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Ans : (3) Dumb-bell shaped
Grass being a monocot, has Dumb-bell shaped stomata in their leaves
Winged pollen grains are present in : (1) Mango (2) Cycas (3) Mustard (4) Pinus
Stomatal movement is not affected by : (1) O2 concentration (2) Light (3) Temperature (4) CO2 concentration