Investigation on three slices of mango.

A group of students are carrying out an investigation on three slices of mango. The results are recorded as follows:



1) What is the investigation about?
....To show that preserved food can be kept for a longer time.

2) In the investigation above, what is
.....changed? The method of keeping the mangoes.
.....observed? The condition of the mango after some time.

3) Why does Y turn slimy after the fifth day?
.....Due to the presence of bacteria.

4) What is the method used to preserve
.....W? Pickling
.....X? Cooling

Model cars.

A group of pupils carries out an activity using model cars.
The bar chart shows the information they have obtained.


1) What is the aim of the investigation?
.....To investigate the relationship between the number of batteries and the speed of the model cars.

2) State two variables in the investigation.
.....Speed
.....Number of batteries

3) What is the relationship between the variables that you have mentioned in (2)?
.....The more the number of batteries used, the greater the speed of the model cars.


4) What conclusion can you make based on the bar chart?
.....The number of batteries affect the speed of the model cars.

Investigaion on the cooling of 500 ml of water.

Table shows the result of an investigation on the cooling of 500 ml of water.

1) What is the purpose of the investiagation?
To investiagate the relationship between the time of hot water left to cool and the rate of decreasing temperature.

2) Suggest one reason why the water cools.
.....Heat is released to the air.

3) Predict the water temperature at the 9th minute.
.....60 degrees centigrade

4) What conclusion can be made from the investigation?
.....When hot water is left to cool, the temperature of the water will decrease and remains constant.

Rubber Band

Rose has two rubber bands, X and Y. X and Y are of the same length.
she carries out an investigation using the rubber bands. Each rubber band is hung with an identical cup. Diagram shows the result of the investiagation.







1) State two inference about the length of rubber band Y.
.....Rubber band Y is made of elastic material.
.....Rubber band Y has higher elasticity.


2) Write one observation to support your inferences in (1).
......Rubber band Y becomes longer when hung by a cup.

Rose heats rubber band X as shown in Diagram.

After heating, it is found that rubber band X has elongated to 30 cm.

3）Write one hypothesis based on the information.
......The more heat is provided to rubber band X, the longer the rubber band becomes./
......Rubber band X becomes longer when heated.

Comparison between sizes of diferent living things

Diagram shows the comparison between sizes of diferent living things.

In this investigation, a group of pupils gather information in Table1.

1) State two variables in the investigation
....Living Things
....The number of resting heart beats

2) Based on the information, write one statement relating the two variables.
....The larger the living thing, the lesser is the number of the resting heart beats.

3) Estimate the number of resting heart beats per minute of an adult cow.
.....40-60

When Amin is resting, his heart beat is at 70 times per minute. After running, his heart beat is at 80 times per minutes.

4) Write one hypothesis based on the statements above.
.....Performing any physical activities will increase the number of heart beats.

Chicks in box

Diagram 1 shows two different boxes, j and k. Each box has 8 holes punches in the sides. A farmer puts 20 chicks in box J and 12 chicks in box K.

Table 1 shows the result of this investigation after four hours.

1) State one reason (inference) based on these information.
....Chicks in box J did not get enough space.

2) Write one observation on the condition of the chicks in box J to support the answer in 1.
.....The chicks getting weaker/not active.

The chicks in box K are transferred to box L as shown in Diagram 2. Box L is similar to box K but is has only four holes punched by the sides.

3) Predict what happen to the chicks after four hours.
.....A few chicks will die.

4) State one variable that was kept the same (constant) in this investigaton.
.....Type of chicks / Size of chicks/ Number of box

Size of animals / Amount of food needed per day

A group of pupils gathered information about the amount of food needed by various types of animals. Table above shows the result of this investigation.

1) State one information gathered in this investigation.
....Size of animals / Amount of food needed per day.

2) What conclusion can be made from the information in Table?
.....The bigger the size of animals, the amount of food needed per day increases.


The food needed by an animal per day is affected by its surrounding temperature and its activity level.


3) State one hypothesis假设 based on the above statement.
....The more active the animal is, the greater is the amount of food needed per day. / The higher the surrounding temperature, the greater is the amount of food needed per day.

caterpillars 毛虫 and sparrows麻雀

Lina carried out a study to find out the relationship between sources of food and the number of consumers 消费者.
The study involved caterpillars 毛虫 and sparrows麻雀 in the school garden. The study took four weeks.
The observations are recorded in the following table:

1) State the aim of the investigation.
....To investigate the relationship between sources of food and the number of consumers.

2) What is the trend of change in the number of sparrows?
.....Increasing

3) What conclusion can you make based on the observations?
.....As the number of sparrows increases, the number of caterpillars decreases.

4) Predict the number of caterpillars on the 5th week.
....12 caterpillars

Inhalation Process

1) Name the organs below.
....X: Windpipe
....Y: Lungs

2) Predict the process shown in the diagram.
.....Inhalation 吸入

3) What will happen when the air reaches Y.
.....Oxygen will be absorbed吸收.

Different animals have different specific characteristics

1) Predict the habitat of animal A.
.....In the desert

2) Determine the animals below.
.....A: Camel B: Lion/Tiger C: Porcupine / Hedgehog D: Elephant/Rhinoceros

3) What can animal C do with its specific characteristics?
.....To keep enemies away / To protect itself.

4) Make a conclusion based on the above investigaiton.
.....Different animals have different specific characteristics to protect themselves from danger and extreme weather.

Living things that live in different habitats

Diagram shows two living things that live in different habitats.

1) Name the breathing structure of these two living things.
.....Animal Y: Lungs
.....Animal X: Trachea structure

2) Name one living thing that has the same breathing structure as animals X and Y respectively.
.....Animal X: Dog (or any relevant answer)
.....Animal Y: Grasshopper (or any relevant answer)

3) What is the breathing structure of a crab?
.....Book Lungs

4) Exhaled air contains more gas P. What is gas P?
.....Carbon dioxide.

The purpose of using silica gel 使用二氧化硅凝胶的目的

1) what is the aim of this investigation? 这项的试验的目是什么？
....To investigate the response of plants to water 为了研究植物对水的反应.

2) What is the purpose of using silica gel in the apparatus set-up?

这项试验中，使用二氧化硅凝胶的目的是什么？
....To obsorb moisture that might be present in the beaker

....为了吸收烧杯里可能存在的湿气。

3) In this investigation, identify what is 这项试验中，确认
....changed 须改变的事项：The present of water 水的存在。
....observed 须观察的事项：The direction of root growth 根的生长方向。

Gas jars and the burning time of the candles.

1) What is the aim of this investigation? 这项试验的目的是什么？
.....To investigate the relationship between the contents of the gas jars and the burning time of the candles.
.....为了研究气体瓶子里所含之物和蜡烛所燃烧的时间之间的关系。


2) In this investigation, identify what is : 在这项试验中，确认 :
....changed : 须改变的事项：The content of the gas jars 气体瓶子里所含之物。
....observed: 须观察的事项：The burning time of the candles 蜡烛燃烧的时间。


3) State one thing that is kept the same. 说明一项固定的事项。
.....The volume of the gas jar / the type of candles 气体瓶子的体积/蜡烛的种类


4) What can be concluded from this investigation? 从这项试验中可作出什么结论？
....Inhaled air contains more oxygen than exhaled air.

....吸入的空气比呼出的空气含有较多的氧气。

tadpoles / 蝌蚪

1) What can be observed after five days?
....The tadpoles(蝌蚪) in beaker S died. The tadpoles in beaker T are still alive.

2) Write one reason to explain your answer in (1)
.....The oil layer in beaker S prevents(防止) the air from dissolving(溶化) in the water, the tadpoles do not have oxygen supply(供应).

3) What can be concluded in this experiment?
....Tadpoles need air to stay alive.

4) Name two other basic needs of the tadpole.
.....water and food

The young of animal is formed inside the mother's body.

Animal P lives in the sea.
The young of animal P is formed inside the mother's body.

1) Based on the information above, how does animal P reproduce?
....Give birth

2) Write one animal based one the information above.
.....Whale 鲸鱼

Mosquitoes and cockroaches have different life cycles.

1) Explain the statement above (make inference)
.....Mosquitoes undergo four stages of life cycle
.....Cockroaches undergo three stages of life cycle.

2) Write the life cycle of a mosquito.
.....Egg->Larva->Pupa->Mosquito

human's excretory(排泄) organ

1) List the waste products excreted by the above organ.
.... Excessive water, mineral salts and urea(尿素).

2) Based your answer in (1), name one other organ that excretes the same waste products.
.....Skin

3) What will happen when the organ in above is not able to function properly？
.....The toxic (毒性)will remain in the body and cause death eventually.

A chick is just hatched from the egg.

1) How does the hen reproduce?
.....Lay eggs

2) Name one other animal that reproduces in the same way as the animal in above.
.....Turtle

Living in extreme weather

snake 蛇
camel 骆驼
sea lion 海狮
frog 青蛙
penguin 企鹅
reindeer 驯鹿
whale 鲸鱼
squirel 灰鼠
wild goose 野生鹅
honey ant 蜂密蚂蚁

How do these animals protect themselves from extreme weather? Classify them into the correct groups.

- Has special body parts to store water:
...camel, honey ant

- Has thick layer of fat:
...penguin, sea lion

- Migrate:
...wild goose, whale, reindeer

- Hibernate:
...snake, squirrel, frog

Human System

1) Name the system.
.....Excretory System.

2) Name the part of X, Y and Z.
.....i) X: Skin
....ii) Y: Lung
....iii) Z: Kidney

3) State two wastes that are excreted by the human lungs.
.....Water vapour and carbon dioxide.