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CBSE Class 8 Science: Important Tips and Topics for SA2
Meritnation|Feb 1st, 2016 06:23pm
SA2 or the Summative Assessment II is just around the corner and all Class 8 students must have ideally created a revision timetable and begun their revisions. If you haven’t yet done so, then we recommend you do this now. This is a good approach rather than leaving things to the last days of their preparation.
It is most important to prioritize what topics are important in Class 8 CBSE Science and create your timetable accordingly.
Science is a subject that needs to be studied with a structure because a lot of the concepts are interconnected. To score more and to be prepared to tackle all the tough questions in the subject, pay attention to the list of important chapters below:
Chapter 1 – Crop Production and Management
Important Topics:
1. Rabi and Kharif Crops- Examples
2. Basic Practices of Crop Production
3. Irrigation- Modern methods
Method for Quick Understanding:
1. You must have the basic idea of crop production practices.
| MERITNATION TIPS: a) Questions regarding soil and how it is prepared for cultivation are usually asked. b) You must have the idea about the qualities that should be there in the seed and various techniques to saw seeds. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 9 – Reproduction in Animals
Important Topics:
1. Fertilization and its types
2. Difference between viviparous and oviparous animals with examples
3. Metamorphosis in frogs
4. Modes of asexual reproduction
Method for Quick Understanding:
1. The various modes of reproduction in organisms can be categorised into two types. They either reproduce asexually or sexually. You must know the difference between them and what are the advantages and disadvantages of each type.
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MERITNATION TIPS: a) It is very important for students to know about the reproductive system of human males and females. Frequent questions are asked about the location of gamete formation and functions of various parts in reproductive systems. b) You must know about the place of fertilization and different stages of embryo development. c) Difference between oviparous and viviparous organisms is usually asked and process of metamorphosis is asked generally in the form of definition. |
Chapter 10 – Reaching the Age of Adolescence
Important Topics:
1. Changes in puberty
2. Secondary sexual characteristics
3. Role of hormones
4. Sex determination
Method for Quick Understanding:
1. You must read all the important topics so you don’t miss out important points and understand the chapter well.
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MERITNATION TIPS: a) One of the most asked questions from this chapter is the difference between puberty and adolescence. Secondary sexual characteristics in males and females are important from exam point of view. b) Hormones and their functions are important. c) How is sex determined in case of human beings, is a question that has been asked very frequently. d) Various means to keep oneself healthy during the phase of adolescence is an important topic. e) Learn about AIDS, its causes, symptoms, prevention and cure. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 5 – Coal and Petroleum
Important Topics:
1. Coal
a) Formation
b) Products (coke, coal tar and coal gas) obtained after processing
c) Uses
2. Petroleum
a) Formation
b) Refining
c) Constituent
d) Uses
3. Natural gas
a) Characteristics
b) Uses
c) Advantages of CNG
4. Disadvantages of using fossil fuels
Method for Quick Understanding:
1. Understand the difference between exhaustible and inexhaustible resources.
2. Understand and learn process of carbonisation.
3. Use tabular form to learn different constituent separated from petroleum.
4. Understand the ways from which use of fossil fuels can be decreased as they present in nature in limited quantity.
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MERITNATION TIPS: a) Go through the process of formation of coal and petroleum which is almost same. b) Learn the uses of coke, coal tar and coal and constituent of petroleum and their uses properly as they are important from exam point of view. |
Chapter 6 – Combustion and Flame
Important Topics:
1. Combustion (combustible and non-combustible substances)
2. Essential requirement to produce fire
3. Ignition temperature
4. Inflammable substances
5. Methods to control fire
6. Types of combustion
a) Rapid
b) Spontaneous
c) Explosion
7. Flame
a) Colour
b) Zones
8. Fuel
a) Characteristics of good fuel
b) Calorific value
9. Harmful products and effects of burning fuel
Method for Quick Understanding:
1. Understand the concept of combustion and condition necessary for it.
2. Practise the diagram of flame and label the different zones.
3. Learn the examples of the three types of combustion.
4. Calorific value and its unit is very important topic.
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MERITNATION TIPS: a) Understand the necessary conditions to produce fire. b) Practise the diagram of flame and label it correctly. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 18 – Pollution of Air and Water
Important Topics:
1. Air pollution
a) Air pollutants and their types
b) Smog
c) Role of CFCs in ozone hole formation
d) Acid rain
e) Greenhouse effect
f) Greenhouse gasses
g) Global warming
h) Measures taken to prevent air pollution
2. Water pollution
a) Water pollutants
b) The Ganga case study
c) Potable water
d) Techniques to conserve water
e) 3 R’s i.e Reduce, reuse and recycle
Method for Quick Understanding:
1. Go through the government initiatives like use of CNG in public vehicles, the ‘odd-even rule’ for private transport in Delhi and ‘Green Delhi-Clean Delhi’ to decrease air pollution, melting of icecaps around the world, greenhouse effect, global warming and respiratory diseases.
2. Also, read about campaigns like Ganga Bachao Abhiyan and Yamuna Bachao Abhiyan.
3. Relate all the government initiatives with consequences of air and water pollution to develop a better understanding of both.
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MERITNATION TIPS: a) Do not get confused between greenhouse effect and global warming. b) Read and understand the Ganga action plan and Taj Mahal case study in detail. c) Go through question papers of previous years. |
Chapter 14 – Chemical Effects of Electric Current
Important Topics:
1. Conducting Liquids
2. Chemical Effects of Electric Current
3. Electroplating
Method for Quick Understanding:
1. Like solids, there are certain liquids also which allow current to pass through them. we are asked not to touch an electrical switch or appliance with wet hand for the same reason. The passage of currents through conducting liquids causes certain chemical reactions and these effects are chemical effects of current.
2. The deposition of a desired metal on some other metal using the chemical effect of current is electroplating. This is widely used to polish the utensils, jewellery, etc.
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MERITNATION TIPS: a) This topic does not require much practise but a thorough study of the chapter and learning the definitions is essential. b) Make a circuit tester using LED and check whether certain liquids if they conduct electricity or not. c) Make a list of liquids around you and mark them. d) Chemical effects of electric current and electroplating are important topics. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 15 – Some Natural Phenomena
Important Topics:
1. Electric Charge, Charge Transfer and Electroscope
2. Lightening
3. Earthquake
Method for Quick Understanding:
1. The chapter includes mostly theoretical topics, which are observed by everyone of us. We should be all well aware of their causes and protection. So, the topics should not only be studied but you should also retain them in your mind for future. As they can be helpful anytime.
2. There are two types of electric charges, positive and negative. A body can be charged by rubbing or by simply touching it with a charged object. Electroscope is a device which detects the charge on the object. it is based on the same principle of charging by touching and also on repulsion of similar charges.
3. Lightning is caused by discharge of charges between clouds or clouds and Earth. It is very dangerous. Lightning conductors are used to protect the high raised buildings from the lightning.
4. A sudden shake experienced on Earth’s surface resulting from disturbance in the Earth’s crust is called an earthquake. It is measured on the Richter scale. There are various methods to protect oneself during an earthquake.
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MERITNATION TIPS: a) The working of the Electroscope is an important topic. Make a table of causes and prevention for both earthquakes and lightning. Study seismograph in detail. b) Instead of mugging up the concept, try to relate charge and lightning to understand the topic in a easier manner. |
Chapter 17 – Stars and The Solar System
Important Topics:
1. Phases of Moon
2. Constellations
3. Sun and the Planets
Method for Quick Understanding:
1. This is an interesting chapter and you wouldn’t be bored while reading it. It’s about all the objects we see around us in daytime and nighttime in sky. We know that Sun is at the center and also only light source in our solar system. All other eight planets revolve around the Sun. First four planets are rocky while rest of the planets are gaseous planets.
2. Moon is the only natural satellite to our planet Earth, It is a non-luminous body and reflects the light of the Sun, due to which we see it in phases. You can observe the phases of Moon at night in the sky.
3. We also see innumerable stars at night when the sky is clear. They are all so far from us. Sun is also a star. If you observe the stars throughout the night, you will notice that they also rises from east and set in west, however pole star is always fixed in the sky.
4. These stars when viewed carefully, appear to make patterns in the sky. These patterns are known as constellation.
5. Comets and asteroids are also part of our solar system. Comets come from region beyond the planet Neptune. When they come closer to the Sun, they can be seen in the sky with tails.
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MERITNATION TIPS: a) Make a list of the planets and write at least two important points about each. b) Try to observe the phases of the Moon regularly and make a chart of it. Phases of Moon is an important topic. You can ask your parent or friends to perform an activity using a torch to represent Sun, two balls as Earth and Moon to visualise how these phases are formed. c) Make a list of constellations and try to observe them on clear sky, also sketch them. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
All the best with your SA2 revisions and exams!
Please take a moment to spread these tips with your friends. After all, Knowledge is the only thing that grows when shared! 🙂
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