Dark reaction happens in the photosynthetic process of plants or autotrophs. (a) A giant redwood tree = Autotroph (b) A spider = Heterotroph (c) A rose bush = Autotroph (d) A mushroom = Heterotroph (e) A blue whale = Heterotroph <span>Autrophs are the organisms that have the capacity to form their own food from inorganic substances like the carbon dioxide. </span> <span>Heterotrophs are the organisms that cannot produce their own food but depends on other animals or plants for their nutritional needs.</span>
