What is sunflowers protective structures?

Farmers who practice specialized farming? How much Dawn dish soap and water should be used to effectively kill ants? How many acres in .02 hectares? Which was the earliest plantation crop introduced in India? Are sow bugs harmful to plants? What is the Independent variable on music making a plant grow better? An Oak Tree by Michael Craig Martin? Why do you think a Venus flytrap hair needs to be touched more than once when its raining? How can I effectively grow vegetables in shade? What does neem tree look like? Why no flowers on a laburnum tree? What is mouldboard plow? Can aluminum cans change from biomass to compost? When a one of the zebra family is hurt what did other family do? How long does squash take to grow from seed to harvest? What are household gardens? How do you say Maple tree in Portuguese? What is nanotechnology in plants? What is the curled up frond a fern called? How tall does Pearl barley grow?