Name one animal having single circulation of blood and another having double circulation.

Name the two types of transport systems in the human beings.

Name a waste gas released by the plants (a) only during the day time, and

(b) only during the night time.

State whether the following statements are true or false :

(a) Some organisms store wastes in body parts.

(b) The value of systolic pressure is always lower than that of diastolic pressure.

Name the two parts of a plant through which its gaseous waste products are released into the air.