Match the following genes of the Lac operon
with their respective products :
(a ) i gene (i) θ-galactosidase
(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)

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

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

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

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

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

Under which of the following conditions will
there be no change in the reading frame of
following mRNA?
5'AACAGCGGUGCUAUU3'
(1) Insertion of G at 5th position
(2) Deletion of G from 5th position
(3) Insertion of A and G at 4th and 5th positions
respectively
(4) Deletion of GGU from 7th, 8th and 9th
positions

The concept of “Omnis cellula-e cellula”
regarding cell division was first proposed by
(1) Rudolf Virchow
(2) Theodor Schwann
(3) Schleiden
(4) Aristotle

What triggers activation of protoxin to active
Bt toxin of Bacillus thuringiensis in boll
worm?
(1) Body temperature
(2) Moist surface of midgut
(3) Alkaline pH of gut
(4) Acidic pH of stomach

Identify the correct pair representing the
causative agent of typhoid fever and the
confirmatory test for typhoid.
(1) Plasmodium vivax / UTI test
(2) Streptococcus pneumoniae / Widal test
(3) Salmonella typhi / Anthrone test
(4) Salmonella typhi / Widal test

What is the genetic disorder in which an
individual has an overall masculine
development gynaecomastia, and is sterile ?
(1) Turner's syndrome
(2) Klinefelter's syndrome
(3) Edward syndrome
(4) Down's syndrome

Polyblend, a fine powder of recycled modified
plastic, has proved to be a good material for
(1) Making plastic sacks
(2) Use as a fertilizer
(3) Construction of roads
(4) Making tubes and pipes

Which of these following methods is the most
suitable for disposal of nuclear waste?
(1) Shoot the waste into space
(2) Bury the waste under Antarctic ice-cover
(3) Dump the waste within rocks under deep
ocean
(4) Bury the waste within rocks deep below
the Earth's surface

Match the following hormones with the
respective disease
(a ) Insulin (i) Addison's disease
(b) Thyroxin (ii) Diabetes insipidus
(c) Corticoids (iii) Acromegaly
(d) Growth Hormone (iv) Goitre
(v) Diabetes mellitus
Select the correct option.
(a ) (b) (c) (d)
(1) (v) (i) (ii) (iii)
(2) (ii) (iv) (iii) (i)
(3) (v) (iv) (i) (iii)
(4) (ii) (iv) (i) (iii)

Select the correct option.
(1) 8th, 9th and 10th pairs of ribs articulate
directly with the sternum.
(2) 11th and 12th pairs of ribs are connected to
the sternum with the help of hyaline
cartilage.
(3) Each rib is a flat thin bone and all the ribs
are connected dorsally to the thoracic
vertebrae and ventrally to the sternum.
(4) There are seven pairs of vertebrosternal,
three pairs of vertebrochondral and two
pairs of vertebral ribs.