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Guard cells help in
A
Fighting against infection
B
Protection against grazing
C
Transpiration
D
Guttation
Detailed Solution
Each stoma is bounded by two guard cells; the stomata are the main sites of transpiration and of gaseous exchange.
When the guard cells become turgid, their thin outer walls bulge out and pull the thick inner walls into a crescent shape, so the stomatal pore opens; when they lose turgor, the pore closes.
By opening and closing the stomata, the guard cells regulate the loss of water vapour, i.e., transpiration.
Guttation occurs through hydathodes, which are permanently open pores without regulating guard cells.
Hence guard cells help in transpiration.
When the guard cells become turgid, their thin outer walls bulge out and pull the thick inner walls into a crescent shape, so the stomatal pore opens; when they lose turgor, the pore closes.
By opening and closing the stomata, the guard cells regulate the loss of water vapour, i.e., transpiration.
Guttation occurs through hydathodes, which are permanently open pores without regulating guard cells.
Hence guard cells help in transpiration.