Eco System

The correct answer is option (A): Only primary consumer
Tropic levels are the position of animals in a food chain or food web. There are mainly four tropic levels that are as follows: 1st tropic level: Producers, are the organism that produces their own food with the help of sunlight and resources. 2nd tropic level: Primary consumers, are the organism that feeds on the producers. Example: Mice 3rd tropic level; Secondary consumers, the organism that feeds on the primary consumers are placed in this tropic level. Example: snake. 4th tropic level: Tertiary consumers, are the ones who feed on the secondary consumers. Example: Hawk. Sparrow is a primary consumer as they feed on seeds, which is a primary product.

The correct answer is option (B): ligin and chitin
The breakdown of the organic matter into simpler inorganic matter is called a decomposition. The rate of decomposition depends on temperature, water, oxygen availability, and composition. For the detritus with high lignin and chitin content, the decomposition rate will be slower. On the other hand, the detritus with high nitrogen content will have comparatively faster decomposition. Lignin and chitin, reduce the surface area available for the enzymatic penetration for the decomposition. Thus, the answer is lignin and chitin