Test your self

Put a tick (V) for the correct statement and a cross (X) for the wrong statement.

1. Cows take care of their young.     (     )
2.Hens do not take care of their eggs and young.     (     )    
3.Birds feed their young.   (      )
4.Most animals that do not take care of their young lay a lot of eggs.  (     )  
5. Species are different types of living things that can breed among themselves. (     )      

Survival of the species

Animals need to reproduce to prevent their species from extinction. Animals reproduce by eggs or giving birth. Different animals have their own ways to ensure the survival their species.

1. Snake coils round the eggs and attacks animals that come close to the eggs.

2.Sea horse

The male sea horse use its pouch to store the eggs and looks after them until the hatch. It will protect the young until they can fend for themselves.

3.Siamese fighting fish

The male fish catches the eggs in its mouth and drops them into a bubble nest that it has built. It also guards the nest and protects the babies.

4. Kangroo carry their young in their pouches

                              

Effect of heat

Q: This ping-pong is dented! Do i have to throw it away?

A: No, you can put it in hot water.The air in the ping-pong ball will expand and the dent on the ball will be gone.

When a dented ping-pong ball is placed in a bowl of hot water, the air in the ping-pong ball will absorb heat and expand. As the air expand, it will push the dent outward making the ball return to its original shape.

Light

1. Light is a form of energy.
2. Light travels in a straight line.
3. Light cannot pass through opaque or translucent objects.
4. When light is blocked by opaque or tranlucent objects, shadows are formed.
5. Light can pass through transparent objects. 
6. The nearer the object is to the screen, the smaller is the shadow on the screen.
7. The nearer the object is to the source to light, the larger is the shadow on the screen.
8. A sharp image is formed when the light is reflected from a smooth and shiny surface.
9. Aburred image is formed when the light is reflected from a rough surface.
10. The most important use of light reflection is that it enables to see things that are difficult to look at directly.

Heat

Fill in the blanks with the correct answers.

     The instrument is shown in the picture is  _____________. It  has a small bore containing ____________________ liquid. This instrument is used to measure ___________. It is measured in degree __________. It the object gets hot, the temperature ____________. if the object gets cold, the temperature ____________. The standard unit for temperature is _________.

团结就是力量

当一只海龟遇到两条鱼，会发生什么事？

Like other reptiles, turtles lay eggs which are slightly soft and leathery. Large numbers of eggs are deposited in holes dug into mud or sand. They are then covered and left to incubate by themselves. 

谁是大赢家？

        有一天，一只蜈蚣在窝里爬行，突然迎面来了一只蜘蛛，结果会如何呢？

         请看一看就有答案。

Change of color

     Some chameleon species are able to change their skin coloration. different chameleon species are able to vary their colorationdan pattern through combinations of pink, blue, red, orange, green, black, brown, light blue, yellow,  and purple.

    Color change in chameleons has functions in social signaling, in reaction to temperature and other conditions, as well as in camouflage. The relative importance of these functions varies with the circumstances as well as the species.Color change signals as a chameleon"s physiological condition and intentions to other chameleons. chameleons tend to show darker colors when angered, or attempting to scare or intimidate others, while males show lighter, multi colored patterns when courting females.

process of chicken hatches

Dispersal of fruit and seeds

1. Fruits and seeds that are dispersed by water

                         

 Fruits and seeds that are dispersed by wind

3.Fruits and seeds that are dispersed by animals

                             

4 .Fruits and seeds that are dispersed by explosive mechanism

                    

Test yourself

Fill in the blanks with the correct words:

       kinetic    renewable       source

           wind       non-renewable    

1. An example of a source of renewable energy is the ________.
2. The Sun is the main ______ of energy.
3. The bouncing rubber ball has ______energy.
4. ________ energy can be replenished.
5. __________energy cannot be replenisher after it has been used up.

The various form of energy

                      sound  energy 

                         

    chemical energy

kinetic energy

electrical energy

   

light energy

Test Yourself

Fill in the blanks with the correct word as below:

     wet   series    insulators    dry cell     symbols

1. Electrical components in an electrical circuit can be represented by ____________.
2. Electricity can only flow in one path in _______ circuits.
3. In a _________, chemical energy is changed into electrical energy.
4. Connecting wires are coated with _________.
5. We must not handle electrical appliances it our hands are________.

Electrical circuit

Compare the brightnes of bulbs in the parallel and series circuits

                                                           a) Paraller circuits

                                    b) series circuits

1) In which circuit, the bulbs will lit up brighter ?
    ________________________________________

2) State one disadvantage of a series circuit as compared to a     parallel circut.
   _______________________________________________

3) In this fair test, state the things that are:
    i) change   :_______________________
   ii) observed:_______________________

4) What can you conclude in this fair test ?
   ________________________________________________
      

animals facts

Can Rabbits and parrots see behind themselves without even moving their heads?

Answer：
Yes，although not directly behind themselves. Rabbits and parrots have a wider range of vision than humans, although much less of their vision field is “binocular” – this means they don't have depth perception, and that's why they are always moving their heads around, so they can see what they are looking at from different angles.

有趣的动物

小熊猫是一种珍稀的植食哺乳动物，身材比家猫稍大，达到了大约55  厘米。它长有和大熊猫一样能缩回的爪子，还有由手腕关节骨头伸长发育成 的伪大拇指。小熊猫的脚底长有厚厚的毛，可以用来抵御寒冷并且隐藏汗腺。

有趣的动物

艾艾狐猴是一种生活在马达加斯加的奇怪动物，它长有尖利的牙齿和细长的趾爪，其中指尤其锋利，可以钻开木头。艾艾狐猴使用中指挖开树木，寻找其中的 虫子作为食物，艾艾狐猴是本家族中唯一的一种。

叶海龙的名字源于中国古代的神话故事，它的样子就像一片漂浮在水中的藻类，叶海龙可以呈现绿、橙、金等体色，它全身由叶子似的附肢覆盖， 使其伪装性极强。只有在摆动它的小鳍或是转动两只能够独立运动的眼珠时才会暴露行踪。

Science Year 5 -Unit 2 Survival of the Species

Mammoths and dinosaurs are examples of animals that no longer exist. 

• Is it because of their gigantic size ? 
• Elephants look similar to mammoths. Why are they still surviving?

Rafflesia is an example of a plant species found in Malaysia that is facing extinction. 

• Why it happens?
• How do animals and plants ensure the survival of their species?

Conclusion: Shortage of food can cause extinction of species.

INSPIRING QUOTE 

A teacher who is attempting to teach without inspiring the pupil with a desire to learn is hammering on cold iron.-Horace Mann-