The loss of water vapour in transpiration, exchange of carbon-dioxide to oxygen in the leaf occurs through pores called stomata. Normally stomata are open in the day time and close during the night. The immediate cause of opening and closing of the stomata is a change in the turgidity of the guard cells. The inner wall of each guard cell towards the pore or stomatal aperture is thick and elastic. When turgidity increases within the two guard cells flanking each stomatal aperture or pore, the thin outer walls bulge out and force the inner walls into a crescent shape.

Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 8 - Transport in Plants>Questions

Mary Jones and Geoff Jones Solutions for Chapter: Transport in Plants, Exercise 2: Questions

Author:Mary Jones & Geoff Jones

Mary Jones Biology Solutions for Exercise - Mary Jones and Geoff Jones Solutions for Chapter: Transport in Plants, Exercise 2: Questions

Attempt the practice questions on Chapter 8: Transport in Plants, Exercise 2: Questions with hints and solutions to strengthen your understanding. Cambridge IGCSE® Biology Coursebook Third Edition solutions are prepared by Experienced Embibe Experts.