Question

1. produce a food chain using 4 organisms of your choice: grass, rabbit, fox, hawk. 32. determine which organisms in your food - chain are the following: producer, primary consumer, secondary consumer, etc. write this terms under each organism above. 33. assign each organism in your food chain above to each of the trophic levels below: first trophic level, second trophic level, third trophic level, fourth trophic level. 34. describe the 10% law. 35. in the energy pyramid at right, write the name of the organisms from your food chain in each trophic level as well as the number of calories available. 36. in order to make your food chain a food web, what would you need to add to it? 10,000 kcal

Explanation:

1. A food - chain shows the linear feeding relationship among organisms. For the given organisms (grass - rabbit - fox - hawk), grass is the producer, rabbit is the primary consumer, fox is the secondary consumer, and hawk is the tertiary consumer.
2. Grass is the producer as it makes its own food through photosynthesis. Rabbit is the primary consumer as it eats the producer (grass). Fox is the secondary consumer as it eats the primary consumer (rabbit). Hawk is the tertiary consumer as it eats the secondary consumer (fox).
3. Grass is at the first trophic level (producer level). Rabbit is at the second trophic level (primary consumer level). Fox is at the third trophic level (secondary consumer level). Hawk is at the fourth trophic level (tertiary consumer level).
4. The 10% law states that only about 10% of the energy available at one trophic level is transferred to the next trophic level. For example, if the producer (grass) has 10,000 kcal of energy, the primary consumer (rabbit) will get about 10% of that, which is 1000 kcal.
5. At the first trophic level (grass), energy = 10,000 kcal. At the second trophic level (rabbit), energy = 1000 kcal (10% of 10,000 kcal). At the third trophic level (fox), energy = 100 kcal (10% of 1000 kcal). At the fourth trophic level (hawk), energy = 10 kcal (10% of 100 kcal).
6. To make a food - web, you would need to add other organisms that interact with the ones in the given food - chain. For example, you could add insects that also eat grass, or snakes that might eat rabbits and be eaten by hawks.

Answer:

1. Grass (producer), Rabbit (primary consumer), Fox (secondary consumer), Hawk (tertiary consumer)
2. Grass - producer; Rabbit - primary consumer; Fox - secondary consumer; Hawk - tertiary consumer
3. Grass - first trophic level; Rabbit - second trophic level; Fox - third trophic level; Hawk - fourth trophic level
4. The 10% law states that only about 10% of the energy available at one trophic level is transferred to the next trophic level.
5. First trophic level (grass): 10,000 kcal; Second trophic level (rabbit): 1000 kcal; Third trophic level (fox): 100 kcal; Fourth trophic level (hawk): 10 kcal
6. Other organisms that interact with the existing ones in the food - chain, such as insects that eat grass or snakes that eat rabbits.