DUNIA SAINS & TEKNOLOGI TAHUN 2

DUNIA SAINS & TEKNOLOGI TAHUN 2

NOTA RINGKAS DST TAHUN 2

1)KEPERLUAN ASAS MANUSIA

    - Udara, Air, Makanan, Tempat perlindungan

2) PIRAMID MAKANAN - MAKAN SECARA SIHAT

3)Bahagian Tubuh Haiwan

-Bahagian Tubuh Haiwan- Badak Sumbu & Kucing

Bahagian Tubuh Haiwan - Siput

Cara Pemakanan Haiwan

4) KITAR HIDUP KATAK

KITAR HIDUP RAMA_RAMA

BAGAIMANA PROSES HIDUP RAMA-RAMA

KITARAN HIDUP RAMA-RAMA

Daripada sebiji telur kecil ( TELUR ), lahirlah seekor ulat bulu ( LARVA ). Ulat bulu ini mempunyai nafsu makan yang menakjubkan selama dua atau tiga minggu. Kemudian, ulat bulu itu mencari tempat untuk bergayut.  Ini menandakan bermulanya satu lagi kejadian hidup rama-rama .Ulat bulu itu akan menjadi seekor kepompong atau ( PUPA ). Kepak dan kakinya akan terbentuk. Akhirnya, jadilah seekor rama-rama ( DEWASA ). Dengan adanya 4 peringkat diatas, maka lengkaplah kitaran hidup seekor rama-rama.

5) Tempat Perlindungan Haiwan

TUMBUHAN

• Keperluan asas tumbuhan ialah air, udara dan cahaya matahari.
•  Tumbuhan memerlukan air, udara dan cahaya matahari untuk membuat makanan. 
• Tumbuhan hijau membuat makanannya sendiri melalui proses fotosintesis 
• Tumbuhan juga memerlukan air untuk mengangkut makanan dan nutrien. 
• Tumbuhan memerlukan udara untuk bernafas dan membuat makanan. Tumbuhan hijau menyerap cahaya matahari melalui daun-daunnya untuk membuat makanan

TUMBESARAN POKOK JAGUNG

Perubahan pada pokok jagung semasa mengalami tumbesaran

Cahaya

  

Video

Video 1

Video 2

Video 3

 

Experiment

Experiment

Experiment 1: Light travels in straight lines

When you turn on a torch, it produces a ray of light which travels in a straight line. In this experiment study how light travels only in straight lines.

Materials:

·         Work Surface

·         Thin A4 Card (Any Colour)

·         Scissors

·         Modeling Clay or Sticky Tack

·         Torch

·         Small Mirror

Methods:

1.      Carefully cut a piece of A4 card in half

2.      Hold the pieces together and cut a slot 5cm deep in one of the long edges

3.      Stand one of the pieces of card on its slotted edge.

4.      Support it with four pieces of sticky tack or modeling clay near the corners.

5.      Stand the other piece of card on its slotted edge parallel to the first piece and about 15 cm away from it.

6.      Support it with four pieces of modeling clay.

7.      The slots in the cards should be roughly opposite each other.

8.      Switch off the lights or close the curtains to make the room dark.

9.      Shine a torch through one of the slots from about 10cm away.

10.  Move the torch from side to side to make the ray pass through both slots.

11.  Replace one piece of card with a mirror, with its reflecting side facing the remaining card.

12.  Shine the torch through the slot towards the mirror.

General Safety Tip

Be careful when handling sharp objects such as scissors. Make sure the sharp objects ‘point-away’ from your body. Have an adult nearby when you do this experiment.

Mirrors can have sharp edges, especially when broken. Be careful when using them.

Useful Links

http://www.youtube.com/watch?v=Hh4lregaYes

http://www.youtube.com/watch?v=WrQsq8s8XzU

Experiment 2: Sunlight

Plants need food and water or they will wilt and die. Because plants cannot move around, they need to grow in a place where they can get sunlight, water and air. If a plant is growing in a dark, shady place, it will work very hard to grow towards the Sun because without sunlight, a plant cannot make food. Study the growth of plants towards sunlight by using another plant without sunlight as a control. 

Materials:                                                                       

·         A shoe box with lid

·         Some card

·         Sticky Tape

·         Scissors

·         A potato that has ‘eyes’ or buds, from which a shoot will grow.

Methods:

1.      Make a small hole in one end of the shoe box, just big enough to let in a little light. Cut three strips of card a bit shorter than the width of the box.

2.      Turn back one end of each strip to make a flap. Tape the flaps to the sides of the box.

3.      Put the potato at the other end of the box from the hole you have cut, and put on the lid. Place the box in a well-lit, airy position.

4.      The potato is full of stored food, so the new plant doesn’t need soil or water to start growing. After a few days, the potato will start to grow a shoot. The shoot will bend its way through the maze towards the light.

What’s happening?

As shown in this experiment, if you plant a bean upside down in soil, the shoots will always find their way towards the light, even if it means they have to wind their way around other things. Sunlight is essential for a plant’s survival. This is because plants use sunlight to make food in a process called photosynthesis. Green leaves use energy from the Sun to make food from water and from a gas in the air called carbon dioxide. The food, called glucose, is carried through tubes to the rest of the plant. In the final stage of photosynthesis, oxygen is released into the air.

General Safety Tip

Be careful when handling sharp objects such as scissors. Make sure the sharp objects ‘point-away’ from your body. Have an adult nearby when you do this experiment.

Useful Links

http://www.youtube.com/watch?v=v5F51oOR8cc

http://www.youtube.com/watch?v=kKNM-MF81v8

Experiment 3 :Which Type of Sponge Holds the Most Water?

Objective:

We are going to find out which type of sponge holds the most water.

Research Questions:

What factors determine how much water a sponge will hold?

Sponges are useful for cleaning as it holds moisture. They are porous, which means they have tiny holes in them that allow cleaning fluid or water to be held. This does the cleaning job much more quickly than you bare hands or even a wash cloth.

Materials:

Choose sponges of relatively the same size

Natural Sponges

·         Cellulose

·         Sea Sponge

Artificial Sponges

·         Polyurethane

·         Polyether (those rainbow packs)

·         Polyester

Water

Large Bowl(s)

Measuring Beaker

 

Experimental Procedure

1.      Take one sponge and press it inside a bowl full of water. Let it drain a little.

2.      Squeeze the sponge until all of the water comes out in a measuring beaker. Record this measurement.

3.      Do the same for all the other sponges.

4.      Evaluate which one held the most water.

5.      Examine and compare the sponges and try to understand what properties might help one hold more water than another.

*Note: You may want to repeat this experiment for a few trials to be accurate.*

Suggested Chart

Amount of Water Held

	MATERIAL	Trial #1	Trial #2	Trial #3
NATURAL SPONGES	Cellulose
	Sea Sponge
ARTIFICIAL SPONGES	Polyurethane
	Polyether
	Polyester

Terms/Concepts: Sponge; Porosity; Absorbency

References:

·         Animals: Sponges

·         Earth Science: Porosity and Permeability

LATIHAN SAINS TAHUN 2

A.Tandakan ( √ ) pada jawapan yang betul.                   [  3 x 2 = 6 markah ]                     

1. Apakah keperluan asas tumbuhan ini ?

B. Padan cara haiwan bergerak                                          [  8 x 2 =16 markah   ]

C. Warnakan keperluan asas bagi setiap yang berikut.       [ 7 x 2 = 14 markah ]

Manusia

            

    

      D. Kelaskan haiwan-haiwan mengikut makanan yang dimakan.

                                                                                                           [9 x 2 = 18  markah]

  

Makan haiwan sahaja	Makan tumbuhan sahaja	Makan haiwan dan tumbuhan

     

F.Jawab Soalan berikut dengan jawapan yang sesuai.        [  6 X 4 = 24  markah ]

Ali  memelihara seekor ikan di dalam balang.

Apakah yang dapat kamu  perhatikan ?      

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