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Select the secondary consumer.
a. A fish that feeds on algae.
b. A hawk that feeds on a mouse that feeds on an insect.
c. A plant that is parasitic to another plant.
d. A lion that eats a gazelle that feeds on grass.
e. A beetle that feeds on nectar.

Answer
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Hint: Secondary consumers are the carnivores that depend upon the herbivores for their nutrition. In the trophic level, decomposers and detritivores are placed along the side of the pyramids because they are responsible for the breakdown of dead organisms at all trophic levels.

Complete answer:
The food chain is a sequential arrangement of organisms of the ecosystem in such a way that food and its contained energy passes from one trophic level to the other.

Trophic level can be defined as any food level of an ecosystem or a food chain.
There are mainly four trophic levels in a food chain which are as follows-
- Producers (T1): It includes the green plants which produce their own food through the process of photosynthesis.
- Primary consumers (T2): These are the herbivores which depend directly upon the green plants or producers. For example- mouse, rabbit, cow, etc.
- Secondary consumers (T3): These are the carnivores which depend upon the herbivores. For example- snake, fox, etc.
- Tertiary consumers (T4): It includes the organisms which depend upon the carnivores for their food. For example- tigers, lions, etc.



According to the question:
- A fish that feeds on algae (producer) is a primary consumer.
- A hawk that feeds on a mouse (secondary consumer, as it feeds on an insect) is a tertiary consumer.
- A plant that is parasitic to another plant (producer) is a primary consumer.
- A lion that eats a gazelle (primary consumer, as it feeds on grass) is a secondary consumer.
- A beetle that feeds on nectar (producer) is a primary consumer.

Hence, The correct answer is option (D).

Note: Nectar is a sugar rich secretion of the plants, which attracts the birds or insects for the purpose of pollination.
All the green plants are considered as the producers as they are autotrophic in nature.
During the transfer of food from one trophic level to the next, only 10% energy is stored in the flesh, remaining energy is lost during metabolic processes.