In: Biology
10. Salivary amylase digests - D. Starches
Explanation : Amylase is a digestive enzyme that acts
upon the starch in food, breaking it down into smaller carbohydrate
molecules. Salivary glands in our mouth produces salivary amylase,
which begins the digestive process by breaking down starch when we
chew our food, converting it into maltose, a smaller
carbohydrate.
11. Countercurrent exchange in legs of geese - C. Reduces heat lost
to water
Explanation : Many birds like geese possess a mechanism for
countercurrent heat exchange, which is a
circulatory adaptations that allow heat to be transferred from
blood vessels containing warmer blood to those containing cooler
blood.
In case of geese, the artery that runs down the leg carries warm
blood from the body. The artery is positioned right alongside a
vein that carries cold blood up from the foot. The descending, warm
blood passes much of its heat to the ascending, cold blood by
conduction. This means that less heat will be lost in the foot due
to the reduced temperature difference between the cooled blood and
the surroundings.