Q12 of 42 Page 1

Our farmers still use DDT. How is this affecting the local bird population ?

Dichlorodiphenyltrichloroethane or DDT is an insecticide whichwas banned due to its various harmful impacts on the environment.High concentrations of DDT disturb calcium metabolism in birds, which causes thinning of eggshell and their premature breaking, eventually causing decline in bird populations.


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The above diagram shows human male reproductive system (one side only).


(a) Identify ‘X’ and write its location in the body.


(b) Name the accessory gland ‘Y’ and its secretion.


(c) Name and state the function of ‘Z’.