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REPRODUCTION IN ANIMALS CHAPTER 9 CLASS 8TH
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Tuesday, March 18, 2014
Friday, March 14, 2014
Chapter 12 Reproduction in plants
- Prevent overcrowding
- Avoid completion for sunlight,water and minerals
- Invade new habitats
- A spore producing plant
- Bread mould
Chapter no- 14 Electric Current and its Effects
- Magnets are used in toys.
- Doctor to take out small particles of magnetic metal like iron, nickel etc, which may have fallen in eye, uses electromagnets.
- Electromagnets are used in electric fans, electric trains, electric motors etc.
- Electromagnets are used in radio, TVs, mobile etc.
- It is used in electric bell.
- Never touch a light bulb with bare hands.
- Do not touch appliances when its ON it may cause fire.
Sunday, March 2, 2014
CHAPTER 15 LIGHT
Q-Name the mirror which has bulged in the center and is narrow at the ends?
A- Convex mirror
A- Lens
A- Mirror
A- When the light hits a place shiny surface like a mirror and it bounces off the surface is called the reflection of light.
A- Dispersion of light
A- The rainbow is not formed in noon because in the noon earth is in the direction opposite to sun, hence the rainbow on earth is not seen.
A- Violet, indigo, blue, green, yellow, orange and red.
A- Convex lens for reading purpose.
A- Yes we can. We can change the path of light by reflecting it from a shiny and polished Surface.
Q- Explain the nature of image made in a plane mirror?
A- Erect
Q-Why concave mirror called a converging mirror?
Q- Mention the uses of concave mirror?
A- 1) concave mirrors are used by eye Specialists and dentists.
4) It is used in car headlights and torches.
A- 1) Convex mirror is used as a rear view mirror in vehicles.
Q- Mention the uses of Plane Mirror?
A- It is used for optical testing
Q- Mention the uses of lenses?
A- Convex lens are used as Magnifying glass
Convex lens are used by People having weak eyesight.
A- After rainfall when sun rays passes through suspended raindrops it splits into 7colours and a rainbow is formed.
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IMPORTANT KEYWORDS Reproduction- It is the one of the important life process, which ensures the continuation of similar kinds of individu...
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पर्यावरण आज एक चर्चित और महत्वपूर्ण विषय है जिस पर पिछले दो-तीन दशकों से काफी बातें हो रहीं हैं और काफी चिंता भी काफी व्यक्त की जा रही है...
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IMPORTANT KEYWORDS Reproduction- It is the one of the important life process, which ensures the continuation of similar kinds of individu...
-
Q- Explain the importance of reproduction in organisms? Ans- Reproduction is very important for the organisms because it ensures the cont...
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पर्यावरण आज एक चर्चित और महत्वपूर्ण विषय है जिस पर पिछले दो-तीन दशकों से काफी बातें हो रहीं हैं और काफी चिंता भी काफी व्यक्त की जा रही है...
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Define terms- Life expectancy- Number of people expected to live the time he or she is born. Dependency ratio - This is the ...
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ONE WORD OR SENTENCE Ques - In which year the environment ( protection act) act was passed? Ans- 1986 Ques -What does Article ...
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Q-What did the author find in a junk shop? Answer - The author found a very old 19th century roll-top desk in a junk shop. It was ...
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Define terms- History Infanticide - The crime of killing a baby. Rampant - Something bad spreading in such a way which is ...
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Q- Name the types of historical monuments? Religious and secular Q list the secular monuments? Towers, havelis, palaces, forts...
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Define terms- civics Offence - An act of breaking the law. Cognizable offence- A serious offence for which one can be trie...