It is d) to continue the species!!
hope this helps :)
Answer:
The differential equations and the boundary conditions(initial and final)are shown in the attachment
state the uses of excretory products in plants
Carbon dioxide, excess water produced during respiration and nitrogenous compounds produced during protein metabolism are the major excretory products in plants. Plants produce two gaseous waste products i.e. oxygen during photosynthesis and carbon dioxide during respiration.
Hope this helps :)