Question

In a grazing food chain
A. Primary consumers eat detritus
B. Primary consumers eat photosynthetic organisms
C. Secondary consumers eat detritus
D. Secondary consumers eat photosynthetic organisms

Answer 1

Grazing is defined as the process of eating plant material by herbivores. This type of food chain is directly dependent on the sunlight for photosynthesis and it always adds energy to the ecosystem.

Complete answer:
GRAZING FOOD CHAIN
In a grazing food chain energy in the lowest trophic level is derived from photosynthesis.
The grazing food chain starts with producers like green plants and later move from herbivores to carnivores.
This type of food chain is directly dependent on the sunlight for photosynthesis.
The grazing food chain always adds energy to the ecosystem.
This food chain helps in fixation of inorganic nutrients.

So, the correct answer is (B) Primary consumers eat photosynthetic organisms.

Additional information:
Food chain, in ecology is the linear sequence of transfers of matter and energy from organism to organism in the form of food.
In a food chain, each organism occupies a different trophic level, starting from the bottom—the producers—and moving upward.
The primary producers occupy the base of the food chain. The primary producers are photosynthetic organisms, also called autotrophs. E.g., plants, algae, or cyanobacteria.
The organisms that feed upon the primary producers are known as primary consumers. Primary consumers are plant-eaters also called herbivores. E.g., Goat, deer.
The organisms that feed upon primary consumers are known as secondary consumers. Secondary consumers are usually meat-eaters also called carnivores. E.g., Fox.
The organisms that feed upon secondary consumers are called tertiary consumers. E.g., Lion

Note: The number of trophic levels in a grazing food chain must always be more than two levels. It always adds energy to the ecosystem.