The opening and closing of the stomatal pore primarily depend upon:OxygenTemperatureWater in the guard cellsConcentration of CO2       Which organisms primarily use photosynthesis to fulfil their carbon and energy requirements?HeterotrophsDecomposersAutotrophsOmnivores       Statement 1: Carbon dioxide and water are taken in by autotrophic organisms for the process of photosynthesis.Statement 2: These substances are converted into carbohydrates in the presence of sunlight and chlorophyll.Both Statement 1 and Statement 2 are true.Statement 1 is true, and Statement 2 is false.Statement 1 is false, and Statement 2 is true.Both Statement 1 and Statement 2 are false.       What is the process called when organisms acquire oxygen from outside the body and use it to break down food sources for cellular needs?DigestionPhotosynthesisFermentationCellular respiration       The small pores present on leaf’s surface are calledStomataChlorophyllGuard cellsNone of these       _______ is taken up by plants from the soil and is essential for various metabolic processes.CarbonIronOxygenVitamin B12       During photosynthesis, autotrophs take in which of the following from the outside?Carbon dioxideSunlightWaterAll of the above       Apart from leaves, where else does gaseous exchange occur across the surface?Stems onlyRoots onlyStems and rootsFlowers only       In which mode of nutrition an organism derives its food from the body of another living organism without killing it?Saprotrophic nutritionParasitic nutritionHolozoic nutritionAutotrophic nutrition       The characteristic processes observed in anaerobic respiration are:i) Presence of oxygenii) Release of carbon dioxideiii) Release of energyiv) Release of lactic acidi), ii) onlyi), ii), iii) onlyii), iii), iv) onlyiv) only