Question

18. Salivary amylase digests

A. monosaccharides

B. glucose

C. protein

D. starches

E. maltose

11. Countercurrent exchange in the legs of geese

A. facilitates circulation

B. reduces the SMR

C. reduces heat lost to the water

D. increases the energy spent on thermoregulation

Answer 1

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.