Which one of the following was probably absent in the atmosphere at the time of origin of life?
Ammonia
Oxygen
Hydrogen
Carbon
Correct Answer :
B. Oxygen
Related Questions
Haemophllia is a genetic disorder which leads to
decrease in haemoglobin level
rheumatic heart disease
increase in haemoglobin level
non-clothing of blood
The golden age of Dinosaurs was
Palaezoic
Cenozoic
Mesozoic
Proterozoic
Evergreen forests are confined to
Equatorial region
Temperate region
Alpine region
Arctic region
When one gene controls two or more different characters simultaneously, the phenomenon is called
Apomixis
Pleiotropy
Polyploidy
Polyteny
Coagulation of blood in vessels is prevented during normal circulation by
heparin
prothrombin
plasmogen
thromboplastin
The aphotic zone means that light is
always present
present during day
always absent
present during night
Lizards, snakes, crocodiles and turtles belong to the class
Aves
Reptilia
Mammalia
Amphibia
Which one of the following is caused by the expression of a recessive gene present on sex chromosome?
Rheumatism
Nervous shock
Muscular dystrophy
Cerebral haemorrhage
Genes are made of
Carbohydrates
Proteins
Fats
Nucleotides
In case of a heart attack a hormone is injected as an emergency measure. Which one is it?
Thyroxine
Adrenaline
Heparin
Insulin
Late Blight' is a disease that affects the _______ crop.
coconut
cashew
potato
pepper
Hydrotropism means the growth of roots
away from water
towards water
into water
out of water
Edward Jenner to find out the efficacy of vaccination used
his own body
his friend's body
a corpse
a laboratory animal
Which one of the endocrine glands disappears after puberty?
Thyroid
Thymus
Adrenals
Pituitary
Jaundice is caused by a/an
virus
bacteria
fungus
animal
Memory is the responsibility of
cerebrum
cerebellum
medulla oblongata
spinal cord
Egg laying animals are referred to as
viviparous
oviparous
ovoviviparous
vegetative
Necrosis is a symptom which is recognised by
pattern colouration on leaves
little leaves
out growth
death of tissues
Dialysis is used when there is a failure of
heart
lungs
liver
kidneys
Tetrodotoxin is a potent poison that
erodes blood vessels
blocks conduction of nerve impulses causing respiratory paralysis
produces damage to the kidneys
produces intestinal bleeding
Cancer is induced by certain viruses called
poxviruses
adenoviruses
oncogenic viruses
herpesviruses
HIV causes
cancer
hepatitis
AIDS
Herpes
The scientist who discovered the blood groups is
Landsteiner
TH Morgan
William Harvey
Darwin
Two tall plants, each being a hybrid and carrying a recessive factor for dwarfness are crossed. What proportion of their offspring will be dwarf?
0.5
0.25
0.75
1
Which one is called anti-haemorrhagic vitamin?
A
C
E
K
The wall of the heart is made of programmed cell death is known as
voluntary muscles
involuntary muscles
cardiac muscles
skeletal muscles
A biopsy is performed on a patient generally to detect which one of the following?
Cancer
Tuberculosis
Appendicitis
Renal failure
Which of the following contains the highest protein content per gram?
Groundnut
Soyabean
Apple
Wheat
Which of the following crops helps in nitrogen fixation?
Rice
Wheat
Maize
Beans
The science of improving the hereditary qualities of future generations of mankind is referred to as
genetics
eugenics
epigenesist
epistasis