Question

In the grassland ecosystem, the number of primary producers is about 6 million. The number of top carnivores supported by it would be ______.

• A. 60 million
• B. 30 million
• C. 6 million
• D. 3 million

Answer 1

Answer: (D)

3 million

• In a grassland ecosystem, a grazing food chain is commonly seen. For instance, grass (primary producer) $\to$ grasshopper (primary consumer) $\to$ frog (secondary consumer) $\to$ snake (tertiary consumer).
• The number of primary producers is large and top consumers are few as compared to the producers. If the number of primary producers is about 6 million, then the number of top carnivores is lesser than 6 million, which is 3 million from the given options.

Hence, the correct answer is option D, i.e., 3 million.