Usman

Tag: lesson-5734

  • The oxygen released in photosynthesis comes mainly from:

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“ATP”,”Glucose”,”Carbon dioxide”,”Water”],”correct”:3,”type”:”mcq”,”explain”:”Splitting of water (photolysis) in the light reaction releases O₂.”}

  • Light-dependent reactions take place in the:

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“Stroma”,”Mitochondrial matrix”,”Nucleus”,”Thylakoid membranes”],”correct”:3,”type”:”mcq”,”explain”:”Photosystems and the electron transport chain sit in the thylakoid membrane.”}

  • The Calvin cycle runs in the:

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“Cell wall”,”Thylakoid lumen”,”Cytoplasm only”,”Stroma”],”correct”:3,”type”:”mcq”,”explain”:”CO₂ is fixed in the chloroplast stroma using ATP and NADPH from the light reaction.”}

  • The primary photosynthetic pigment is:

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“Xanthophyll only”,”Phytochrome”,”Anthocyanin”,”Chlorophyll a”],”correct”:3,”type”:”mcq”,”explain”:”Chlorophyll a is the reaction-centre pigment; others are accessory pigments.”}

  • ATP and NADPH produced in the light reaction are used to:

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“Build xylem”,”Split water again”,”Fix CO₂ into carbohydrate”,”Open stomata at night only”],”correct”:2,”type”:”mcq”,”explain”:”They power the Calvin cycle reduction of carbon.”}

  • RuBisCO catalyses:

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“Carboxylation of RuBP”,”Photolysis of water”,”Nitrogen fixation”,”Glycolysis”],”correct”:0,”type”:”mcq”,”explain”:”RuBisCO adds CO₂ to ribulose bisphosphate (RuBP), the key step of C3 fixation.”}

  • In C3 plants the first stable product of CO₂ fixation is:

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“3-phosphoglycerate (3-PGA)”,”Oxaloacetate (4C)”,”Pyruvate only”,”Glucose-1-phosphate”],”correct”:0,”type”:”mcq”,”explain”:”The 3-carbon acid 3-PGA is the first stable product of the C3 pathway.”}

  • Chlorophyll absorbs mainly:

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“Green light only”,”Blue and red light”,”Infrared only”,”UV-C only”],”correct”:1,”type”:”mcq”,”explain”:”Green is mostly reflected, which is why leaves look green; absorption peaks are in blue and red.”}

  • Accessory pigments mainly:

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“Fix nitrogen”,”Broaden the wavelengths that can be used”,”Carry water in xylem”,”Replace stroma”],”correct”:1,”type”:”mcq”,”explain”:”Carotenoids and others pass extra energy to chlorophyll a.”}

  • True or false: Photosynthesis converts light energy into chemical energy.

    {“lesson_id”:5734,”category_id”:0,”topic”:””,”choices”:[“True”,”False”],”correct”:0,”type”:”true_false”,”explain”:”Light energy is stored in sugars (and ATP/NADPH during the light phase).”}