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(a)  Christina  wants  to  increase  the  number  of  eggs  per  year  by  using
                         selective breeding. Which two chickens should she breed together and
                         why?
                         (b) Write one example of each poultry breeds.
                         (i) Indigenous breed
                         (ii) Exotic breed
                         (c) State any two ways to control the loss of poultry during outbreak of a
                         disease.
                         (d) Mention any two desirable characters to be taken into consideration
                         for cross breeding.
                 Q19.    (a) What are the major group of activities involved for improving of crop    5
                             yields?
                         (b) What are the factors on which crop variety improvement depend on?
                         (c)  Name the nutrients and their sources required by the plants.
                 Q20.    Many fish stocks have declined.                                              5
                         Marine ecologists considered the three topics shown in figure given below
                         when they discussed the decline of fish stocks.















                         Describe the key points for each of the three topics shown in above figure.
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