Q. Which among the following is a character of chloroplast which makes them qualified self replication?
1) Presence of DNA only
2) Absence of RNA
3) Presence of both DNA and RNA
4) None of the above
Q. The water reaches great heights in trees because of suction pull caused by -
1) absorption
2) transpiration
3) evaporation
4) None of the above
Q. Chlorophyll absorbs ___________ wavelengths of the sunlight.
1) green and blue
2) green and red
3) red and blue
4) None of the above
Q. The stomata open or close due to changes in the -
1) protein composition of cells
2) amount of water in cells
3) position of the nucleus in cells
4) None of the above
Q. Which of the following statements about diamond and graphite is true?
1) They have the same crystal structure
2) They have the same degree of hardness
3) They have the same electrical conductivity
4) None of the above
Q. Detect the odd one -
1) Setting of cement
2) Burning of coal
3) Ripening of fruit
4) None of the above
Q. Why does dry HCl gas not change the color of dry litmus paper?
1) Blue litmus becomes dry in the presence of dry HCl gas
2) No H3O+ ions are present. Litmus changes colour only in the presence of H3O+ ions
3) HCI gas acts as a dehydrating agent
4) None of the above
Q. The odour of acetic acid resembles that of -
1) tomato
2) kerosene
3) vinegar
4) None of the above
Q. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. Which of them will turn red litmus to blue?
1) Acid
2) Base
3) Distilled water
4) None of the above
Q. Which acid is described as HOOC COOH?
1) Oxalic acid
2) Acetic acid
3) Carbonic acid
4) None of the above
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