1 What would have happened if the seeds had been placed in a

1. What would have happened if the seeds had been placed in a wet/light, oxygen-free, pure CO2 environment (does the biomass of the plant increase/decrease, why)? Explain in two sentences.

2. What would have happened if the seeds had been placed in a wet/light, CO2 -free, pure oxygen environment (does the biomass of the plant increase/decrease)? Explain in two sentences.

Solution

1. What would have happened if the seeds had been placed in a wet/light, oxygen-free, pure CO2 environment (does the biomass of the plant increase/decrease, why)? Explain in two sentences.

There would be a decrease in the biomass. when there is no oxygen, the metabolic process becomes slow. Incomplete oxidation of food occurs by anaerobic respiration and seeds may not germinate.

2. What would have happened if the seeds had been placed in a wet/light, CO2 -free, pure oxygen environment (does the biomass of the plant increase/decrease)? Explain in two sentences.

There will be an increase in the biomass as seeds germinate. they get the required energy by aerobic respiration. As oxygen is present, seeds utilise the oxygen for their activation of metabolic processes by converting stored nutrients into energy. They require a large amount of oxygen which is generally obtained from soil or water.