Question

1. Which of the following biomes is likely to have the longest food chains?

		Tundra
		Boreal forest/Taiga
		Temperate deciduous forest
		Open ocean
		Desert

2. A key difference between the carbon, nitrogen, and phosphorus cycles is

		carbon dioxide dissolves more readily in oceans than nitrogen
		phosphorus enters the biosphere primarily through soil rather than air and is less renewable than carbon dioxide or nitrogen
		most nitrogen in the atmosphere is in a readily usable form whereas carbon in the air is hard to use
		carbon is more abundant in the air than nitrogen and phosphorus combined
		the carbon cycle is strongly affected by human activity while the nitrogen and phosphorus cycles are unaltered

3.

For which of the following organisms is the carrying capacity of the environment likely to be greatest

		primary producer
		primary consumer
		secondary consumer
		tertiary consumer
		secondary detritivores

4.

The biome contributing most to earth's total net primary productivity is

		tropical rainforest
		boreal forest
		temperate deciduous forest
		algal bed and reef
		open ocean photic zone

Answer 1

1 . tundra

Biome: A large geographical region whose climate produces a characteristic climax association of plants and animals. The term biome usually refers to terrestrial habitats (on land). In North America there are about six major biomes. Aquatic ecosystems, such as the ocean, are often subdivided into different zones, such as the intertidal, pelagic, benthic, photic and aphotic zones.

The food chain of Tundra Biome:

Resident animals have to change what they are hunting and eating as the seasons change. The food chain in the Arctic Tundra consists of predators such as owls, foxes, wolves, and polar bears at the top of the chain. Predators hunt herbivores, plant eating animals, such as caribou, lemmings, and hares.  

2 . phosphorus enters the biosphere primarily through soil rather than air and is less renewable than carbon dioxide or nitrogen

Animals get most of their nitrogen from the water they drink whereas they get their phosphorus from the food they eat. Nitrogen occurs primarily in deep sediments whereas phosphorus occurs primarily in the atmosphere.The phosphorus cycle differs from the nitrogen cycle and the carbon cycle because phosphorus doesn't have a gas phase as a part of the cycle. ... Both nitrogen and carbon are found in gas phase within the atmosphere, and move from the atmosphere into living things or into the soil.

3 . primary producers

Carrying capacity is the number of organisms that an ecosystem can sustainably support. An ecosystem’s carrying capacity for a particular species may be influenced by many factors, such as the ability to regenerate the food, water, atmosphere, or other necessities that populations need to survive.Carrying capacity depends on the amount of resources available, the size of the population and the amount of resources each individual is consuming.

4 . Tropical rain forest

The world's ecosystems vary tremendously in productivity.Net primary productivity varies among ecosystems and depends on many factors. These include solar energy input, temperature and moisture levels, carbon dioxide levels, nutrient availability, and community interactions (e.g., grazing by herbivores)