Guard cells help in:

Options

(a) transpiration
(b) guttation
(c) fighting against infection
(d) protection against grazing

Correct Answer:

transpiration

Explanation:

Guard cells help in transpiration. Transpiration is the evaporation of water from the aerial parts of plants, especially leaves but also stems, flowers and roots. Stomatal opening allowing the diffusion of carbon dioxide and oxygen during photosynthesis.