The Great Sunflower Project

Grow more than one sunflower and measure differences in height, number of flowers, number of leaves.
Grow some sunflowers in very sunny spots and some in shady spots to compare the effects of light. Grow some in soil with fertilizer and some without to look at environmental stress.
Watch flowers turn into seeds and then collect the seeds and grow them up for the next year.

Life Sciences standard

Plants and animals have predictable life cycles. As a basis for understanding this concept:
Students know that organisms reproduce offspring of their own kind and that the offspring resemble their parents and one another.
Students know the sequential stages of life cycles are different for different animals, such as butterflies, frogs, and mice.
Students know many characteristics of an organism are inherited from the parents. Some characteristics are caused or influenced by the environment.
Students know there is variation among individuals of one kind within a population.
Students know light, gravity, touch, or environmental stress can affect the germination, growth, and development of plants.
Students know flowers and fruits are associated with reproduction in plants.