851. Who first discovered how blood circulates in the human body?
A. Edward Jenner
B. Joseph Lister
C. William Harvey
D. Gregor Mendel

852. Through which organ does a fish respire?
A. Nose
B. Lungs
C. Gills
D. Fins

853. Which lenses are used by people having short-sightedness?
A. Convex
B. Concave
C. Concavo-convex
D. Plain

854. Which of the following animals does not have nervous system?
A. Bat
B. Squirrel
C. Sponges
D. Lizard

855. Which of the following is caused by a deficiency of iron in the diet?
A. Giotre
B. Scurvy
C. Anaemia
D. Rickets

856. A group of elephants is called___________?
B. Herd

857. Which liquid is used in an aneroid barometer?
A. Mercury
B. Alcohol
C. Water
D. None

858. Clotting of blood vessels is called?
A. Thrombosis
B. Fibrosis
C. Agglutination
D. None of these

859. Oil of vitriol is_________?
A. Nitric acid
B. Hydrochloric acid
C. Phosphoric acid
D. Sulfuric acid

860. The term PVC used in the plastic industry stands for______________?
A. Phosphavinyl chloride
B. Phosphor vanadiu chloride
C. Polyvinyl chloride
D. Polyvinyl carbobate