ecological pyramids

ecological pyramids are drawn as ___________ with ______________.

what are trophic levels?

• the position of an organism in a food chain or food pyramid

• a term used in relation to the average weather in an area.

• the energy levels in an ecosystem

• a diagram showing the number of organisms present in each level of food chain.

what forms the first trophic level in an ecosystem?

• primary consumers

• tertiary consumers

• producers

what do food chains and webs show?

• the flow of materials and energy in a habitat.

• the number of organisms living in a habitat.

• what every organism consumes in a habitat.

• the relationship between organisms in an ecosystem

what can't be shown from food chains and/or food webs?

• what eats what in an ecosystem.

• the number of organisms living in a habitat.

• bar charts with bars stacked up on top of each other.

what is a pyramid of numbers?

in which case would a pyramid of numbers be inverted?

• when there is a single large producer.

• they are always drawn inverted.

• when there are a large number of parasites feeding on relatively larger animals.

• there is no particular reason.

an example of a case when a pyramid of numbers would invert would be:

• a large bird eating a caterpillar.

• a small snake eating a mouse.

• a large mouse eating cheese.

• a group of caterpillars feeding in one big tree.

a pyramid of numbers has a definite shape and cannot vary.

• true

• false

what is biomass?