Educational worksheet on food webs and food chains, including diagrams and questions for learning about ecosystem relationships.

Here are the answers to the questions on your worksheet.

Part 1: Food Web

Q1. What is a food web?
A food web is a diagram that shows how different plants and animals in an ecosystem are connected by what they eat. It is made up of many overlapping food chains, showing that most animals have more than one source of food.

Q2. What would happen if the snake population decreases?
If the snake population decreases, the animals that snakes eat (like frogs, birds, and mice) will likely increase in number because fewer of them are being eaten. At the same time, the animals that eat snakes (like hawks) might decrease in number or have to eat other prey (like rabbits or foxes) to survive.

Q3. When do we consider the ecosystem to be in equilibrium?
An ecosystem is in equilibrium when the populations of all living things stay relatively stable over time. This happens when there is enough food and resources for everyone, so no single group grows too large or dies out completely.

Q4. What happens to energy as we move up from one step to another in a chain or web?
As energy moves up the food chain (from plants to herbivores to carnivores), some of it is lost at each step. Animals use most of the energy they get from food for moving, breathing, and keeping warm. Only a small amount of energy is stored in their bodies to be passed on to the animal that eats them.

***

Part 2: Food Chain

Q1. What is a food chain?
A food chain is a simple line that shows the flow of energy from one organism to another. It starts with a producer (usually a plant) and follows the path of who eats whom, ending with a top predator.

Q2. Name the producer in the food chain.
The producer in this food chain is the Grass. (Producers are plants that make their own food using sunlight).

──────────────────────────────────────

Final Answer:
Food Web Section:
Q1: A food web is a network of interconnected food chains showing feeding relationships in an ecosystem.
Q2: The prey populations (frogs, birds, mice) would increase, and predator populations (hawks) might decrease or switch food sources.
Q3: When population sizes remain stable because birth rates equal death rates and resources are balanced.
Q4: Energy decreases; roughly 90% is used for life processes or lost as heat, and only about 10% is passed to the next level.

Food Chain Section:
Q1: A linear sequence showing how energy and nutrients move from one organism to another through eating.
Q2: Grass