(1) Ethylene is a plant hormone. Plant hormones are trace organic substances produced in a certain part of plants and then transported to the affected part, which play a significant role in regulating growth and development. Ethylene mainly plays a role in promoting fruit ripening and organ shedding such as old leaves. Abscisic acid is a plant growth inhibitor, which can inhibit cell division and seed germination, promote senescence and abscission of leaves and fruits, promote dormancy and improve stress resistance, so it can be used as a plant growth inhibitor.

(2) The respiration rate of cells can be measured by measuring the consumption of O2 per unit time or the production of CO2 per unit time. The chemical reaction formula of oxygen directly participating in fruit cells is O2+[H]H2O+ energy.

(3) From Figure A and Figure B, it can be inferred that persimmon treated with 1-MCP ripens later, because persimmon treated with 1-MCP releases less ethylene and ripens slowly, so persimmon treated with 1-MCP ripens later.

So the answer is:

(1) adjustment? Abscisic acid?

(2)O2 consumption (write O2 only? Do not give points)

O2+[H]H2O+ energy

(3) Persimmons treated with 1-MCP at night released less ethylene and matured slowly.