1. Are the third-order heterotrophs consumed by gungal decomposers?
My guess:Yes?
2. Which of the following fixes atmospheric N2 (nitrogen gas)?
A. photosynthesis
B. symbiotic bacterianon the roots of legumes
C. uv light
D. decay organisms
E. autotrophs
My guess: B?
3. Which ecological pyramid best explains why food chains are typically only three or four links long?
A. Pyramid of biomass
B. Pyramid of energy
C. Pyramid of numbers
D. None of the above
My guess: B? Because only around 10% of the energy will released to the next level?
Thank You! :-]
1. Your guess is incorrect. Third-order heterotrophs are not consumed by fungal decomposers. To find the correct answer, we need to understand the trophic levels and the flow of energy in an ecosystem. Generally, primary producers, such as plants, convert sunlight energy into organic matter through photosynthesis. They are eaten by primary consumers (herbivores), who are in turn eaten by secondary consumers (carnivores). These secondary consumers can be consumed by tertiary consumers, which are the third-order heterotrophs. However, when the organisms die or produce waste, they are decomposed by microbial decomposers like bacteria and fungi, releasing nutrients back into the environment. So, the correct answer is No, third-order heterotrophs are not consumed by fungal decomposers.
2. Your guess is correct. Nitrogen fixation is the process by which atmospheric nitrogen gas (N2) is converted into a usable form by certain organisms. In this case, the symbiotic bacteria on the roots of legumes (a type of plant) are capable of fixing nitrogen gas. These bacteria have a mutualistic relationship with the legumes, providing them with usable nitrogen, while the legumes provide the bacteria with carbohydrates. So, the correct answer is B, symbiotic bacteria on the roots of legumes.
3. Your guess is partially correct. Food chains are typically only three or four links long due to the efficiency of energy transfer from one trophic level to another. In an ecological pyramid of energy, only around 10% of the energy available at one trophic level is transferred to the next level. However, the pyramid of energy alone does not fully explain why food chains are short. The correct answer is actually C, the pyramid of numbers. The pyramid of numbers represents the number of individuals at each trophic level. As energy is transferred from lower to higher trophic levels, the number of individuals decreases. Therefore, the pyramid of numbers helps explain why food chains are typically short as there is not enough available energy to support a large number of trophic levels.