1) All the following are excretory substances except ..... a) Co2 b) Nitrogen c) Water d) Urea 2) Which of the following plants has leaves that droop and fold up upon touch? a) Gazania b) Sun flower c) mimosa d) Rose plant 3) Which of the following living organism doesn't have a specialised respiratory system? a) Frog b) Amoeba c) Fish d) Elephant  4) Insects obtain oxygen from the atmospheric air through ..... a) Lungs b) Gills c) Stomata d) Tracheal tubes 5) Which of the following is required for occurrence of artificial photosynthesis a) Hydrogen only b) Co2 only c) Nitrogen d) Hydrogen and co2 6) all of the following are inorganic substances used by plant in photosynthesis except a) Water b) mineral salts c) co2 d) glucose 7) which of the following represents the main pump of blood in circulation in human a) the heart b) arteries c) veins d) blood capillaries

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