Why do fishes die when taken out of water?

Which of the following statement$(s)$ is (are) true about respiration?
$(i)$ During inhalation,ribs move inward and diaphragm is raised
$(ii)$ In the alveoli,exchange of gases takes place i.e.,oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air
$(iii)$ Haemoglobin has greater affinity for carbon dioxide than oxygen
$(iv)$ Alveoli increase surface area for exchange of gases

The opening and closing of the stomatal pore depends upon:

The inner lining of the stomach is protected from hydrochloric acid by which of the following? Choose the correct one:

$(a)$ Name the protein-digesting enzyme present in pancreatic juice and the hormone secreted by the pancreas.
$(b)$ What is the function of pancreatic juice?

Two green plants are kept separately in oxygen-free containers,one in the dark and the other in continuous light. Which one will live longer? Give reasons.