Answer: Heterotrophic
Explanation: Phytoplanktons can be defined as the microscopic organisms found on the top of the water bodies that has the ability to trap solar energy and make food.
This ability of the organism to make its own food can be defined as photosynthesis which is an autotrophic mode of nutrition.
Here, the whale differs from the phytoplankton in terms of mode of nutrition. Whale has heterotrophic mode of nutrition as it depends on other organism for its food. It basically feeds on the smaller fishes for its survival.
