BIOLOGY

Biology by Campbell and Reece



Biology by Campbell and Reece

Question 1

Stomatal pores are microscopic structures on the epidermis of leaves formed by 2 focused guard units that command the exchange of water vapor and CO2 between plants and the atmosphere. Stomatal size (S) and density (D) work out greatest leaf diffusive (stomatal) conductance of CO2 (gcmax) to sites of assimilation. Although large variations in D discerned in the fossil record have been correlated with atmospheric CO2, the crucial significance of likewise large variations in S has been overlooked. Here, we use personal diffusion theory to explain why large alterations in ...