Question: 2.67 Understand the origin of CO2 and O2 as waste products of metabolism and their loss from the stomata of a leaf.

Plants need to excrete excess carbon dioxide and oxygen. Carbon dioxide is a waste product of aerobic respiration in plant cells. oxygen is a waste product of photosynthesis.

Unlike animals, plants do not have special excretory organs. Excess carbon dioxide and oxygen are excreted from the plant through the stomata in the leaves.

AEROBIC RESPIRATION: The Breakdown of Glucose to release Energy in Cells in the Presence of Oxygen to Produce Carbon Dioxide and Water (and Energy)

EQUATION:

Glucose       +       Oxygen       →       Carbon dioxide       +       Water

C₆H₁₂O₆                      6O₂                               6CO₂                          H₂O

*As a Waste Product, Plants will Produce Carbon Dioxide and Oxygen which will be removed through the Stomata (When it is Open) by Diffusion*

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