Sunday, January 5, 2014

PHOTOSYNTHESIS IN HIGHER PLANTS

1.    The most distinguishable anatomical feature of C4 plants
    1) Presence of bundle sheath around vascular bundles
    2) Absence of chloroplasts in mesophyll cells
    3) Presence of agranal chloroplasts in mesophyll cells
    4) Absence of grana in bundle sheath chloroplasts
2.    Choose wrong combination with respect to the location of enzymes in C4 plants
    1) PEP case-stroma of mesophyll cell chloroplast
    2) RUBISCO-stroma of bundle sheath cell chloroplast
    3) Malic enzyme-stroma of bundle sheath cell chloroplast
    4) Pyruvate dikinase-stroma of mesophyll cell chloroplast
3.    Excessive elongation of plants and poor development of leaves when they were grown in darkness is called
    1) Foolish seedling disease    2) Bolting
    3) Embolism        4) Etiolation
4.    In Photosynthetic ‘Quinone cycle’ the number of electrons transferred from PQH2 to Cytochrome b6 is
    1) One    2) Two
    3) Three    4) Four
5.    Warburg effect is              ( NEET )
    1) The enhancement effect of light on Photosynthesis
    2) The feed back inhibition in Photosynthesis
    3) The inhibitory effect of high CO2 on Photosynthesis
    4) The inhibitory effect of high O2 on Photosynthesis
6.    In an experiment that carbon dioxide available to a C3 plant was labelled with a radioactive isotope and the amount of radioactivity in the chloroplast was measured. As photosynthesis proceeded, in which of the following molecules did the radioactivity first appear ?
    1) PGAL    2) PEP
    3)  PGA    4) RuBP
7.    In an experiment, the carbon dioxide available to a C4 plant was labelled with a radioactive isotope and the amount of radioactivity in the chloroplast was measured. As photosynthesis proceeded, in which of the following molecules did the radioactivity first appear ?
    1) Oxaloacetic acid    2) PEP
    3) Malic acid    4) RuBP
8.    Which of the following statements about absorption spectrum is correct ?
    1) At blue region absorption peak of Chl-b is at lower wavelength than that of Chl-a
    2)At red region absorption peak of  Chl-a is more than that of Chl-b
    3) At blue region absorption peak of Chl-a is more than that of Chl-b
    4) At red region absorption peak of Chl-a forms at lower wavelength than that Chl-b
9.    The following compounds are intermediates in the pathway of photorespiration     ( NEET )
    I) Phosphoglycolate    II) Serine
    III) Glyoxylate    IV) Glycine
    The correct sequence of their appearance in the pathway is
    1) I, II, III, IV    2) I, III, IV, II
    3) II, I, III, IV    4) II, I, IV, III
10.    Consider the following event in the photochemical conversion of light energy into chemical energy by chlorophyll during photosynthesis
    I) Charge separation   
    II) Absorption of qantum of energy
    III) Ejection of electron
    IV) Transfer of light energy
    1) IV, II, I, II    2) I, III, IV, II
    3) II, I, III, IV    4) II, I, IV, III
11.    Which of the following kinds of plant fixes carbon dioxide by way of crassulacean acid metabolism
    1) Oak tree    2) Cactus
    3) Grass    4) Red alga
12.    Assertion (A) :- In C4 plants, the total energy requirement for fixing CO2 by the combined C4 and Calvin cycle is five ATP and two NADPH per CO2 fixed   
    Reason    (R) :- C4 plants, consumes two excess ATP per CO2 molecule transported in comparison to C3 plant
13.    Assertion (A) :- The two carboxylations in C4 plants are spatially separated
    Reason    (R) :- PEP carboxylation occurs in mesophyll cell and RUBP carboxylation occurs in bundle sheath cells in C4 plants
14.    Assertion (A) :- Quinone cycle helps in building up H+ concentration in the lumen of the thylakoids
    Reason    (R) :- CF facilitates the transfer of three H+ from lumen to stroma for the formation every ATP molecule
15.    Assertion (A) :- The optimum temperature for C4 pathway is 300C-450C        ( NEET )
    Reason    (R) :- C4 plants show Warburg effect
16.    Inhibition of photosynthesis in high concentration of oxygen is mainly due to
    1) Distribution of RuBP carboxylase
    2)  Inactivation of RuBP carboxylase
    3) non-synthesis of RuBP carboxylase
    4) RuBP carboxylase acting as oxygenase
17.    DCMU kills the herbs by         ( NEET )
    1) Inhibiting photoreaction II of photosynthesis
    2) Checking electron transport system in photosynthesis from is PS-II to is PS-I   
    3) Inhibiting photoreaction-I of photosynthesis
    4) All of the above
18.    Assertion (A) :- Oxygen is not evolved during cyclic electron transport
    Reason    (R) :- Photolysis of water does not occur during cyclic electron transport
19.    Assertion (A) :- DCMU does not inhibit cyclic electron transport            ( NEET )
    Reason    (R) :- Cyclic transport does not
    involve the Q cycle
20.    In C4 plants, the bundle sheath cells
    1) Have thin walls to facilitate gaseous exchange
    2) Have large intercellular space
    3) Are rich in PEP carboxylase
    4) Have a high density of chloroplasts
21.    Which of the following statements is true with regard to the light reaction of photosynthesis ?
    1) In PS-II the reaction centre chlorophyll a has an obsorption peak at 700 nm hence, is called P700
    2) In PS-I the reaction centre chlorophyll  a has an absorption maxima at 680 nm and is called P680
    3) Photosystems -I and II are involved in Z scheme
    4) Only Lamellae of  grana have PS-I and PS-II

key
    1) 4        2) 1      3) 4      4) 1      5) 4 
    6) 3      7) 1      8) 1      9) 2      10) 4 
    11) 2     12) 2     13) 1     14) 2     15) 3
    16) 4    17) 2    18) 1     19) 3     20) 4
    21) 3

No comments:

ASTHRA JUNIOR COLLEGE , VIJAYAWADA