NEET Biology - Plant Physiology
Exam Duration: 60 Mins Total Questions : 30
The shrinkage of the protoplast of a cell, from its cell wall under the influence of a hypertonic solution , is known as.
- (a)
endosmosis
- (b)
exosmosis
- (c)
plasmolysis
- (d)
deplasmolysis
Chemiosmotic theory of ATP synthesis in the chloroplastes and mitochondria is based on
- (a)
proton gradient
- (b)
accumulation of K+ ions
- (c)
accumulation of Na ions
- (d)
membrane potential
Induction of cell division and delay in senescence is done by
- (a)
cytokinin
- (b)
kinetin
- (c)
gibberellin
- (d)
auxin
Which of the following is most effective in photosynthesis ?
- (a)
Blue light
- (b)
Green light
- (c)
Red light
- (d)
Yellow light
Who demonstrated that the ascent of sap occurs due to the pulsatory activity of innermost cortical cells?
- (a)
Janse (1887)
- (b)
JC Bose (1923)
- (c)
Strasburger (1891)
- (d)
Molisch (1928-1929)
2, 4-D stands for
- (a)
2,4-dimethyl phenoxy acetic acid
- (b)
2-methyl-4-chloro phenoxy acetic acid
- (c)
2-chloro-4-methyl phenoxy acetic acid
- (d)
2,4-dimchloro phenoxy acetic acid
What is true ?
- (a)
PEP-pyruvate causes substrate level phosphorylation
- (b)
PS-II has oxygen producing complex
- (c)
NADPH has assimilatory power
- (d)
All of the above
For producing flowers, vernalisation overcomes
- (a)
thermophase
- (b)
photophase
- (c)
developmental phase
- (d)
growth phase
Hormone that promotes growth of lateral buds/has negative effect on apical dominance is
- (a)
cytokinin
- (b)
gibberellin
- (c)
auxin
- (d)
Both (b) and (c)
The basic feature of typical C4 -plants showing Kranz anatomy is the presence of
- (a)
chloroplasts in mesophyll and epidermal cells
- (b)
chloroplasts in bundle sheath
- (c)
rudimentary chloroplasts in bundle sheath cells and typical chloroplasts with well-formed grana in mesophyll cells
- (d)
typical chloroplasts with well-formed grana in bundle sheath cells and rudimentary chloroplasts in mesophyll cells
In a CAM plant, the concentration of organic acid
- (a)
increases during the day
- (b)
decreases or increases during the day
- (c)
increases during night
- (d)
decreases during any time
The inner wall of each guard cell towards the pore is
- (a)
Thick and rigid
- (b)
Thick and elastic
- (c)
Thin and elastic
- (d)
Thin and rigid
Anion-Cation balance in cells is determined by
- (a)
Potassium
- (b)
Boron
- (c)
Zinc
- (d)
Chlorine
Denitification is carried by bacteria such as
- (a)
Pseudomonas
- (b)
Thiobacillus
- (c)
Both (1) and (2)
- (d)
Nitrosornonas
The free-living nitrogen-fixing cyanobacteria is/are
- (a)
Anabaena
- (b)
Nostoc
- (c)
Both (1) and (2)
- (d)
Azotobacter
'Reclamation' and 'Little leaf' disease are caused by deficiency of
- (a)
Zn and Mo
- (b)
Cu and Zn
- (c)
Cu and B
- (d)
Mn and Cu
Which complex contains cytochromes a and a3 and two copper centres?
- (a)
NADH dehydrogenase complex
- (b)
FADH reductase
- (c)
cytochrome bc1 complex
- (d)
cytochrome c oxidase complex
Synthetic auxin(s) is/are
- (a)
NAA and 2,4-D
- (b)
2,4-D
- (c)
IAA
- (d)
IBA
Which one of the following pairs is not correctly matched?
- (a)
IAA - Cell wall elongation
- (b)
Abscisic acid - Stomatal closure
- (c)
Gibberellic acid - Leaf fall
- (d)
Cytokinin - Cell division
Boron in green plants assists in
- (a)
Sugar transport
- (b)
activation of enzymes
- (c)
acting as enzyme cofactor
- (d)
photosynthesis
Klinostal is employed in the study of
- (a)
osmosis
- (b)
growth movements
- (c)
photosynhesis
- (d)
respiration
The fruits can be left on the tree longer using GA so as to extend the market period. This is due to which function of GA?
- (a)
Bolting
- (b)
Delaying senescence
- (c)
Internodal elongation
- (d)
Inducing parthenocarpy
Identify A and B in the given diagram showing ATP synthesis in mitochondria.
- (a)
A = Mitochondrial matrix
B = Outer mitochondrial membrane - (b)
A = Mitochondrial matrix
B = Inner mitochondrial membrane - (c)
A = Cell cytoplasm
B = Inner mitochondrial membrane - (d)
A = Cell cytoplasm
B = Outer mitochondrial membrane
Which option is true for a fully turgid cell?
- (a)
OP= DPD
- (b)
OP= Zero
- (c)
DPD= Zero
- (d)
TP = Zero
The given experimental set-up is used
- (a)
to show that CO2 is required during photosynthesis
- (b)
to show that O2 is evolved during photosynthesis
- (c)
for nutrient solution culture
- (d)
to measure growth of a plant.
Protoplasmic elements are:
- (a)
C, H, O, P, N, S
- (b)
C,H,O, Fe, N
- (c)
N, S, Fe, P, K
- (d)
Fe, Mg, Ca, N, P
Select an incorrect match
- (a)
ABA-Violaxanthin
- (b)
Ethylene-Methionine
- (c)
GA3-Acetyl CoA
- (d)
Cytokinin-Terpenes
Plant growth is unique in being
- (a)
Closed
- (b)
Unlimited
- (c)
Diffuse
- (d)
Limited
Which of the following auxin is widely used as weedicide?
- (a)
IAA
- (b)
IBA
- (c)
2,4-D
- (d)
NAA
Translocation of photosynthates occur in the form of
- (a)
Sucrose
- (b)
Starch
- (c)
Glucose
- (d)
PGA