Biology - Plant Physiology
Exam Duration: 45 Mins Total Questions : 30
Resuuration plants like Selaginella and lichens remain air dry for considerable periods because they can absorb water from the slight downpour. by which physiological process, water is absorbed?
- (a)
Active absorption
- (b)
Passive absorption
- (c)
imbibition
- (d)
Osmosis
Deficiency symptoms of nitrogen an dpotassium are visit first in
- (a)
senescent leaves
- (b)
young leaves
- (c)
roots
- (d)
buds
Which of the following statements is wrong for glycolysis?
- (a)
it uses ATP
- (b)
it produces ATP
- (c)
End products are CO2 and water
- (d)
NADH is produced
When night temperature is low during winter season, the size of potato tuber will
- (a)
increase
- (b)
decrease
- (c)
Both (a) and (b)
- (d)
no effect
The plant substance which become inhibitory on accumulation are
- (a)
abscisic acid
- (b)
phenolic inhibitors
- (c)
auxins
- (d)
cytokinins
Oxygen content reduction makes the glycolyse (glycogenesis) intensity increased due to
- (a)
increase of ADP concentration in cell
- (b)
increase of NaD+ concentration in cell
- (c)
increase of ATP concentration in cell
- (d)
increase of concentration of peroxides and free redicals
A man returning to Chennai from Kashmir packed together nearly ripe apples below and green tomatoes above them.A few days later, he found that the tomatoes has turned red.The tomatoes would have not turned red if
- (a)
they were kept at the bottom layer in the box
- (b)
the were mixed with ripe apples
- (c)
there were no apples in the box
- (d)
some hay had been put in the box, while packing the fruits
The rate of transpiration directly depends on
- (a)
temperature
- (b)
pressure gradient
- (c)
turgor pressure and light
- (d)
diffusion pressure deficit
A non-purine compound showing cytokinin activity is
- (a)
zeatin
- (b)
dihydrozeatin
- (c)
benzimidazole
- (d)
None of these
Translocation of photosynthetic end products in sieve-tubes is
- (a)
305 mm/h
- (b)
3-5 cm/h
- (c)
1-15 cm/h
- (d)
60-100 cm/h
Pasteur effect can be studied in case of
- (a)
Nostoc
- (b)
Penicillium
- (c)
Pinnularia
- (d)
Saccharomyces
Net yield of ATP molecules in aerobic repiration during Kreb's cycle per glucose molecule is
- (a)
2 ATP molecules
- (b)
8 ATP molecules
- (c)
36 ATP molecules
- (d)
38 ATp molecules
Use of excessive fertilisers causes wilting due to
- (a)
endosmosis
- (b)
exosmosis
- (c)
imbibition
- (d)
osmosis
- (e)
None of these
In biochemical phase, fixation of carbon dioxide occurs by
- (a)
Rubisco
- (b)
PGA
- (c)
OAA
- (d)
PGAL
Water reaches xylem from root hairs by
- (a)
Apoplast pathway
- (b)
Symplast pathway
- (c)
Both (1) and (2
- (d)
Imbibition
In plants, glucose is usually stored as
- (a)
Sucrose
- (b)
Fructose
- (c)
Galactose
- (d)
Starch
The process of splitting of water molecules in photosynthesis is
- (a)
Electrolysis
- (b)
Thermolysis
- (c)
Hydrolysis
- (d)
Photolysis
Respiration involves breaking of------ bonds of complex compounds through oxidation within the cells, leading to release of considerable amount of
- (a)
C---C
- (b)
C--O
- (c)
C--H
- (d)
both ((2) and (3))
The initial slow growing phase is called
- (a)
log phase
- (b)
lag phase
- (c)
steady state phase
- (d)
senescence
Pomalin is a mixture of
- (a)
cytokinin + auxin
- (b)
gibberellin + auxin
- (c)
cytokinin + gibberellin
- (d)
cytokinin + ethylene
Which one of the following acids is a derivative of carotenoids?
- (a)
Indole-3-acetic acid
- (b)
Gibberellic acid
- (c)
Abscisic acid
- (d)
Indole butyric acid
During high light intensity, the chloroplasts align themselves
- (a)
in vertical position along lateral walls
- (b)
along tangential walls
- (c)
in centre and get scattered
- (d)
perpendicular to light.
Smaller, lipid soluble molecules diffuse faster through cell membrane, but the movement of hydrophilic substances is facilitated by certain transporters which are chemically
- (a)
proteins
- (b)
carbohydrates
- (c)
lipids
- (d)
phospholipids.
Refer to the given table and select the option that correctly fills the blanks in it.
Property | Simple diffusion | Facilitated transport | Active transport |
---|---|---|---|
Highly selective | A | Yes | B |
Uphill transport | No | C | Yes |
Requires ATP | No | D | Yes |
- (a)
A B C D No Yes No No - (b)
A B C D Yes Yes Yes No - (c)
A B C D No No No Yes - (d)
A B C D No Yes Yes Yes
In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Complex II and complex III of ETS are NADH dehydrogenase and cytochrome oxidase complex respectively.
Reason: Cytochrome c acts as a mobile carrier for transfer of electrons between complex II and III
- (a)
If both assertion and reason are true and reason is the correct explanation of assertion
- (b)
If both assertion and reason are true but reason is not the correct explanation of assertion
- (c)
If assertion is true but reason is false
- (d)
If both assertion and reason are false
Which of the following photosynthetic bacteria have both PS-I & PS-II?
- (a)
Purple sulphur bacteria
- (b)
Cyanobacteria
- (c)
Purple non sulphur bacteria
- (d)
Green sulphur bacteria
Which among the following is not a step in Calvin cycle?
- (a)
Carboxylation
- (b)
Reduction
- (c)
Photophosphorylation
- (d)
Regeneration
Phytochrome is responsible for
- (a)
Flowering
- (b)
Seed germination
- (c)
Transpiration
- (d)
Both (1) & (2)
Ureides are preferred forms for storage and transport of nitrogen in
- (a)
Triticum aestivum
- (b)
Solanum nigrum
- (c)
Glycine max
- (d)
Allium cepa
What is/are essential for imbibition to occur?
- (a)
Affinity between imbibant and imbibate
- (b)
Water potential gradient between imbibant and imbibate
- (c)
Low temperature condition
- (d)
More than one option is correct