What role does bile play in digestion?

The walls of auricles are comparatively thicker than ventricles.

$(a)$ Draw the structure of a nephron and label the following on it: Glomerulus,Bowman's capsule,Renal artery,Collecting duct.
$(b)$ What happens to glucose that enters the nephron along with the filtrate?

Explain,giving any three reasons,the significance of transpiration in plants.

In each of the following situations,what happens to the rate of photosynthesis?
$(a)$ Cloudy days
$(b)$ No rainfall in the area
$(c)$ Good manuring in the area
$(d)$ Stomata get blocked due to dust

What prevents backflow of blood inside the heart during contraction?