Describe the ‘Green House Effect’ in your own words.
Green house effect is caused by green house gases. When the average temperature of the earth increases due to the increment in the level of the carbon dioxide in the atmosphere. When solar radiations reaches the earth, some of these radiations are absorbed by Earth and released back into the atmosphere. But the green house gases trap the solar radiation and do not allow the heat to leave. The excessive increase in the temperature of Earth leads to global warming.
Popular Questions of Class 8 Science
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Describe with the help of a diagram an instrument which can be used to detect a charged body.
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Sketch larynx and explain its function in your own words.
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Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
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Make a labelled diagram of a candle flame.
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What is metamorphosis? Give examples.
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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.
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Make sketches of animal and plant cells. State three differences between them.
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What is a constellation? Name any two constellations.
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Describe the construction of a kaleidoscope.
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Complete the crossword with the help of clues given below:
Across
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.Down
1. Green plastids.
2. Formed by collection of tissues.
4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.
Recently Viewed Questions of Class 8 Science
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Match items in column A with one or more items in column B:
A B
(i) Inner planets (a) Saturn
(ii) Outer planets (b) Pole Star
(iii) Constellation (c) Great Bear
(iv) Satellite of the Earth (d) Moon
(e) Earth
(f) Orion
(g) Mars - Q:-
Fill in the blanks with suitable words.
(a) Time taken by an object to complete one oscillation is called ................... .
(b) Loudness is determined by the .........................of vibration.
(c) The unit of frequency is..........................
(d) Unwanted sound is called ......................... .
(e) Shrillness of a sound is determined by the ................. of vibration. - Q:-
Write short notes on the following:
(a) Cytoplasm
(b) Nucleus of a cell - Q:-
Write a paragraph in your own words on each of the following.
(a) Preparation of soil (b) Sowing
(c) Weeding (d) Threshing - Q:-
Draw sketches to show the relative positions of prominent stars in
(a) Ursa Major and (b) Orion - Q:-
Can you store lemon pickle in an aluminium utensil? Explain.
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How are test tube babies born?
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How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?
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Explain how soil gets affected by the continuous plantation of crops in a field.
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Compare LPG and wood as fuels.
- NCERT Chapter