What are the raw materials used during photosynthesis?

$A$ few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains:

What are the adaptations of leaves for photosynthesis?

What will happen if mucus is not secreted by the gastric glands?

Name the correct substrates for the following enzymes:
$(a)$ Trypsin
$(b)$ Amylase
$(c)$ Pepsin
$(d)$ Lipase

Which enzyme becomes active in the stomach during a low $pH$ value?