[Photosynthesis] 2.Do all plants use carbon dioxide to make food ?

According to Dr. Galapagos answer ,not all plants use carbon dioxide to make food.

1)Plants that Use Carbon Dioxide (CO2):

Autotrophic Plants

Green plants are completely autotrophic. Autotrophic plants require only solar energy, carbon dioxide, water, and a few minerals to make all the organic compounds necessary to keep themselves going and growing. So all autotrophic plants use carbon dioxide. Carbon dioxide, water, and minerals are all inorganic compounds. Autotrophic plants, then, can get everything they need from inorganic compounds.

Semiparasitic Plants

Some plants can't quite do it all from just water, CO2, and sunlight (and a few other nutrients like nitrogen). Semiparasitic plants have some green parts and can take carbon dioxide from the air, but they can't quite do it all by themselves, so they have to take some nutrients from an autotrophic host plant. In other words, these types of plants actually connect themselves to another plant and take some of the food they need from the host plant.

Insectivorous Plants

Another type of plant that uses carbon dioxide for photosynthesis, but still needs a little something extra, are the insectivorous plants. Examples of these are the venus fly trap and pitcher plants. They catch and slowly digest insects and other unfortunate little animals that fall into their traps. Insectivorous plants can live without catching animals but they are a lot healthier if they can catch an occasional bug .

2) Plants that don't Use Carbon Dioxide

Holoparasitic Plants

Holoparasitic plants are parasites like the semiparasitic plants which means they have to be directly connected to an autotrophic host plant. But these plants have no green parts and can't do any photosynthesis. They have to get all their nutrients, energy, water, and carbon from the host plant they are attached to. So holoparasitic plants don't use carbon dioxide and don't release oxygen into the air.

The Plants Formerly Known as Saprophytes

The other type of plants that don't use CO2 are the parasitic plants we use to call saprophytes. These plants are now called myco-heterophytes. They have a fascinating connection to the trees that feed them. A fungus, called a mycorrhizal fungus, connects the myco-heterophytes to the tree and transfers the nutrients from the host plant to the parasitic plant. The host plant does all the photosynthesis work to make food, then "shares" some of it, unwillingly no doubt, with the parasitic plant. The fungus feeds the parasite. I assume the fungus feeds itself also.

Now , i know that not all plants make food using carbon dioxide