If salivary amylase is lacking in the saliva,which of the following events in the mouth cavity will be affected?

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

“All plants give out oxygen during day and carbon dioxide during night”. Do you agree with this statement? Give reason.

What is $translocation$? Why is it essential for plants? Where in plants are the following synthesized:
$(i)$ Sugars
$(ii)$ Hormones

$(a)$ Draw a diagram of the human alimentary canal and label the following: Oesophagus,Gall bladder,Liver,and Pancreas.
$(b)$ Explain the statement: 'Bile does not contain any enzyme but it is essential for digestion.'

Why is blood circulation in the human heart called double circulation?