FBISE Class 9th (SSC-l)
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FBISE Class 9th (SSC-l)
Answer: Cellular respiration breaks down glucose in cells to release energy stored as ATP.
Answer: Muscle cells reduce pyruvate to lactic acid when oxygen is unavailable.
Answer: NADP+ picks up hydrogen ions and electrons to form NADPH, which is used in the dark reaction.
Answer: Excess glucose is polymerized and stored in the plant as starch.
Answer: Yeast carries out alcoholic fermentation, producing ethanol and carbon dioxide from glucose.
Answer: Cellular respiration breaks down glucose and traps the released energy in ATP.
Answer: Carbohydrates produce equal volumes of CO2 and use equal volumes of O2, so the RQ is 1.
Answer: Carbon dioxide combines with RuBP and is quickly converted into 3-phosphoglyceric acid, a three-carbon compound.
Answer: The mitochondrion is the powerhouse of the cell where the Krebs cycle and electron transport chain occur.
Answer: Fats consume more oxygen than carbohydrates, giving an RQ of about 0.7.
Answer: Autotrophs such as green plants make their own food through photosynthesis.
Answer: RQ is the volume of CO2 produced divided by the volume of O2 consumed.
Answer: Glycolysis produces two pyruvate molecules, each entering the Krebs cycle once, so two turns occur per glucose.
Answer: Heterotrophs depend on other organisms for their food and energy.
Answer: When light is scarce it limits the rate of photosynthesis even if other factors are plentiful.
Answer: Photosynthesis builds complex glucose from simple molecules, so it is an anabolic reaction.
Answer: Water is split by light energy during the light reaction to release oxygen, H+ and electrons.
Answer: Two decarboxylation steps in each Krebs cycle turn release two CO2 molecules.
Answer: Respiration breaks down glucose into simpler products, so it is a catabolic reaction.
Answer: NADP+ is reduced to NADPH during the light reaction and is later used in the Calvin cycle.