By which cell the process of opening and closing of stomata is controlled?

(1)  Epidermal Cell
(2)  Guard Cell
(3)  Accessory Cell
(4)  Leaf Cell

Energy flow in an Ecosystem is-
(1) Unidirectional (2) Bidirectional (3) Bark (4) Roots

Some organs of man have their own specific functions but carry out excretion as a secondary function. Identify them.
(1) Lungs, Kidney, Nephron (2) Liver, Skin, Lungs
(3) Skin, Kidney, Intestine    (4) Intestine, Liver, Kidney

The instrument for measuring blood pressure is called
(1) Manometer (2) Sphygmomanometer (3) Barometer (4) Potentiometer

What is the weight of the brain of an adult human?

(1)  1350gm
(2)  1.350gm
(3)  1530gm
(4)  3150gm