How does the transportation of water occur at night in the absence of transpiration?

Oxygen liberated during photosynthesis comes from

$(a)$ What is the nature of food coming from the stomach?
$(b)$ Mention any two structural modifications in the small intestine which help in the absorption of food.

Where do the following processes take place?
$(i)$ Filtration of blood
$(ii)$ Reabsorption of glucose and water
$(iii)$ Secretion of salts to make final filtrate
$(iv)$ Collection of the final filtrate

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

Which of the following statements is (are) true about the heart?