Download PDF
Free download in PDF Plant Physiology Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries.
(1)
Transpiration is least in
[A]
good soil moisture
[B]
high wind velocity
[C]
dry environment
[D]
high atmospheric humidity
Answer: high atmospheric humidity
(2)
Phenyl mercuric acetate (PMA) results in
[A]
reduced transpiration
[B]
(a*e)=(a+e)
[C]
reduced respiration
[D]
killing of plants
Answer: reduced transpiration
(3)
Movement of leaves of sensitive plant, Mimosa pudica are due to
[A]
thermonasty
[B]
seismonasty
[C]
hydrotropism
[D]
chemonasty
(4)
Gibberellins promote
[A]
seed germination
[B]
seed dormancy
[C]
leaf fall
[D]
root elongation
(5)
Cut or excised leaves remain green for long if induced to root or dipped in
[A]
gibberellins
[B]
cytokinins
[C]
auxins
[D]
ethylene
(6)
Hormone primarily connected with cell division is
[A]
IAA
[B]
NAA
[C]
cytokinin/zeatin
[D]
gibberellic acid
(7)
Carbon dioxide joins the photosynthetic pathway in
[A]
PS I
[B]
PS II
[C]
light reaction
[D]
dark reaction
(8)
NADP+ is reduced to NADPH in
[A]
PS I
[B]
PS II
[C]
Calvin cycle
[D]
noncyclic photophosphorylation
Answer: noncyclic photophosphorylation
(9)
Phosphorous and nitrogen ions generally get depeleted in soil because they usually occur as
[A]
neutral ions
[B]
negatively charged ions
[C]
positively charged ions
[D]
both positively and negatively charged but disproportionate mixture
Answer: negatively charged ions
(10)
Which one is an essential mineral, not constituent of any enzyme but stimulates the activity of many enzymes
[A]
Zn
[B]
Mn
[C]
K
[D]
Mg
(11)
Which one increases in the absence of light?
[A]
uptake of minerals
[B]
uptake of water
[C]
elongation of internodes
[D]
ascent of sap
Answer: elongation of internodes
(12)
Mowing grass lawn facilities better maintenance because
[A]
wounding stimulates regeneration
[B]
removal of apical dominance and stimulation of intercalary meristem
[C]
removal of apical dominance
[D]
removal of apical dominance and promotion of lateral meristem
Answer: removal of apical dominance and stimulation of intercalary meristem
(13)
Leaf fall can be prevented with the help of
[A]
abscisic acid
[B]
auxins
[C]
florigen
[D]
cytokinins
(14)
Which of the following hormones can replace vernalisation?
[A]
auxin
[B]
cytokinin
[C]
gibuerellins
[D]
ethylene
(15)
Differentiation of shoot is controlled by
[A]
high auxin : cytokinin ratio
[B]
high cytokinin : auxin ratio
[C]
high gibberellin : auxin ration
[D]
high gibberellin : cytokinin ratio
Answer: high cytokinin : auxin ratio
(16)
Stomata of CAM plants
[A]
are always open
[B]
open during the day and close at night
[C]
open during the night and close during the day
[D]
never open
Answer: open during the night and close during the day
(17)
Which element is located at the centre of the porphyrin ring in chlorophyll?
[A]
calcium
[B]
magnesium
[C]
potassium
[D]
manganese
(18)
Which of the following is not caused by deficiency of mineral nutrition?
[A]
etiolation
[B]
shortening of internode
[C]
necrosis
[D]
none of these
(19)
What will be the effect on phytochrome in a plant subjected to continuous red light?
[A]
phytochrome synthesis will increase
[B]
level of phytochrome will decrease
[C]
phytochrome will be destroyed
[D]
first (b) then (a)
Answer: first (b) then (a)
(20)
If a tree flowers thrice in a year (Oct., Jan. and July) in Northern India, it is said to be
[A]
photo and thermo-insensitive
[B]
photo and thermo-sensitive
[C]
photosensitive but thermo-insensitive
[D]
thermosensitive but photo-insensitive
Answer: photo and thermo-insensitive
Take Mock Tests