IGCSE Biology Paper-5: Specimen Questions with Answers 5 - 6 of 62

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Question 5

Describe in Detail Essay▾

Here you give an example of animal. How its teeth are, differ from human teeth.

Figure Shows the Teeth of Dog
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Explanation

The given picture is related to dog

  • Humans have 32 teeth and doge have 42
  • Humans have (top and bottom) 8 incisors, 4 canines, 8 premolars, and 12 molars. Dogs have (top and bottom) 12 incisors, 4 canines, 16 premolars, and 10 molars
  • Dogs also have Carnassial teeth. The human molars and pre-molars are generally flat, creating the surface area for grinding.

Question 6

Describe in Detail Essay▾

There are some natural and manmade fibers are given below. How will you differentiate them?

Image Shows Different Kind of Fibers
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Explanation

Take one by one thread and hold it with forceps. Then burn it in the flame on a heating device . By doing this we observed Natural fibers (cotton, wool) burn without melting while man-made fibers (polyester, nylon) , first become soft and then melt to form a lump before burning. The fibers, which are change into ash on burning, are natural fibers and those, which melt and form a bead before burning are manufactured (synthetic) fibers.

Image Shows Holding and Burning of Woolen Thread

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