861: Dehydration in the human body results due to loss of:
(a) Salts
(b) Water
(c) Vitamins
(d) Hormones
862: Consider the following techniques/phenomena:
1. Budding and grafting in fruit plants
2. Cytoplasmic male sterility
3. Gene silencing
Which of the above is/are used to create transgenic crops?
(a) 1 only
(b) 2 and 3
(c) 1 and 3
(d) None
863: A person with AB blood group is sometimes called a universal recipient because of the
(a) lack of antigen in his blood
(b) lack of antibodies in his blood
(c) lack of both antigens and antibodies in his blood
(d) presence of antibodies in his blood
864: The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole?
(a) Increased temperature at polar region due to global warming
(b) Presence of prominent polar front and stratospheric Clouds and inflow of chlorofluorocarbons
(c) Absence of polar front and stratospheric clouds and inflow of methane and chlorofluorocarbons
(d) Presence of prominent tropospheric turbulence and inflow of chlorofluorocarbons
865: In the context of which of the following do some scientists suggest the use of cirrus cloud thinning technique and the injection of sulphate aerosol into stratosphere?
(a) Creating the artificial rains in some regions
(b) Reducing the frequency and intensity of tropical cyclones
(c) Reducing the adverse effects of solar wind on the Earth
(d) Reducing the global warming