Concept explainers
Feeding relationships can be defined as a set of associations of feeding habits. Different organisms in a community practice different feeding habits, and the relation between all of them vary accordingly. All the organisms in a community are divided into types, namely producers and consumers. The producers make their own food, while the consumers rely on the producers for the food and energy.

Answer to Problem 1TQ
Food chain is a sequence in which one organism is the prey for other organisms. Therefore, option (d) is correct.
Explanation of Solution
Justify reasons for the correct statement:
The food chain is defined as the representation of the direction, in which energy is transferred from a producer to a consumer. It is unidirectional, and consists of a single sequence. The food chain is a linear network. The link in a food chain starts from producers and end at predator species.
Option (d) is given as “Food chain”.
Hence, option (d) is correct.
Justify reasons for the incorrect statements:
Option (a) is given as “life history”.
A life history of a community encompasses a record of all the species, which are present, and their succeeding and preceding generations. Hence, it is a wrong answer.
Option (b) is given as “keystone relationship”.
A keystone species is the species that has a large and overall effect on its community. It is the presence or absence affects other species of the community. The keystone species are related to all the other organisms of the community, in terms of food. Hence, it is a wrong answer.
Option (c) is given as “food web”.
A food web is defined as a mixture of all the food chains present in a community connected to each other at same organism. It shows how different food chains interact, and are followed for life sustenance. Hence, it is a wrong answer.
Hence, options (a), (b), and (c) are incorrect.
The food chain is the interaction between different organisms in terms of their prey and predator relationship.
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