Correct Answer: Stomatal pores open

Solution : The correct option is to Stomatal pores open.

When water enters a plant's guard cells, they become turgid, meaning they fill with water and swell. The guard cells alter form as their turgidity increases. Guard cells have a bean-shaped structure that permits them to open and close the stomatal pores. This stomatal pore opening provides gas exchange between the plant and its surroundings. It specifically enhances the absorption of CO₂ for photosynthesis as well as the release of oxygen (O₂) and water vapour.