California 6th grade content standards

Take your kids outside and watch your sunflower. Ask them to draw a food web that includes your sunflower, it's pollinators and it's predators (birds and insects that eat it). You can talk about how the plant converts sunlight into seeds that are usable by birds. You can look at the different bees around the world (some of the tropical ones are beautiful). You can compare the plants pollinated by birds, bats, bees, flies, mammals, etc...

Ecology (Life Sciences) standard
Organisms in ecosystems exchange energy and nutrients among themselves and with the environment. As a basis for understanding this concept:
Students know energy entering ecosystems as sunlight is transferred by producers into chemical energy through photosynthesis and then from organism to organism through food webs.
Students know matter is transferred over time from one organism to others in the food web and between organisms and the physical environment.
Students know populations of organisms can be categorized by the functions they serve in an ecosystem.
Students know different kinds of organisms may play similar ecological roles in similar biomes.

Students know the number and types of organisms an ecosystem can support depends on the resources available and on abiotic factors, such as quantities of light and water, a range of temperatures, and soil composition.