611: Blood grouping was discovered by:
(a) Landsteiner
(b) Robert Koch
(c) William Harvey
(d) Louis Pasteur
612: Rickets is caused due to:
(a) Deficiency of Vitamin A
(b) Deficiency of Vitamin D
(c) Deficiency of Vitamin C
(d) Low intake of proteins
613: Foot-and-Mouth disease in animals, a current epidemic in some parts of the world, is caused by
(a) Bacterium
(b) Fungus
(c) Protozoan
(d) Virus
Explanation:
Foot and Mouth disease is caused by a 'Virus' in cattle, buffaloes, swine, sheep and goats. Running sores in the mouth and between the toes. Reduced milk flow and loss of body weight are the main symptoms.
614: Main constituents of Biogas are:
(a) Methane and Carbon dioxide
(b) Ethylene and Carbon dioxide
(c) Butane and Carbon monoxide
(d) Methane and Carbon monoxide
615: Identical twins are born when:
(a) Two sperms fertilise one ovum
(b) Two sperms fertilise two ovums simultaneously
(c) One sperm fertilises the ovum and zygote divides into two separate cells developing independently
(d) One sperm fertilises two ovums