Classwork – 15 – 10 – 2012, Monday

15 Oct

Science :

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Page 40 :

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a.  Give three ways energy is lost in food chains.

A.  

  • Lost as heat
  • Lost through respiration
  • Lost in performing activities

b.  Why do food chains usually contain a maximum of five different organisms ?

A.  Because there is not enough energy to sustain the sixth level.

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Page 41 :

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c.  How did DDT get into this food chain ?

A.  Through tiny plants.

d.  What happens to the concentration of DDT as it passes up the food chain ?

A.  It increases due to bi accumulation.

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Summary Questions :

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 2.  Draw the flowchart or diagram as you wish and the answer :

A.  The increase in the concentration of DDT in  the body of grebes caused it to get poisoned.

3.  The answer is the first food chain.

A. Because less amount of energy is lost in the first food chain.

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Objective :

  • To learn how predators are adapted to catch prey.
  • How prey animals are adapted to avoid being eaten.

Outcome :

  • Able to understand how the population of predators and prey affect each other.

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Mathematics :

Objective :  Equations and solutions of equations.

Outcome :  Able to achieve the Objective.

4x + 6 = 9 :-

A.  4x = 9 – 6

= 3

= 4x = 3

x = ¾

                                                 Exercise 2d

6.  3y + 2 = 7 – 2y  :-

A.  3y + 2y = 7 – 2 = 5y = 5

= y = 5/5 = 1

10.  3p – 2 = 4 – 3(p + 2)  :-

A.  3p – 2 = 4 – 3p – 6

= 3p = 4 – 6 + 2

= 6p = 6 – 6 = 6p = 0

p = 0/0 = 0

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