The source of carbon dioxide for photosynthesis is?

Image by NRCS SD
Raleigh Leesman, Farmer, Hughes County, SD – Raleigh Leesman planted a straight radish cover crop into winter wheat stubble to simulate “natural strip till.” In 2012, he is planting corn in that field. Leesman’s purpose for using the radishes was to increase biological activity specifically in the strip that would enhance residue breakdown to allow the soil to warm-up more quickly in the spring for planting corn. By using the cover crop strip–planting technique, Leesman is using the remaining wheat stubble to protect the soil between the rows of corn. This particular soil type, Promise, is a heavy clay soil. “My plan with this cover crop is to breakdown the residue in the row where the corn will be planted next spring, I am hoping the area will be a dark strip so the soil warms up quickly in these heavy clay soils,“ he said. Leesman is also using this cover crop strip-planting technique on Highmore soils which are more typical in Central South Dakota and east of the river. Leesman is evaluating the use of cover crops for “green” ways to manage his fields. “It looks like the radishes in my field will net the same effect as strip-till only without the machinery,” says Leesman.

Photo by USDA NRCS SD Jason Miller, Pierre.

Question by arriallmax: The source of carbon dioxide for photosynthesis is?
A. chlorophyll. C. sunlight.
B. water. D. air.

In a flower, pollen is produced in the
A. corolla. C. receptacle.
B. ovary. D. stamen.

A stimulant is a drug that
A. causes hallucinations.
B. renders a small area of the body insensitive to pain.
C. has no effect on the body’s nervous system.
D. seems to speed up body functions.

The most important function of the leaf on a plant is
A. storing food that’s not immediately needed.
B. manufacturing food for the plant.
C. protecting the plant.
D. taking in moisture.

Planting rows of corn alternately with rows of clover is an example of
A. strip cropping. C. planting cover crops.
B. terracing. D. planting windbreaks.

Surface water is important because it
A. furnishes plants with water.
B. provides a supply of drinking water.
C. contributes to the water cycle.
D. supplies water to rivers during dry periods.

Feel free to answer in the comment section below