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question_answer1) Assertion : \[{{C}_{4}}\]pathway of\[C{{O}_{2}}\]fixation is found in some tropical plants. Reason : In this pathway \[C{{O}_{2}}\]is fixed by 3C compound [AIIMS 1998]
question_answer2) Assertion : Six molecules of\[C{{O}_{2}}\] and twelve molecules of \[NADP{{H}^{+}}+{{H}^{+}}\]and 18 ATP are used to form one hexose molecule. Reason : Light reaction results in formation of \[ATP\]and \[NADP{{H}_{2}}\] [AIIMS 2002]
question_answer3) Assertion : Rhoeo leaves contain anthocyanin pigments in epidermal cells. Reason : Anthocyanins are accessory photosynthetic pigments. [AIIMS 2003]
question_answer4) Assertion : There is a decrease in photosynthesis, if the photosynthetic cells are illuminated by light of\[{{P}_{680}}\]nm or more wavelength. Reason : In red drop phenomenon the rate of photosynthesis decreases.
question_answer5) Assertion : The concentration of\[{{O}_{2}}\]in the atmosphere is inhibitory to photosynthesis. Reason : Oxygen inhibitory effect is due to Warburg effect.
question_answer6) Assertion : If\[C{{O}_{2}}\]is increasing continuously, there will be a increase in photosynthesis. Reason : \[C{{O}_{2}}\]is the main substrate of photosynthesis.
question_answer7) Assertion : CAM plants lack structural compartmentation of leaf, as found in\[{{C}_{4}}\]plants. Reason : Stomata of CAM plants are open during the day.
question_answer8) Assertion : Plants utilizing first RuBP in\[C{{O}_{2}}\] fixations are called \[{{C}_{3}}\]plants. Reason : Plants utilizing first PEP in \[C{{O}_{2}}\]fixations are called \[{{C}_{4}}\]plants.
question_answer9) Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species. Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved. [AIIMS 2004]
question_answer10) Assertion : The stromal thylakoids are rich in both PS I and PS II. Reason : The granal membranes are rich in ATP synthetase.
question_answer11) Assertion : Cyclic photophosphorylation synthesizes ATP. Reason : ATP synthesise in cyclic photophosphorylation is not associated with NADPH formation.
question_answer12) Assertion : Oxidative phosphorylation requires oxygen. Reason : Oxidative photophosphorylation occurs in mitochondria.
question_answer13) Assertion : Each molecule of ribulose-1, 5-bisphosphate fixes one molecule of\[C{{O}_{2}}\]. Reason : Three molecules of NADPH and two ATP are required for fixation of one molecule of\[C{{O}_{2}}\].
question_answer14) Assertion : \[C{{O}_{2}}\]is transported from mesophyll cells to bundle sheath of chloroplasts in \[{{C}_{4}}\]plants. Reason : RuBP is called final acceptor of \[C{{O}_{2}}\]in \[{{C}_{4}}\]plants.
question_answer15) Assertion : One molecule of \[C{{O}_{2}}\] is fixed to give 686 kcal in photosynthesis. Reason : To form a hexose, six molecules of \[C{{O}_{2}}\]are fixed.
question_answer16) Assertion : In the formation of one glucose, 686,000 calories energy are produced. Reason : The energy is provided by a total of 12 NADPH and 18 ATP.
question_answer17) Assertion : Sciophytes require higher light intensity than heliophytes. Reason : Sciophytes grow below the canopy of trees.
question_answer18) Assertion : The movement of photosynthates is unidirectional. Reason : Movement of photosynthates occurs with the water.
question_answer19) Assertion : Plants utilize 5-10% of the absorbed water in photosynthesis. Reason : Reduced leaf hydration decrease the photosynthesis.
question_answer20) Assertion : Photorespiration is completed in three cell organelles. Reason : Peroxisomes, glyoxysomes and desmosomes are involved in photorespiration.
question_answer21) Assertion : The atmospheric concentration of \[C{{O}_{2}}\]at which photosynthesis just compensates for respiration is referred to as \[C{{O}_{2}}\] compensation point. Reason : The \[C{{O}_{2}}\]compensation point is reached when the amount of \[C{{O}_{2}}\] uptake is less than that generated through respiration because the level of \[C{{O}_{2}}\] in the atmosphere is more than that required for achieving \[C{{O}_{2}}\] compensation point.
question_answer22) Assertion : \[{{C}_{4}}\]photosynthetic pathway is more efficient than the \[{{C}_{3}}\]pathway. Reason : Photorespiration is suppressed in \[{{C}_{4}}\] plants.
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