Where does digestion of fat take place in our body?

What will happen if platelets were absent in the blood?

Differentiate between an artery and a vein.

$(a)$ Why does a piece of bread taste sweet when chewed for some time?
$(b)$ Cellulose acts as roughage in humans but serves as a source of nutrients in cows. Justify the statement.

If a plant is releasing carbon dioxide and taking in oxygen during the day,does it mean that there is no photosynthesis occurring? Justify your answer.

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