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CBSE Class 7 Science: Important Tips and Topics for SA2
Meritnation|Feb 1st, 2016 12:04pm
SA2 or the Summative Assessment II is just around the corner and all Class 7 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 7 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 10 – Respiration in Organisms
Important Topics:
1. Mechanism of breathing
2. Breathing rate
3. Human respiratory system-Diagram
Method for Quick Understanding:
1. The definition and types of respiration on the basis of presence of oxygen is important.
2. We know that our breathing rate is not constant during various activities throughout the day. What factors affect the rate of breathing is important.
3. Mechanism of breathing and route of inhaled air is important to learn.
| MERITNATION TIPS: a) Different organisms respire through different modes be it plants or animals. b) You must know about all these modes and you must also know why certain type of mechanism is beneficial for few species. c) The process of respiration in plants and the organs that are involved in this process are important. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 11 – Transportation in Animals and Plants
Important Topics:
1. Diagram of Heart and functioning
2. Human excretory system- Diagram and Functioning
3. Types of blood vessels
4. Xylem, Phloem
Method for Quick Understanding:
1. Study all the diagrams properly for a better understanding of the topics.
2. Practise the diagrams and label them neatly.
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MERITNATION TIPS: a) Blood and lymph are important. You must know their definition, properties, composition and functions. b) Blood vessels such as arteries, veins and capillaries are important to learn. You must know their structure functions as well as how they supply blood to heart and various other parts of body. c) Structure of heart is importance. You must know about auricles and ventricles as they are frequently asked topics. d) You must know about the various excretory products that are released in different organisms and how do they get rid of them. e) You must also know about structure of human excretory system and composition of urine. f) Plants also have excretory system for elimination of wastes. You must remember about xylem and phloem and how they distribute the water and food in plant. g) Definition of transpiration is usually asked with its uses. |
Chapter 12 – Reproduction in Plants
Important Topics:
1. Modes of Asexual Reproduction
2. Pollination
3. Fertilization
4. Seed Dispersal
Method for Quick Understanding:
1. Asexual reproduction of organisms with its various modes and advantages and disadvantages of asexual reproduction is very much asked in exams.
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MERITNATION TIPS: a) Flower is the reproductive part of a plant but it itself has various components that play important roles in sexual reproduction. b) You must know the structure of flower and function of its various parts. c) The whole process of pollination and how fruit gets formed and seeds are dispersed is important topic for exams. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 17 – Forests: Our Lifeline
Important Topics:
1. Decomposers with examples
2. Role of forests
Method for Quick Understanding:
1. Observe what happens when a plant is uprooted.
2. Understand the importance of trees and forests in our daily lives.
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MERITNATION TIPS: a) Advantages of forestation and disadvantages of afforestation are important topics and one must prepare them for the exam. |
Chapter 9 – Soil
Important Topics:
1. Soil Profile
2. Types of soil and their characteristics
a) Sandy soil
b) Clayey soil
c) Loamy soil
3. Properties of soil
a) Percolation rate of water
b) Moisture in soil
c) Absorption of water by soil
4. Soil and crop relationship
Method for Quick Understanding:
1. Learn characteristics of different horizons of soil
a) A-Horizon: Top soil (Soft, porous and retain more water)
b) B-Horizon: Middle layer (Harder and more compact)
c) C-Horizon: Third layer (Small lumps of rock)
d) Bedrock: Hard and difficult to dig
2. Learn and practise formula used to calculate percolation rate of water and absorption of water by soil.
3. Understand and learn experiment to observe moisture in soil and definition of shimmering.
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MERITNATION TIPS: a) Learn about soil profile by practising its diagram. b) You must learn all the formulae in the chapter and practise questions associated to them to get a good score. c) Learn the characteristics of the three types of soil. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 16 – Water: A Precious Resource
Important Topics:
1. Distribution of water on the Earth
2. Forms of water
3. Water cycle
4. Ground water
5. Water table
6. Infiltration
7. Aquifer
8. Factors responsible for depletion of water table
a) Increasing industries
b) Agricultural activities
c) Increasing population
9. Water management (water harvesting)
10. Water saving habits
Method for Quick Understanding:
1. Understand and learn about different sources of freshwater.
2. Understand how water on the earth is managed by various processes that result in the water cycle.
3. Understand and learn the concept of groundwater and the various terms related to it.
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MERITNATION TIPS: a) From exam point of view, the concept of groundwater is an important aspect. b) Also understand and learn terms related to groundwater like water table, infiltration, aquifer. c) Prepare short note on the topics like depletion of water table and water management. |
Chapter 18 – Wastewater Story
Important Topics:
1. Wastewater
2. Contaminants
3. Components of sewage
4. Wastewater treatment plant (WTP)
5. Measures to reduce waste generation
6. Sanitation
Method for Quick Understanding:
1. Understand what is sewage, how it is produced and what happens when sewage remains untreated.
2. Learn about the various techniques that can be applied in daily life to reduce wastewater.
3. Understand the sewage treatment process in detail.
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MERITNATION TIPS: a) Focus on learning components of sewage, methods to reduce wastewater in daily lives, importance of sanitation and diseases caused by improper sanitation. b) WTP can be remembered by:
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RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 14 – Electric Current and its Effects
Important Topics:
1. Electronic Components & Circuit
2. Electric cell & Battery
3. Heating Effect of Current
4. Magnetic Effect of Current
5. Electric Fuse & MCB
6. Electromagnet & Electric Bell
Method for Quick Understanding:
1. We see so many electronic devices around us like bulb, fan, remote, iron heater etc. Few of them run on cell while others on direct current supply or batteries. Make circuits with their circuit diagrams.
2. Take a television remote and see how you arrange the cells and form a battery. Check how negative terminal is connected to positive and so on.
3. When electric current flows through a wire, the wire gets heated up. This heating effect of current is used in devices like bulb, room heater and electric iron.
4. Electric fuse used in our household is based on the same concept and is used to prevent the electric fires. Similarly, a current carrying wire acts as a temporary magnet. This magnetic effect of current is used to make strong electromagnets like in electric bell and transistors etc.
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MERITNATION TIPS: a) Practise the circuit diagrams of electric bell and other electric circuits. b) Heating effect of current and magnetic effect of current are very important topics. c) You must learn the working of fuse and MCB. |
Chapter 15 – Light
Important Topics:
1. Properties of Light and Reflection
2. Image Formed by Plane Mirror
3. Image Formed by Spherical Mirror
4. Image Formed by Spherical Lenses
5. White Light and Seven colors
Method for Quick Understanding:
1. Light travels in a straight line and is composed of seven colors. Rainbows is a natural phenomenon which supports this. Light also reflects back when is incident on a smooth surface. Mirrors are based on the same concept. Image is formed in the plane mirror due to reflection of light. The image formed is virtual, erect and laterally inverted.
2. You see so many other types of optical objects also around you, like spoon, rear view mirrors in vehicle, magnifying glasses, mirrors at blind turns, shaving mirrors etc.
3. Some of them form real image and some also forms virtual images.
4. The mirror which is bulged out is convex mirror. It forms erect, virtual image which is smaller in size. It is also used as magnifying glass.
5. The mirror which is bulged in is concave mirror. It can form both real and virtual image.
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MERITNATION TIPS: a)Compare virtual and real image. b) Make a chart for image formation by concave and convex mirror. Do same for concave and convex lens. c) Differentiate between concave and convex lenses and mirror. |
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! 🙂
Add Comment 1 Comment
1. anushka | March 6th, 2016 at 2:17 pm
really useful!!!
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