Question

1. which of the following would be the best energy source for developing countries because it is cheap and easy to obtain?

a. coal
b. biomass
c. geothermal
d. nuclear

1. about ____ % energy of one trophic level is transferred to the next level in food chains/webs.

a. 90
b. 80
c. 10
d. 20

1. which of the following lists shows the levels of ecological organization from largest to smallest?

a. biome, biosphere, ecosystem, population, community, organism
b. biosphere, biome, ecosystem, community, population, organism
c. organism, population, community, ecosystem, biosphere, biome
d. population, community, organism, ecosystem, biosphere, biome

1. which of the following is true about genetic engineering of food crops?

a. genetic engineering is accepted as the best and safest agricultural method worldwide.
b. genetic engineering modifies genetic material to attempt to create better crops.
c. genetic engineering is one of the leading causes of malnutrition.
d. genetic engineering makes crops require more water and pesticides.

1. what might the continued burning of fossil fuels do for future generations?

a. increase atmospheric oxygen available to organisms
b. increase the amount of fixed nitrogen available for plants
c. decrease the necessity of plants performing photosynthesis
d. contribute to the rising temperature of the planet

Explanation:

Question 8

Developing countries need cheap and easy - to - obtain energy sources. Biomass (like agricultural waste, wood, etc.) is relatively easy to access and inexpensive to use in many developing regions. Coal mining can be costly and has environmental issues, geothermal requires specific geological conditions, and nuclear energy is expensive to set up. So biomass is the best choice here.

In food chains/webs, the energy transfer between trophic levels is typically about 10%. This is due to the fact that organisms use a large portion of the energy they consume for their own metabolic processes (like respiration, growth, etc.), and only a small fraction (around 10%) is passed on to the next trophic level.

The levels of ecological organization from largest to smallest are: biosphere (the entire zone of life on Earth), biome (a large - scale ecological community with similar climate and organisms), ecosystem (a community of organisms and their non - living environment), community (all the different populations in an area), population (a group of the same species), organism (an individual living thing). So the correct order is biosphere, biome, ecosystem, community, population, organism.

Answer:

b. Biomass

Question 9