F2 IS QZ 04 anwers

Marks: =       /22 =    %

1st Term QZ 04 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

7.2

Word Translation (7 marks)

i    Write down the English terms of the following Chinese terms:

	Chinese term	English term
1	火三角	Fire triangle
2	燃料	Burning
3	熄滅	Go out
4	高溫	High temperature
5	必須條件	Necessary conditions
6	氧	Oxygen
7	發生反應	React

Fill in the Blanks (13 marks)

1      Burning is a chemical process involving fuel and oxygen.

2      When fuels burn in air, they react with oxygen and produce carbon dioxide and water. Light / heat energy and heat / light energy are given out.

3      The word equation of burning is:

                Fuel + oxygen ---------------à carbon dioxide + water + energy

4     Fuel, oxygen and a sufficiently high temperature are the necessary conditions of burning. They form the fire triangle. That means fire will go out if any one of them is removed.

Multiple Choice (2 marks)

1.      Water and carbon dioxide can be used to put out a fire. Which of the following correctly shows what they remove from the fire triangle?

	Water	Carbon dioxide
A.	Fuel	Oxygen
B.	Oxygen	Fuel
C.	Temperature	Oxygen
D.	Fuel	Temperature

5.     We should NOT use water to put out certain kinds of fires. What are they?

(I)      Burning oil

(II)    A fire caused by leakage of electricity

(III)   A hill fire

A.   (I) and (II) only     B.    (I) and (III) only    C.    (II) and (III) only   D.    (I), (II) and (III)

Challenging Questions (Bonus 2 marks)

Explain how we can put out the fire of burning oil.

We can use a pan cover / fire blanket to cover the fire (1) because this can stop the supply of oxygen to burning (1).

F2 1st Term IS WS 10 Answers

1st Term WS 10 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

7.5       Gaseous exchange between living

             things and the environment

i      Words to know:

	English term	Write the words again	Chinese term
1	Gaseous exchange	Gaseous exchange	氣體交換
2	Lungs	Lungs	肺
3	Respiration	Respiration	呼吸作用
4	Photosynthesis	Photosynthesis	光合作用
5	Greenhouse effect	Greenhouse effect	溫室效應
6	Global warming	Global warming	全球暖化

i      Matching:

Gaseous exchange	•	through which gases are taken in from and released to the environment.
Global warming	•	is caused by an excessive greenhouse effect.
Greenhouse effect	•	traps some of the heat from the sun to keeps the Earth warm.
Lungs	•	are parts of our breathing system for gaseous exchange.
Photosynthesis	•	is the process which produces food in green plants.
Respiration	•	is the process which releases energy in living cells.

i      Fill in the blanks:

1       Breathed air contains more carbon dioxide and less oxygen than unbreathed air.

2        Gaseous exchange occurs continuously between our body and the environment, through which animals (and plants) take in oxygen from air and release carbon dioxide to the environment.

3        In humans, gaseous exchange occurs inside the lungs.

4        During daytime, green plants consume carbon dioxide and produce oxygen in photosynthesis. In other words, green plants carry out photosynthesis at a faster rate than respiration.

                Amount of oxygen                                        Amount of oxygen
          produced in                         ­more / less      absorbed in
          photosynthesis                       than                respiration

           Therefore, it has a net uptake / release of oxygen.

                     Amount of carbon                                     Amount of carbon
           dioxide absorbed for           ­more              dioxide produced in
             photosynthesis                    than                  respiration

          Therefore, it has a net uptake of carbon dioxide.

5       At night, photosynthesis stops but respiration goes on in green plants. Therefore, they have net uptake of oxygen and net release of carbon dioxide.

6       The contents of oxygen and carbon dioxide in nature are kept more or less constant. This is known as the balance of oxygen and carbon dioxide in nature.

7       Greenhouse effect is the phenomenon that carbon dioxide (and some other gases) in the atmosphere traps some of the heat from the Sun and keeps the Earth warm.

8       The increasing amounts of carbon dioxide in the atmosphere lead to an excessive greenhouse     effect and hence global warming.

F2 1st Term IS WS 09 Answers

1st Term WS 09 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

7.4       How do green plants obtain energy?

D. Importance of photosynthesis to animals (P.46-47)

i      Words to know:

	English term	Write the words again	Chinese term
1	Photosynthesis	Photosynthesis	光合作用
2	Producers	Producers	生產者
3	Consumers	Consumers	消費者
4	Food chains	Food chains	食物鏈

i      Matching:

Photosynthesis	•	is the process which converts light energy into chemical energy.
Producers	•	provide food for all animals either directly or indirectly.
Consumers	•	are the animals which feed on plants or other animals.
Food chains	•	show the feeding relationships between plants and animals.

i      Fill in the blanks:

1        Green plants can make their own food by photosynthesis. In this process,

           light energy is converted into chemical energy which is stored in starch / food.

2        Green plants are producers because they can make their own food and provide food for all animals either directly or indirectly.

3       Animals cannot make their food and must feed on plants or other animals, so they are called consumers.

4        The feeding relationships between plants and animals can be shown by food chains.

i      Short questions:

1       State the producer(s).                    Grass

2       State the consumer(s).        Sheep, lion

3       Draw a food chain to show the feeding relationship between the above living things.

Grass à sheep à lion

4        What is the importance of photosynthesis to the environment?

Photosynthesis provide food for all animals either directly or indirectly, and is important in balancing the amounts of carbon dioxide and oxygen in nature.