Answer :
When the CO₂ levels are higher on mars then the biomass of the plant will be increased and the nutritional value will be decreased.
Biomass is defined as the total quantity of any substance per unit area or volume. The biomass is made up of carbon element, hence more the carbon in any substance more is its biomass. Since the CO₂ are high in martian soil, this depicts high biomass of potatoes there.
Nutritional value is defined as the balanced proportion of all the components like carbohydrate, proteins, fats, etc. Since the CO₂ content is high it will lead to more amounts of carbohydrates then the proteins and other components.
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