AP BIOLOGY

Detailed explanation-1: -Majority of the plant species on earth (85%) use C3 photosynthesis in which the initial product of carbon dioxide assimilation is 3-phosphogylycerate, an organic compound containing 3 carbon atoms. C3 plants are those that use the C3 carbon fixation pathway as the sole mechanism for photosynthesis.

Detailed explanation-2: -C3 Plants. The C3 pathway gets its name from the first molecule produced in the cycle (a 3-carbon molecule) called 3-phosphoglyceric acid. About 85% of the plants on Earth use the C3 pathway to fix carbon via the Calvin Cycle.

Detailed explanation-3: -About 85% of plant species are C3 plants. They include the cereal grains: wheat, rice, barley, oats. Peanuts, cotton, sugar beets, tobacco, spinach, soybeans, and most trees are C3 plants.

Detailed explanation-4: -C3 plants include some of the most important sources of calories all over the world: cowpea, cassava, soybean, and rice. The regions where these crops are grown in are often hot and dry, meaning they could benefit from the energy-saving mechanisms of C4 photosynthesis.

Detailed explanation-5: -Of about 300000 plants known on earth, ∼90% are C3 plants, while the CAM and C4-species constitute about 10% and 1%, respectively.