HORMONES
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2.
3.
4.
5.
6.
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8.
KAPMAN LIFE SCIENCE ACADEMY MCQS
Maryland Mammoth is:
(a) Soya bean (b) Wheat (c) Tobacco
(d) rice
_______ appear to be responsible for
gravitropism.
(a) Statoliths (b) phytochromes
(c) Gibberellins (d) Cytokinins
An Rajasthani hunter was worried
about being attacked by grizzly tigers,
so he left the lights in his cabin on all
the time. Plants near the cabin flowered
a month early. Which of the following
best explains this?
(a) They must have been long-night
plants.
(b) The lights must have emitted far-red
light.
(c) They must have been long-day plants.
(d) They must have been short-day plants.
A certain short-day plant flowers when
days are less than 12 hours long. Which
of the following would cause it to
flower?
(a) a 9-hour night and 15-hour day with 1
minute of darkness after 7 hour.
(b) an 8-hr day and 16-hour night with a
flash of white light after 8 hr.
(c) a 13-hour night and 11-hour day with
1 minute of darkness after 6 hr.
(d) a 12-hour day and 12-hour night with
a flash of red light after 6 hr.
In the autumn, the amount of ____
increases and the amount of ____
decreases in fruit and leaf stalks,
causing a plant to drop fruit and leaves.
(a) ethylene . . . auxin
(b) gibberellin . . . abscisic acid
(c) cytokinin . . . abscisic acid
(d) auxin . . . ethylene
Plants growing in harsh environments
such as deserts, sand dunes, and arctic
tundra often reproduce vegetatively.
This is because
(a) There are few animals available to
pollinate them.
(b) They are members of plant families
that only reproduce asexually.
(c) Fruits would freeze or dry out in these
environments.
(d) Vegetative reproduction is not as risky
as making seeds.
In contrast to animals, plants exhibit
______ and _____.
(a) determinate growth . . . persistent
morphogenesis
(b) indeterminate growth . . . are not
capable of morphogenesis throughout
their lifespan
(c) indeterminate growth . . . persistent
morphogenesis
(d) growth . . . morphogenesis
In shoots, branching is inhibited by
_____ from the tip of a growing shoot,
but this effect is countered by _____
from the roots.
(a) cytokinins . . . auxins
(b) gibberellins . . . ethylene
(c) auxins . . . cytokinins
(d) gibberellins . . . abscisic acid
9. The correct arrangement of the
meristematic tissue of an embryo is
(a) a ring of lateral meristem surrounding
apical meristem.
(b) a ring of procambium surrounding a
ring of meristem surrounding a ring of
protoderm.
(c) a ring of hypocotyl surrounding a ring
of radicle surrounding a ring of epicotyl.
(d) a ring of protoderm surrounding a ring
of ground meristem surrounding
procambium.
10. Carbon dioxide joins the photosynthetic
pathway in
(a) PS I (b) PS II (c) light reaction (d) dark
reaction.
11. The substrate for photorespiration is
(a) phosphoglyceric acid
(b) glycolate
(b) serine
(d) glycine
12. A very efficient converter of solar
energy with net productivity of 204
kg/m2 or more is the crop
(a) Wheat (b) sugarcane (c) rice (d) bajra.
13. During monsoon, the rice crop of
eastern states of India shows lesser
yield due to limiting factor of
(a) C02 (b) light(c) temperature
(d) Water.
14. In presence of hypo osmotic body
fluids, inhibition of ….occurs in
production of hormone
a) antidiuretic
b) diuretic
c) aldosterone
d) adrenaline
15. In raising blood pressure, two
hormones whose effect is synergistic are
a) cortisol and corticosterone
b) cortico-steroids and
corticosterone
c) aldosterone and androgenic
hormones
d) adrenaline and non-adrenaline
Part C MCQs
1. Gibberellins promote seed germination.
Giberellins are weakly acidic growth
hormones having ring structure and
which causes cell elongation of intact
plants in general and increased
internodal length of genetically dwarfed
plants. Giberellins are synthesized in
the apical shoot buds, root tips and
developing
seeds.
During
seed
germination, especially of cereals
giberrelin stimulates the production of
some messenger RNAs and then
hydrolytic enzymes like amylases,
lipases, proteases. The
enzymes
solubilize the reserve food of the seed.
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HORMONES
2.
KAPMAN LIFE SCIENCE ACADEMY MCQS
Which of the following statement is not
True about Gibberelins ?
A. Gibberellins promote seed
germination while inducing various
enzymes
B. Gibberellins also stimulates stem
elongation
C. Gibberellins are derived from
tyrosine
D. Gibberellins synthesized in shoot
buds.
Ejected electron is trapped by FRS
(ferrodoxin reducing substance) which
is an unknown oxidation – reduction
system. The electron is now transferred
to a non-heme iron protein called
ferrodoxin (Fd) from which electron is
transferred to another intermediate.
Ferredoxin is a constituent of
(a) PS I (b) PS II (c) Hill reaction (d)P680.
2.
3.
6.
3. During light reaction of photosynthesis,
which of the following phenomenon is
observed during cyclic phosphorylation
as well as non-cyclic phosphorylation?
a)
b)
c)
d)
4.
5.
Release of O2
Formation of ATP
Formation of NADPH
Involvement of PS I and PS II
pigment systems.
Because T3 and T4 are lipid soluble,
they diffuse through the plasma
membrane into interstitial fluid and
then
into
the
blood.
T
4 normally is secreted in greater
quantity than T3, but T3 is several
times more potent. Moreover, after T4
enters a body cell, most of it is
converted to T3 by removal of one
iodine. Which of the following
statements is/are right about thyroxin
1. T3 is main hormone
2. T3 is more potent
3. T4 is main hormone
4. T4 is more potent
a) 1 and 2
b) 1 and 4
c) 3 and 4
d) 2 and 3
Parathyroid hormone is the major
regulator
of
the
levels
of
calcium (Ca2+), magnesium (Mg2+),
and phosphate (HPO42) ions in the
blood. The specific action of PTH is to
increase the number and activity of
osteoclasts. The result is elevated bone
resorption, which releases ionic calcium
(Ca2+) phosphates (HPO42) into the
blood. PTH also acts on the kidneys.
First, it slows the rate at which Ca2+
and Mg2+ are lost from blood into
the urine. Second, it increases loss of
HPO42from
blood
into
the
urine. Statements are
1. PTH is regulated by pituitary
gland
7.
PTH is secreted by kidney
PTH is an anit-calcitonin
hormone
4. PTH
helps
to
reduce
phosphate in blood.
Right statements is/are
a) 1 and 2
b) 3 and 4
c) 3 only
d) 1 and 3
The pituitary gland (1) is located in the
cribriform plate of the ethmoid bone,
(2) is linked to the hypothalamus by the
infundibulum, (3) has a posterior
portion that contains axon terminals
from hypothalamic neurosecretory
cells, (4) produces releasing and
inhibiting hormones, (5) has a vascular
connection with the hypothalamus
known as the hypophyseal portal
system.
a) 1, 2, and 4
b) 2, 3, 4, and 5
c) 2, 3, and 5
d) 1, 2, 3, 4, and 5
e) 2, 4, and 5
Mr. Hernandez visited his doctor
complaining that he is constantly
thirsty and is “in the bathroom day and
night” relieving his bladder. The doctor
ordered blood and urine tests to check
for glucose and ketones, which were all
negative..?
A. ADH
B. ADH and Aldosterons
C. ACTH
D. ACTH and FSH
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