decided to go to Nina’s house. When they were nearing Nina’s house, they smelledsomething. “Hmmm! I smell sopas,” Gino said.“I smell banana cue,” Lea added. “Yum . . . yum . . . yum . . .This sopas is delicious!” Ginosaid as he sipped it. “Thisbanana cue also tastes great!”Lea said. Do you know what makesyou see, hear, smell, taste, andfeel? Your body has sense organs that collect information aboutwhat you see, hear, smell, taste, and feel. These sense organssend the information to your brain. Your brainthen tells you what you have seen, smelled,tasted, heard, and felt. You can tell how objects lookby their colors, sizes, or shapesusing your eyes. You can describe and know objects by their smell using your nose. Your Body
  10. 10. You can also describe and knowobjects by the sounds they make usingyour 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 andknow objects by touchingthem. You can feel smoothand rough objects usingyour skin. Smart Science 2
  11. 11. ExploreSense 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. 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 surroundingswhich they send to your brain. Without them, you cannot see,hear, smell, taste, and feel anything. Smart Science 2
  13. 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 (roughObject 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

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