When air is blown from the mouth into a test tube containing lime water,the lime water turns milky due to the presence of:

During respiration,the exchange of gases takes place in:

During respiration,exchange of gases takes place in:

State in brief the function of:
$(a)$ Renal artery
$(b)$ Kidney
$(c)$ Ureter
$(d)$ Urinary bladder

What is the functional difference between the four chambers of the heart?

Name the following:
$(a)$ The process in plants that links light energy with chemical energy
$(b)$ Organisms that can prepare their own food
$(c)$ The cell organelle where photosynthesis occurs
$(d)$ Cells that surround a stomatal pore
$(e)$ Organisms that cannot prepare their own food
$(f)$ An enzyme secreted from gastric glands in the stomach that acts on proteins