questions for NCERT Biology class 11

SOLVED OBJECTIVE QUESTIONS


01.    The maximum growth occurs in
         (1)  Exponential phase   (2)  Lag phase                  (3)  Stationary phase   (4)  Senescent phase
02.    The role of auxin is to
         (1)  Cause abscission of leaves and fruits               (2)  Prevent abscission of leaves and fruits
         (3)  Promote stomatal closure                                (4)  Promote dormancy
03.    Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone
         (1)  Cytokinin               (2)  Abscisic acid             (3)  Ethylene              (4)  Auxin
04.    Which of the following is not true about auxins
         (1)  It inhibits lateral growth                                  (2)  It promotes stem elongation
         (3)  It promotes cell division                                 (4)  It causes epinasty
05.    Bakanae disease in the rice plants is caused by
         (1)  Gibberellic acid                                              (2)  Indole acetic acid
         (3)  Zeatin                                                            (4)  2, 4-Dichlorophenoxy acetic acid    
06.    Plant hormone which removes apical dominance and promotes growth of lateral buds
         (1)  Auxins                   (2)  Cytokinins                 (3)  Florigen               (4)  Gibberellins
07.    The 2, 4-D is an effective
         (1)  Fungicide               (2)  Rodenticide               (3)  Weedicide           (4)  Wormicide
08.    Gibberellins cause
         (1)  Curvature of coleoptile                                   (2)  Elongation of internodes
         (3)  Initiation of lateral roots                                 (4)  Cell division
09.    Genetic dwarfism can be overcome by
         (1)  Gibberellin             (2)  Auxin                        (3)  ABA                   (4)  Ethylene
10.    The abscisic acid is synthesized via
         (1)  EMP pathway                                                (2)  Mevalonic acid pathway
         (3)  PP pathway                                                    (4)  Glyocylate pathway
11.    Pigment responsible for photomorphogentic response is
         (1)  Carotene                 (2)  Cytochrome               (3)  Xanthophyll         (4)  Phytochrome
12.    The phenomenon of vernalisation was described for the first time by
         (1)  Went                      (2)  Lysenko                    (3)  Kurosawa            (4)  Aristotle
13.    Indole-3-acetic acid, called heteroauxin, was first isolated from
         (1)  Human urine           (2)  Corn germ oil             (3)  Fusarium             (4)  Rhizopus
14.    One of the following is a growth regulator but not a hormone
         (1)  IAA                       (2)  GA2                                        (3)  2, 4-D                  (4)  Gibberellin   
15.    Petal discolouration in pollinated orchids is caused by
         (1)  Ethylene                 (2)  ABA                         (3)  Morphactins        (4)  Vitamins
16.    Which of the following is called an antigibberellin?
         (1)  Auxin                     (2)  ABA                         (3)  Ethylene              (4)  Cytokinin
17.    The plants whose seeds are known to have the longest viability period is
         (1)  Carica papaya                                               (2)  Nelumbo nucifera
         (3)  Zizyphus mauritiana                                       (4)  Triticum vulgare
18.    Which of the following control the flowering in long day plants and sex expression in certain species?
         (1)  Cytokinins              (2)  Auxins                      (3)  Antiauxins           (4)  Gibberellins
19.    IAA generally inhibits growth of
         (1)  Roots                     (2)  Leaves                       (3)  Shoots                 (4)  Plants in general
20.    Which ion is extruded into the apoplast by auxin action during cell wall extension?
         (1)  K+                          (2)  NA+                                        (3)  Mg++                   (4)  H+
21.    Ethylene inhibits
         (1)  Epinasty                                                        (2)  Leaf expansion    
         (3)  Root and stem elongation                               (4)  Cellulase activity
22.    Abscisic acid is manufactured in
         (1)  Shoot                      (2)  Root tips                    (3)  Young leaves       (4)  Mature leaves
23.    Cytokinins are formed in
         (1)  Stems                     (2)  Leavess                     (3)  Fruits                  (4)  Roots
24.    The classical experiments on vernalization were conducted on
         (1)  Hyoscyamus           (2)  Nicotiana                   (3)  Triticum              (4)  Hordeum
25.    Which of the following hormones is a derivative of carotenoids?
         (1)  ABA                      (2)  CK                            (3)  GA                      (4)  None of these




























ANSWERS TO SOLVED OBJECTIVE QUESTIONS

01.
(1)
02.
(2)
03.
(4)
04.
(4)
05.
(1)
06.
(2)
07.
(3)
08.
(2)
09.
(1)
10.
(2)
11.
(4)
12.
(2)
13.
(1)
14.
(3)
15.
(1)
16.
(2)
17.
(2)
18.
(4)
19.
(1)
20.
(4)
21.
(3)
22.
(4)
23.
(4)
24.
(1)
25.
(1)

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