CLASS XII (BIOLOGY)

MENDELIAN DISORDER NOTES DOWNLOAD

 

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PETROLEUM REFINERIES IN INDIA

 COAL IN INDIA

PETROLEUM IN INDIA

COAL AND PETROLEUM SCIENCE VIII

CLASS VIII SCIENCE

COAL AND PETROLEUM

Question: 1. What are the advantages of using CNG and LPG as fuels?

Answer: Following are the advantages of using CNG and LPG as fuels:

(a) They are more efficient

(b) They can be easily transported; either in cylinders or through pipelines

(c) They are less polluting than other fossil fuels

Question: 2. Name the petroleum product used for surfacing of roads.

Answer: Bitumen

3. Describe how coal is formed from dead vegetation. What is this process called?

Answer: - Dead remains of plants are buried under the earth millions of years ago. Due to intense heat and pressure inside the earth they are converted into coal. The process of conversion of dead remains of plants into coal is called carbonization.

Question: 4. Fill in the blanks :

(a) Fossil fuels are …………, ………… and ……………..

Answer: - Coal, Petroleum and Natural gas

(b) Process of separation of different constituents from petroleum is called ……………..

Answer: Refining

(c) Least polluting fuel for vehicle is ………………

Answer: CNG

Question: 5. Tick True/False against the following statements :

(a) Fossil fuels can be made in the laboratory. (F)

(b) CNG is more polluting fuel than petrol. (F)

(c) Coke is almost pure form of carbon. (T)

(d) Coal tar is a mixture of various substances. (T)

(e) Kerosene is not a fossil fuel. (F)

Question: 6. Explain why fossil fuels are exhaustible natural resources.

Answer: It takes millions of years for the formation of fossil fuels and they are in limited quantity. Due to this, fossil fuels are exhaustible in nature.

Question: 7. Describe characteristics and uses of coke.

Answer: Coke is a type of coal. It is a tough, porous and black substance. It is almost pure form of carbon. Coke burns much cleaner than coal and provides more energy for comparable mass. It is used in manufacture of steel and in extraction of many minerals.

Question: 8. Explain the process of formation of petroleum.

Answer: The organisms which lived in the sea got buried at the bottom of oceans. Over a period of time, their dead bodies were covered with sediments. Intense pressure and heat under the earth’s layers transformed these organisms into petroleum.

Question: 9. The following Table shows the total power shortage in India from 1991– 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis. 

 Answer:

 

POLLINATORS OF WATER LILY

CHAPTER TEST

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Test Paper:2 Chapter-2

Time 40 min               Max Marks: 20  

 

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Value Points / Marking Scheme: 2

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IMPORTANT DOWNLOADS FOR CLASS XII

IMPORTANT DOWNLOADS FOR CLASS XII

REPRODUCTION AND DEVELOPMENT IN ANIMALS

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REPRODUCTION, GROWTH AND DEVELOPMENT

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 NOTES ON CHAPTER REPRODUCTIVE HEALTH

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CLASS IX HOLIDAY HOME WORK

CLASS IX HOLIODAY HOME WORK 2017-18

1. Carry out the following osmosis experiment:https://www.youtube.com/watch?v=8e-xNbk2bxw
Take four peeled potato halves and scoos each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.
Now,
(a) Keep cup A empty
(b) Put one teaspoon sugar in cup B
(c) Put one teaspoon salt in cup C
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following:
(i) Explain why water gathers in the hollowed portion of B and C.
(ii) Why is potato A necessary for this experiment?
(iii) Explain why water does not gather in the hollowed out portions of A and D.
2. Collect your vaccination card. Photocopy it and learn about vaccines and immune system.
3. Collect different types of (5 each)
(a) pulses (1-10) (b) Cereals (11-20) (c) Oil seeds(21-30) (d) Medicinal Leaves(31-40)
4. Collect pictures of Different plant and animal species (20 pictures)
(a) Wild Animals (1-10) (b) Domestic Animals (11-20) (c) Flowering Plants (21-30 ) (d) Non flowering plants (31-40)
5. Draw colored and well labelled diagram of
(a) Plant cell (b) Animal Cell (c) a bacterial Cell

NOTES: CHAPTER-3 HUMAN REPRODUCTION

CLASS 12TH CHAPTER -3 HUMAN REPRODUCTION

IMPORTANT EVENTS :-

1. GAMETOGENESIS.
2. INSEMINATION.
3. FERTILISATION.
4. BLASTOCYST DEVELOPMENT.
5. IMPLANTATION.
6. GESTATION.
7. PARTURITION ( CHILD BIRTH ).

NOTES DOWNLOAD