Question

Communities

Question 1

0 / 1 point

the trophic level that obtains its energy directly from the producers of an ecosystem

Question options:

	primary producer
	tertiary consumer
	primary consumer
	secondary consumer Question 7 0 / 1 point the position of a species or group of species in a food chain or a food web that reflects the distance to the primary energy source of the food chain or web. Question options: producer trophic cascade secondary consumer trophic level Question 8 0 / 1 point a species which often forms the major structural portion of the habitat Question options: resilient species keystone species foundation species apex predator Question 11 0 / 1 point a species whose presence has inordinate influence, greater than it's own abundance, in maintaining the prevalence of various species in an ecosystem. Question options: foundation species photoautotroph regulatory species keystone species

Answer 1

Question 1: The correct answer is, primary consumer.

Explanation: A trophic level is the position of an organism in the food chain. It simply represents a feeding level. Primary producers comprise the first trophic level, followed by primary consumers (second trophic level), then secondary consumers (third trophic level) and so on.

Therefore, primary consumers (second trophic level) obtain their energy directly from the producers of an ecosystem.

Question 7: The correct answer is, trophic level.

Explanation: A food chain shows the movement of energy through a system by indicating the path of food from a producer to a final consumer. A trophic level is the position of an organism in the food chain. It simply represents a feeding level in a food chain. Therefore, the trophic level reflects the distance to the primary energy source of the food chain or web.

Question 8: The correct answer is, foundation species.

Explanation: Foundation species are known as the base of a habitat and these species have a great influence on the major structural portion of the habitat. They are often primary producers and also an abundant organism. For example, the foundation species of coral reef ecosystems is coral.

Question 11: The correct answer is, keystone species.

Explanation: When the activity of a species has a great influence on the community structure in spite of their low abundance, that species is called keystone species. This species plays an important role in controlling the relative abundance of other species in the community.