done 11th Biology Photosynthesis in Higher Plants

• question_answer1)
  By looking at a plant externally can you tell whether a plant is C3 or C4? Why and how?
  View Answer play_arrow

• question_answer2)
  By looking at which internal structure of a plant can you tell whether a plant is C3 or C4? Explain. 
  View Answer play_arrow

• question_answer3)
  Even though a very few cells in a plant carry out the biosynthetic-Calvin pathway, yet they are highly productive. Can you discuss why?  
  View Answer play_arrow

• question_answer4)
  RuBisCO is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCO carries out more carboxylation in plants?  
  View Answer play_arrow

• question_answer5)
  Suppose there were plants that had a high concentration of chlorophyll-b, but lacked chlorophyll-fl, would it carry out photosynthesis? Then why do plants have chlorophyll-b and other accessory pigments? 
  View Answer play_arrow

• question_answer6)
  Why is the colour of a leaf kept in the dark frequently yellow or pale green? Which pigment do you think is more stable? 
  View Answer play_arrow

• question_answer7)
  Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why? 
  View Answer play_arrow

• question_answer8)
  The following figure shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions (i) At which point/s (A, B or C) in the curve is light a limiting factor? (ii) What could be the limiting factor/s in region A? (iii) What do C and D represent on the curve?  
  View Answer play_arrow

• question_answer9)
   Give comparison between the following (i) C3 and C4-pathways (ii) Cyclic and non-cyclic photophosphorylation (iii) Anatomy of leaf in C3 and C4-plants  
  View Answer play_arrow

• question_answer10) Which metal ion is a constituent of chlorophyll? (a) Iron                                 (b) Copper                          (c) Magnesium                  (d) Zinc

  View Answer play_arrow

• question_answer11)   Which pigment acts directly to convert light energy to chemical energy? (a) Chlorophyll-a               (b) Chlorophyll-h             (c) Xanthophyll                 (d) Carotenoid

  View Answer play_arrow

• question_answer12)   Which range of wavelength (in nm) is called Photosynthetically Active Radiation (PAR)? (a) 100-390                          (b) 390-430                         (c) 400-700                          (d) 760-100,00

  View Answer play_arrow

• question_answer13)   Which light range is most effective in photosynthesis? (a) Blue                                (b) Green                            (c) Red                                  (d) Violet

  View Answer play_arrow

• question_answer14)   Chemosynthetic bacteria obtain energy from (a) sun                               (b) infrared rays (c) organic substances         (d) inorganic chemicals

  View Answer play_arrow

• question_answer15)   Energy required for ATP synthesis in PS II comes from (a) proton gradient                         (b) electron gradient      (c) reduction of glucose        (d) oxidation of glucose

  View Answer play_arrow

• question_answer16)   During light reaction in photosynthesis the following are formed (a) ATP and sugar                                                             (b) hydrogen,  and sugar (c) ATP, hydrogen donor and                                (d) ATP, hydrogen and  donor

  View Answer play_arrow

• question_answer17)   Dark reaction in photosynthesis is called so because . (a) it can occur in dark also                                           (b) it does not depend on light energy (c) it cannot occur during day light                            (d) it occurs more rapidly at night

  View Answer play_arrow

• question_answer18) PEP is primary  acceptor in (a)  plants                     (b) ?3 plants                        (c)  plants                           (d) both  and  plants

  View Answer play_arrow

• question_answer19)   Splitting of water is associated with (a) photosystem I                                                            (b)lumen of thylakoid (c) both photosystem I and II                                     (d) inner surface of thylakoid membrane

  View Answer play_arrow

• question_answer20)   The correct sequence of flow of electrons in the light reaction is PS II, plastoquinone, cytochromes, PS I, ferredoxin PS I, plastoquinone, cytochromes, PS II, ferredoxin PS I, ferredoxin, PS II PS I, plastoquinone, cytochromes, PS II, ferredoxin

  View Answer play_arrow

• question_answer21)     The enzyme that is not found in a  plant is (a) RuBP carboxylase     (b) PEP carboxylase         (c) NADP reductase          (d) ATP synthase Thinking Process plants are those plants which have calvin cycle to produce glucose molecules in dark reaction.  cycle is found in all photosynthesising plants. Some plants have problem in fixing atmospheric  because of deviation to property of RuBP carboxylase oxygenase enzyme. So they have evolved  mechanism.

  View Answer play_arrow

• question_answer22)   The reaction that is responsible for the primary fixation of  is catalysed by (a) RuBP carboxylase                                                      (b) PEP carboxylase (c) RuBP carboxylase and PEP carboxylase            (d) PGA synthase

  View Answer play_arrow

• question_answer23)   When  is added to PEP, the first stable product synthesised is (a) pyruvate                                                                       (b) glyceraldehyde-3-phosphate (c) phosphoglycerate                                                     (d) oxaloacetate

  View Answer play_arrow

• question_answer24)   Examine the figure (a) Is this structure present in animal cell or plant cell? (b) Can these be passed on to the progeny? How? (c) Name the metabolic processes taking place in the places marked (A) and (5).

  View Answer play_arrow

• question_answer25)   Based on the above equation, answer the following questions (a) Where does this reaction take place in plants? (b) What is the significance of this reaction?

  View Answer play_arrow

• question_answer26)   Cyanobacteria and some other photosynthetic bacteria don't have chloroplasts. How do they conduct photosynthesis?

  View Answer play_arrow

• question_answer27)   (a) NADP reductase enzyme is located on ......... . (b) Breakdown of proton gradient leads to release of ..........

  View Answer play_arrow

• question_answer28)   Can girdling experiments be done in monocots? If yes. How? If no, why not?

  View Answer play_arrow

• question_answer29)   water  Glyceraldehyde 3-phosphate Analyse the above reaction and answer the following questions (a) How many molecules of ATP and NADPH are required to fix one molecule of ? (b) Where in the chloroplast does this process occur?

  View Answer play_arrow

• question_answer30)   Does moonlight support photosynthesis? Find out.

  View Answer play_arrow

• question_answer31)   Some of these terms/chemicals are associated with the ?4 cycle. Explain. (a) Hatch Slack pathway             (b) Calvin cycle     (c) PEP carboxylase                 (d) Bundle sheath cells

  View Answer play_arrow

• question_answer32)   Where is NADP reductase enzyme located in the chloroplast? What is the role of this enzyme in proton gradient development?

  View Answer play_arrow

• question_answer33)   ATPase enzyme consists of two parts. What are those parts? How are they arranged in the thylakoid membrane? Conformational change occur in which part of the enzyme?

  View Answer play_arrow

• question_answer34)   Which products formed during the Light reaction of photosynthesis are used to drive the dark reaction?

  View Answer play_arrow

• question_answer35)   What is the basis for designating  and  pathways of photosynthesis?

  View Answer play_arrow

• question_answer36)   Succulents are known to keep their stomata closed during the day to check transpiration. How do they meet their photosynthetic requirements?

  View Answer play_arrow

• question_answer37)   Chlorophyll-'o' is the primary pigment for the light reaction. What are accessory pigments? What is their role in photosynthesis?

  View Answer play_arrow

• question_answer38)   Do reactions of photosynthesis called, as 'Dark Reaction" need light? Explain

  View Answer play_arrow

• question_answer39)   How are photosynthesis and respiration related to each other?

  View Answer play_arrow

• question_answer40)   If a green plant is kept in dark with proper ventilation, can this plant carry out photosynthesis? Can anything be given as supplement to maintain its growth or survival?

  View Answer play_arrow

• question_answer41)   Photosynthetic organisms occur at different depths in the ocean. Do they receive qualitatively and quantitatively the same light? How do they adapt to carry out photosynthesis under these conditions.

  View Answer play_arrow

• question_answer42)   In tropical rain forests, the canopy is thick and shorter plants growing below it, receive filtered light. How are they able to carry out photosynthesis?

  View Answer play_arrow

• question_answer43)   What conditions enable RuBisCO to function as an oxygenase? Explain the ensuing process.

  View Answer play_arrow

• question_answer44)   Why does the rate of photosynthesis decrease at higher temperatures?

  View Answer play_arrow

• question_answer45)   Explain how during light reaction of photosynthesis, ATP synthesis is a chemiosmotic phenomenon.

  View Answer play_arrow

• question_answer46)   Find out how Melvin Calvin worked out the complete biosynthetic pathway for synthesis of sugar.

  View Answer play_arrow

• question_answer47)   Six turns of Calvin cycle are required to generate one mote of glucose. Explain.

  View Answer play_arrow

• question_answer48)   Complete the flow chart for cyclic photophosphorylation of the photosystem-I.

  View Answer play_arrow

• question_answer49)   In what kind of plants do you come across "Kranz anatomy? To which conditions are those plants better adapted? How are these plants better adapted than the plants, which lack this anatomy?

  View Answer play_arrow

• question_answer50)   A process is occurring throughout the day, in T organism. Cells are participating in this process. During this process ATP,  and water are evolved. It is not a light dependent process. (a) Name the process. (b) Is it a catabolic or an anabolic process? (c) What could be the raw material of this process?

  View Answer play_arrow

• question_answer51)   Tomatoes, carrots and chillies are red in colour due to the presence of one pigment. Name the pigment. Is it a photosynthetic pigment?

  View Answer play_arrow

• question_answer52)   Why do we believe chloroplast and mitochondria to be semi-autonomous organelle?

  View Answer play_arrow

• question_answer53)   Observe the diagram and answer the following. (a) Which group of plants exhibit these two types of cells? (b) What is the first product of ?4 cycle? (c) Which enzyme is there in bundle sheath cells and mesophyll cells?

  View Answer play_arrow

• question_answer54)   A cyclic process is occurring in  plant, which is light dependent and needs . This process doesn't produce energy rather it consumes energy. (a) Can you name the given process? (b) Is it essential for survival?                                              (c) What are the end products of this process? (d) Where does it occur?

  View Answer play_arrow

• question_answer55)   Suppose Euphorbia and maize are grown in the tropical area. (a) Which one of them do you think will be able to survive under such conditions? (b) Which one of them is more efficient in terms of photosynthetic activity? (c) What difference do you think are there in their leaf anatomy?

  View Answer play_arrow

• question_answer56)   Is it correct to say that photosynthesis occurs only in leaves of a plant? Besides leaves, what are the other parts that may be capable of carrying out photosynthesis? Justify.

  View Answer play_arrow

• question_answer57)   The entire process of photosynthesis consists of a number of reactions. Where in the cell do each of these take place?                     (a) Synthesis of ATP and NADPH ......... .                                (b) Photolysis of water.......... (c) Fixation of  ......... .                                          (d) Synthesis of sugar molecule .......... (e) Synthesis of starch ..........

  View Answer play_arrow

• question_answer58)   Which property of the pigment is responsible for its ability to initiate the process of photosynthesis? Why is the rate of photosynthesis higher in the red and blue regions of the spectrum of light?

  View Answer play_arrow

• question_answer59)   What can we conclude from the statement that the action and absorption spectrum of photosynthesis overlap? At which wavelength do they show peaks?

  View Answer play_arrow

• question_answer60)   Under what conditions are  plants superior to ?

  View Answer play_arrow

• question_answer61)   In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll-o, answer the following (a) What does the action spectrum indicate? How can we plot an action Spectrum? Explain with an example. (b) How can we derive an absorption spectrum for any substance? (c) If chlorophyll-o is responsible for light reaction of photosynthesis, why do the action spectrum and absorption spectrum not overlap?

  View Answer play_arrow

• question_answer62)   What are the important events and end products of the light reaction?

  View Answer play_arrow

• question_answer63)   In the diagram shown below label A, B, C. What type of phosphorylation is possible in this?

  View Answer play_arrow

• question_answer64)   Why is the RuBisCo enzyme more appropriately called RUBP carboxylase-oxygenase and what important role does it play in photosynthesis?

  View Answer play_arrow

• question_answer65)   What special anatomical features are displayed by leaves of  plants? How do they provide advantage over the structure of  plants?

  View Answer play_arrow

• question_answer66)   Name the two important enzymes of  and  pathway, respectively What important role do they play in fixing ?

  View Answer play_arrow

• question_answer67)   Why is RuBisCo enzyme the most abundant enzyme in the world?

  View Answer play_arrow

• question_answer68)   Why does not photorespiration take place in  plants?  

  View Answer play_arrow