61. Which one from those given below
is the period for Mendel's hybridization experiments ?
1.1856-1863
2.1840 - 1850
3. 1857 - 1869
4.1870 – 1877
62. Good vision depends on adequate
intake of carotene rich food.
Select the best option from the
following statements.
(a) Vitamin A derivatives are formed
from carotene.
(b) The photopigments are embedded in
the membrane discs of the inner segment
(c) Retinal is a derivative of Vitamin
A.
(d) Retinal is a light absorbing part of all
the visual photopigments.
Options :
1. (a) and (b)
2. (a), (c) and (d) ,
3. (a) and (c)
4. (b), (c) and (d)
63. Which one of the following
statements is not valid for aerosols ?
1. They are harmful to human health
2. They alter rainfall and monsoon
patterns
3. They cause increased agricultural
productivity
4. They have negative impact on
agricultural land
64. A decrease in blood pressue/volume will
not cause the release of
1. Renin
2. Atrial Natriuretic Factor
3. Aldosterone
4. ADH
65. Homozygous purelines in cattle can
be obtained by:
1. mating of related individuals of
same breed.
2. mating of unrelated irdividuals of same
breed.
3. mating of individuals of different breed.
4. mating of individuals of different species.
66. The vascular cambium normally gives rise
to
1. Phelloderm
2. Primary phloem
3. Secondary xylem
4.Periderm
67. Which of the following statement
is correct ?
1.The ascending limb of loop of Henle is impermeable to water.
2. The descending limb of loop of Henle
is impermeable to water.
3. The ascending limb of loop of Henle is
permeable to water.
4. The descending limb of loop of Henle
is permeable to electrolytes.
68. Fruit and leaf drop at early stages can be
prevented by the application of:
1. Cytokinins
2. Ethylene
3. Auxirs
4. Gibberellic acid
69. A baby boy aged two years is admitted to
play school and passes through a dental check - up. The dentist observed that
the boy had twenty teeth. Which teeth were absent ?
1. Incisors
2. Canines
3. Pre-molars
4. Molars
70. An important characteristic that
Hemichordates share with Chordates is :
1. absence of notochord
2. ventral tubular nerve cord
3. Pharynx with gill slits
4. pharynx without gill slits
Answers:
61. 1. 1856-1863
62. 3. (a) and (c)
63. 3. They cause increased agricultural productivity
64. 2. Atrial Natriuretic Factor
65. 2. mating of unrelated irdividuals of same breed.
66. 3. Secondary xylem
67. 1.The ascending limb of loop of Henle is impermeable to water.
68. 4. Gibberellic acid
69. 3. Pre-molars
70. 3. Pharynx with gill slits