PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The oxygen level is the same in both places because oxygen production by photosynthesis remains constant, regardless of location.
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The oxygen level in the city is higher because the exhaust gases from vehicles produce oxygen through the release of carbon dioxide.
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The oxygen level in the garden is higher because the plants are constantly releasing oxygen through photosynthesis.
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None of the above
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Detailed explanation-1: -The level of oxygen will be higher in the garden as the plants will use up carbon dioxide and release oxygen due to photosynthesis but the oxygen level will be low at the road as there will be high pollution and lesser plants.
Detailed explanation-2: -Extensive measurements have shown that the highest oxygen concentrations are found at high latitudes, where the ocean is cold, especially well-mixed and ventilated.
Detailed explanation-3: -Oxygen can be measured by counting bubbles evolved from pondweed, or by using the Audus apparatus to measure the amount of gas evolved over a period of time.
Detailed explanation-4: -Scientists estimate that roughly half of the oxygen production on Earth comes from the ocean. The majority of this production is from oceanic plankton-drifting plants, algae, and some bacteria that can photosynthesize. One particular species, Prochlorococcus, is the smallest photosynthetic organism on Earth.
Detailed explanation-5: -By actually measuring the volume of oxygen gas produced by a plant, you can work out the rate at which photosynthesis is happening. The more oxygen given off, the higher (or faster) the rate of photosynthesis.