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Which one of the following was probably absent in the atmosphere at the time of origin of life?
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The layer of stagnant water in which light penetrates is called
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When a movement of a plant organ is stimulated by contact with an object, it is termed
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Which among the following vitamins is considered to be a harmone?
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The deficiency of Vitamin A which leads to poor vision during night is termed
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Under the immunisation programme's Govt. of India is providing vaccination to prevent some vaccine-preventable diseases. Which of the following is NOT one of them?
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Animals that feed only on dead flesh are
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When the earth was formed it had an atmosphere with
A. Hydrogen, Oxygen and Nitrogen
B. Water Vapour, Hydrogen and Oxygen
C. Oxygen, Carbondioxide and Nitrogen
D. Water Vapour, Ammonia and Methane
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The hormones are carried to target organs through the
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Tse-Tse fly is the vector for
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The heart of the human embryo starts beating in the _____ week of its development.
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Riboflavin is otherwise known as
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Scurvy is a disease caused by the deficiency of vitamin.
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Biologists have so far known, found and identified a large number of species in the plant and animal kingdom. In terms of numbers, the largest found and identified so far is from among the
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Necrosis is a symptom which is recognised by
A. pattern colouration on leaves
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Whale reproduces by
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The diseases that are caused by lack of vitamins are called
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Timberline shows
B. the limit of the forest
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Eosinophil™s are stained by
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The insects do not have blood pigments because
B. blood does not have a respiratory function
D. pigments are elsewhere
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The smallest size of a cell which can be seen directly by the eye is
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Biocatalysts are
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Valves are present inside
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The theory of use and disuse was used to explain evolution by
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Blood clotting requires vitamin
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In case of a heart attack a hormone is injected as an emergency measure. Which one is it?
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The suggestion that the chromosomes are the carriers of hereditary material was first made by
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The blood pressure is controlled by the hormone
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Plants growing in sunlight are called
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Fledgling is a term often used to denote the young one of a