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Fill in the following blanks with suitab...

Fill in the following blanks with suitable words :
(a) Ultraviolet rays can cause skin ………..
(b) Pesticides enter the food chain at the ………. Level
(c) Grass `to` …….. `to` Human
(d) Lettuce `to` ……… `to` Fox
(e) Plants `to` Antelope `to` .............

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The correct Answer is:
(a) cancer (b) producer (c) Goat (d) Rabbit (e) Lion
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Fill in the following blanks with suitable words : The food synthesised by plants is stored as …………….

Fill in the following blank with suitable words: Untreated human excreta may cause …………pollution and …….pollution.

fill in the following blanks with suitable words : (A) An element is made up only one kind of …………. (b) Brine is a ………. Whereas alcohol is a ……………. . ( c) Brass is an alloy which is considered a ………….. (d) the three important metalloids are ................ , .............. and ..................... (e) the elements which are sonorous are called ..............

Fill in the following blanks with suitable words: a) Parallel rays of light are refracted by a convex lens to a point called the…………… b) The image in a convex lens depends uponthe distance of the ……………. From the lens.

Fill in the following blanks with suitable words. (a) Parallele rays of light are reflected by a concave mirror to a point called the…………… (b) The focal length of a concave mirror is the distance from the …………to the mirror. ( c) A concave mirror................rays of light wheres a convex mirror..............rays of light. (d) For a convex mirror, parallel rays of light appear to diverge from a point called the ...........................

Fil in the following blanks with suitable words: (a) The next higher homologue of ethanol is…………… (b) The next homologue of ethanol is……………. (c ) The next higher homologue of ethane is…………… (d) The functional group present in ehanol is............... (e) Organic compoiunds having -overset(O)overset(||)C-OH functional group are known as...............

Fill in the following blanks with suitable words: (a) The addition of oxygen to a substance is called ………. Whereas removal of oxygen is called ………. (b) The addition of hydrogen to a substance is called ………. Whereas removal of hydrogen is called......... (c ) Anti-oxidants are often added to fat containing foods to prevent......... due to oxidation.

Fill in the following blanks with suitable words : (a) Most of the refraction of light rays entering the eye occurs at the outer surface of the…………….. (b) The part of eye sensitive to light is…………… (c) The part of eye which alters the size of the pupil is................ (d) When light is dim, the pupil becomes..................... (e) The iris controls the amount of................entering the eye. (f) The ciliary muscles control the shape of the................................ (g) To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made............. (h) To bring light from a near object to a focus on the retina of the eye, the convex eye-lens needs to be made............

Fill in the following blanks with suitable words : (a) Genes always work in ................ . (b) In pea plants, the gene for dwarfness is ............... Whereas that for tallness is .............. . (c) Most people have ............ earlobes but some have ............... earlobes . (d) A human gamete contains ........... chromosomes whereas a normal body cell has ............... chromosomes in it. (d) All races of man have ........... blood groups . (f) The .............. chromosomes for a ............. are XX whereas that for a ............. are XY .

LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. Why are there rarely more than five links (or five organisms) in a foo...

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  2. Name two predators of snakes in a food web operating in a forest ecosy...

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  3. Fill in the following blanks with suitable words : (a) Ultraviolet r...

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  4. TEN PER CENT LAW

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  5. Write the full form of CFC. Give its one harmful effect.

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  6. Explain how, harmful ultraviolet radiations of sunlight are prevented ...

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  7. What are the causes of depletion of ozone layer ? Which diseases are l...

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  8. Explain how harmful chemicals enter our bodies.

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  9. If we excessively use pesticides to protect the crops from diseases, t...

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  10. What is meant by biological magnification ? With the help of a food ch...

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  11. What is meant by bioconcentration of pesticides ? Which common pestici...

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  12. What is garbage? What does garbage consist of ?

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  13. MODES OF WASTE DISPOSAL

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  14. How can the wastes such as paper, plastic and metal objects be dispose...

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  15. Give a method for the disposal of household wastes such as left-over f...

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  16. What is meant by incineration? For what purpose is it used ?

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  17. How are most of the solid wastes in urban areas disposed of?

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  18. State two advantages of using disposable paper cups over disposable pl...

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  19. What is sewage ? How is sewage disposed of ?

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  20. EFFECTS OF OZONE DEPLETION

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