79 .De vo nian pe riod of Palaeozoic era is pop u larly
known as
(a) age of invertebrates
(b) age of fishes
(c) age of amphibians
(d) age of terrestrial land plants
80 .At which stage of HIV in fec tion does one usu ally
shows symp toms of AIDS?
(a)Within 15 days of sexual contact with an infected person
(b)When the infected retrovirus enters host cells
(c)When HIV damages large number of helper T-lymphocytes
(d)When the viral DNA is produced by reverse transcriptase
81 .Which of the fol low ing state ment is not true about
Schwann cells?
I. Surround axon of myelinated nerve fibre.
II. Support muscle fibres.
III. Found in Haversian system of bones.
IV. Form base ment mem brane of ep i the lium.
Choose the correct code from the codes given below.
(a) Only I
(b) I, II and IV
(c) II, III and IV
(d) I, II, III and IV
82 .In an ac ci dent a per son’s hy po thal a mus re gion is
in jured. What would most likely disrupt
(a) short term memory
(b) executive function such as decision making
(c) regulation of body temperature
(d) coordination during locomotion
83 .Which of the fol low ing is true about phenylketonuria
(PKU)?
(a)They lack phenylalanine hydroxylase to change
phenylalanine to tyrosine
(b)Accumulation of phenylalanine and its metabolites damage
the brain and causes the disease
(c)The heterozygous individual is normal but carrier
(d)All of these
84 .A few nor mal seed lings of to mato were kept in a dark
room. Af ter a few days, they were found to have
be come white-col oured like al bi nos. Which of the
fol low ing terms will you use to de scribe them?
(a) Mutated (b) Embolised
(c) Etiolated (d) Defoliated
85 .Which of the fol low ing is not true about aves?
I. Birds are uricotelic with mesonephric kidney.
II. Bones are pneumatic and bone marrow present.
III. Skin is dry without glands except oil gland or green
glands.
IV. Fertilization is internal and are viviparous.
(a) I and II (b) I, II and IV (c) II and IV (d) I, III and IV
86 .Match the fol low ing col umns.
Column I Col umn II
A. Porogamy 1. Pollen tube enters by piercing the
integument.
B. Chalazogamy 2. Pollen tube enters through
micropylar end.
C. Mesogamy 3. Pollen tube enters through
chalazal end.
Codes
A B C A B C
(a) 2 3 1 (b) 1 2 3
(c) 3 2 1 (d) 1 3 2
87 .A man whose fa ther was col ourblind mar ries a woman,
who had a colourblind mother and nor mal fa ther. What
per cent age of male chil dren of this cou ple will be
colourblind?
(a) 100% (b) 75% (c) 50% (d) 25%
88 .If Men del had stud ied the seven traits us ing a plant
with 12 chro mo somes in stead of 14, in what way would
his in ter pre ta tion have been dif fer ent?
(a)He could have mapped the chromosomes
(b)He would have discovered blending or incomplete
dominance
(c)He would not have discovered the law of independent
assortment
(d)He would have discovered sex linkage
89 .Which one of the fol low ing state ment is cor rect?
(a) The seed in grasses is not endospermic
(b) Mango is a parthenocarpic fruit
(c) A proteinaceous aleurone layer is present in maize grain
(d) A sterile pistil is called a staminode
90 .Sa cred groove is one of the great as pect of in situ
con ser va tion. It is use ful in
(a) year round flow of water in rivers
(b) conserving rare and threatened species
(c) generating environmental awareness
(d) preventing soil erosionAnswers
1.(b) 2.(d) 3.(d) 4.(c) 5.(d) 6.(a) 7.(b) 8.(b) 9.(a) 10.(a)
11.(a) 12.(a) 13.(c) 14.(d) 15.(b) 16.(a) 17.(b) 18.(d) 19.(d) 20.(a)
21.(a) 22.(d) 23.(b) 24.(a) 25.(d) 26.(b) 27.(d) 28.(d) 29.(a) 30.(d)
31.(b) 32.(c) 33.(c) 34.(c) 35.(c) 36.(a) 37.(c) 38.(c) 39.(b) 40.(c)
41.(b) 42.(d) 43.(a) 44.(d) 45.(d) 46.(b) 47.(b) 48.(b) 49.(b) 50.(c)
51.(d) 52.(a) 53.(b) 54.(b) 55.(b) 56.(c) 57.(d) 58.(d) 59.(a) 60.(d)
61.(b) 62.(d) 63.(a) 64.(b) 65.(c) 66.(c) 67.(c) 68.(c) 69.(a) 70.(a)
71.(d) 72.(c) 73.(b) 74.(a) 75.(c) 76.(b) 77.(c) 78.(b) 79.(b) 80.(c)
81.(c) 82.(c) 83.(d) 84.(c) 85.(c) 86.(a) 87.(d) 88.(c) 89.(c) 90.(b)