71. Which of the
following immune responses is responsible for rejection of kidney graft?
(1) Auto-immune
response
(2) Humoral immune
response
(3) Inflammatory
immune response
(4) Cell-mediated
immune response
Answer (4) Cell-mediated immune
response
72. Use of an
artificial kidney during hemodialysis may result in :
(a) Nitrogenous waste build-up in the body
(b) Non-elimination
of excess potassium ions
(c) Reduced absorption of calcium ions from
gastro-intestinal tract
(d) Reduced RBC production Which of the following options is
the most appropriate?
(1) (a) and (b) are
correct
(2) (b) and (c) are
correct
(3) (c) and (d) are correct
(4) (a) and (d) are correct
Answer (3) (c) and (d) are correct
73. Which of the
following statements is correct?
(1) Cornea is an external, transparent and protective
proteinacious covering of the eye-ball.
(2) Cornea consists
of dense connective tissue of elastin and can repair itself.
(3) Cornea is convex, transparent layer which is highly
vascularised.
(4) Cornea consists of dense matrix of collagen and is the
most sensitive portion the eye.
Answer :(4) Cornea consists
of dense matrix of collagen and is the most sensitive portion the eye.
74. The frequency of
recombination between gene pairs on the same chromosome as a measure of the
distance between genes was explained by :
(1) T.H. Morgan (2)
Gregor J. Mendel (3) Alfred Sturtevant (4) Sutton Boveri
Ans: (3) Alfred Sturtevant
75. Match the
following genes of the Lac operon with their respective products : -
(a) i gene (i) galactosidaseb
(b) z gene (ii)
Permease
(c) a gene (iii)
Repressor
(d) y gene (iv) Transacetylase
Select the correct
option.
(a) (b) (c) (d)
(1) (i) (iii) (ii) (iv)
(2) (iii) (i) (ii)
(iv)
(3) (iii) (i) (iv) (ii)
(4) (iii) (iv) (i)
(ii)
Answer (3) (iii) (i) (iv) (ii)
76. It takes very
long time for pineapple plants to produce flowers. Which combination of
hormones can be applied to artificially induce flowering in pineapple plants
throughout the year to increase yield?
(1) Auxin and
Ethylene
(2) Gibberellin and Cytokinin
(3) Gibberellin and Abscisic acid
(4) Cytokinin and Abscisic acid
Answer (1) Auxin and Ethylene
77. Identify the
cells whose secretion protects the lining of gastro-intestinal tract from
various enzymes.
(1) Chief Cells (2)
Goblet Cells (3) Oxyntic Cells (4) Duodenal Cells
Answer : (2) Goblet Cells
78. Which of the
following can be used as a biocontrol agent in the treatment of plant disease?
(1) Trichoderma (2) Chlorella (3) Anabaena (4) Lactobacillus
Answer : (1) Trichoderma
79. Phloem in
gymnosperms lacks :
(1) Albuminous cells
and sieve cells
(2) Sieve tubes only
(3) Companion cells only
(4) Both sieve tubes and companion cells
Answer (4) Both sieve tubes and companion cells
80. Extrusion of
second polar body from egg nucleus occurs :
(1) after entry of
sperm but before fertilization
(2) after
fertilization
(3) before entry of
sperm into ovum
(4) simultaneously with first cleavage
Answer (1) after entry of sperm but before fertilization