If Atmospheric CO₂ Concentrations Increase Twofold or More, How Will

question 30

Multiple Choice

If atmospheric CO₂ concentrations increase twofold or more, how will plants be affected, disregarding any changes in climate?

• A) All plants will experience increased rates of photosynthesis.
• B) C₃ plants will have faster growth; C₄ plants will be minimally affected.
• C) C₄ plants will have faster growth; C₃ plants will be minimally affected.
• D) C₃ plants will have faster growth; C₄ plants will have slower growth.
• E) Plant growth will not be affected because atmospheric CO₂ concentrations are never limiting for plant growth.

---

Definitions:

Ephedrine

A medication and stimulant used to prevent low blood pressure during spinal anesthesia and treat narcolepsy, obesity, and asthma.

Marijuana

A psychoactive drug derived from the Cannabis plant, used for medical or recreational purposes, known to affect mood, perception, and cognition.

Glaucoma

A group of eye conditions that can cause damage to the optic nerve, often due to high eye pressure, and can lead to vision loss if not treated.

Chemotherapy

A type of cancer treatment using one or more anti-cancer drugs as part of a standardized regimen to kill or slow the growth of cancer cells.