α-Ketoglutarate dehydrogenase brings about
1.Oxidation and decarboxylation
2.Reduction
3.Oxidation
4.Decarboxylation
2,4-D causes ...
1.Delay in senescence
2.Bolting
3.Increase in branches
4.Increased growth of all parts
2,4-D causes ...
1.Delay in senescence
2.Bolting
3.Increase in branches
4.Increased growth of all parts
A chemical believed to be involved in flowering is ... .
1.Gibberellin
2.Kinetin
3.Florigen
4.IBA
A semipermeable membrane allows the diffusion of
1.Solutes
2.Solvents
3.Both solutes and solvents
4.None of the above
Ability of Venus Fly Trap to capture insects is due to ...
1.Specialised "muscle-like" cells
2.Chemical stimulation by prey
3.Rapid turgor pressure changes
4.Passive process requiring no special ability on the apart of the pant
Active transport occurs
1.Against concentration gradient and requires ATP
2.Against concentration gradient but does not require ATP
3.Along concentration gradient but requires ATP
4.Along concentration gradient but does not require ATP
All of the following are plant growth inhibitors except;
1.ABA
2.Dormin
3.Ethylene
4.IAA
An essential element is that which
1.Is found in plant ash
2.Is available in soil
3.Improves health of plant
4.Is irreplaceable and indispensable for growth of plants
Apical dominance is caused by ...
1.Abscisic acid in lateral bud
2.Cytokinin in leaf tip
3.Gibberellin in lateral buds
4.Auxin in shoot tip
Arithmetic growth curve is linear because
1.One daughter cell remains meristematic and others differentiates and mature
2.Both daughter cells remains meristematic
3.) Both daughter cells get matured
4.None of the above
As compared to anaerobic respiration, the energy gained during aerobic respiration is
1.8 times
2.14 times
3.15times
4.19 times
Assertion Dried seeds of Pea are kept in tin, water is poured over them up to upper level. A lid is put tight over it. Within an hour the lid is blown off Reason Due to rapid cell division in Pea see
1.If both the assertion and reason are true and reason explains the assertion
2.If both the assertion and reason are true but reason does not explain the a
3.If assertion is true but reason is false
4.If assertion is false but reason is true.
Assertion: Nitrogen fixing bacteria of legume root nodules survive in oxygen depleted cells. Reason: Leghaemoglobin completely removes oxygen from nodule cells
1.If both the assertion and reason are true and reason explains the assertion
2.If both the assertion and reason are true but reason does not explain the a
3. If assertion is true but reason is false
4. If assertion is false but reason is true.
ATP is
1.Adenine triphosphate
2.Adenine tetraphosphate
3.Adenosine tetraphosphate
4.None of the above
Auxins are mainly produced by
1.Root apical meristem
2.Shoot apical meristem
3.Lateral meristem
4.Intercalary meristem
Bacteria that convert ammonia to nitrite belong to
1.Nitrosomonas
2.Nitrobacter
3.Mycobacterium
4.Pseudomonas
Biennials get changed into annuals by ...
1.Hormones
2.Photoperiodism
3.Grafting
4.Vernalisation
Bioassay for auxin is ..
1.) Dwarf maize test
2.Avena curvature test
3.Cell division test
4.Green leaf test
Brown heart disease is due to deficiency of
1.Boron
2.Iron
3.Potassium
4.Molybdenum
Bulliform cells in Grass leaves show
1.Growth movements
2.Tropic movements
3.Nastic movements
4.Turgor movements
C4 plants differ from C3 plants with respect to
1.Substrate which accepts carbon dioxide
2.First product
3.Number of ATP molecules consumed
4.All of the above
Carbohydrates, the most abundant biomolecules on earth are produced by
1.Some bacteria, algae and green plants
2.Fungi, algae and green plants
3.Viruses, fungi and bacteria
4.All bacteria, fungi and algae
Cell respiration is carried out by
1.Ribosomes
2.Golgi bodies
3.Mitochondria
4.Chloroplasts
Choose the wrong pair:
1.Auxin - to grow
2.Gibberllin - acidic
3.Caytokinin - cell divisen
4.ABA - Flowring hormons
Compensation point is the value of a factor where there is
1. Beginning of photosynthesis
2. Little photosynthesis
3.Photosynthesis equal to rate of respiration
4.Neither photosynthesis nor respiration
Count the number of true statements: (i) Application of gibberellins help early seed production in conifers. (ii) All synthetic auxins are widely used as herbicides. (iii) Kinetin promotes cytokin
1.1
2.2
3.3
4.4
Denitrification is carried out by
1.Nitrosomonas
2.Nitrosococcus
3.Nitrobacter
4.Pseudomonas
Difference between osmotic pressure and turgor pressure is
1.DPD
2.Transpiration pull
3.Osmotic potential
4.Solute potential
Direction of conduction of food through phloem is
1.From below upwards
2.From tip to bottom
3.Phloem never conducts food
4.From leaves to roots
During photorespiration, the oxygen consuming reaction(s) occur in
1.Stroma of chloroplast and peroxisomes.
2.Grana of chloroplasts and peroxisomes.
3.Stroma of chloroplasts.
4.Stroma of chloroplasts and mitochondria
Effect of auxin diffusing from apical bud on lateral shoots is known as
1.promoting effect
2.compensatory effect
3.inhibitory effect
4.supporting effect
Electrons lost by PS II are regained from
1.CO2
2.O2
3.H2O
4.None of the above
Element which is a component of proteinaceous materials and protoplasm is
1.Potassium
2.Magnesium
3.Nitrogen
4.Oxygen
Essential macronutrients are
1. Manufactured during photosynthesis
2. Produced by growth hormones
3.Absorbed by soil
4.Produced by enzymes
Exchange of substances between a cell and its environment is due to
1.Diffusion
2.Osmosis
3.Active transport
4.All of the above
Find out the true statements about vernalization: (i) It is the promotion of flowering by a period of low temperature (ii) It prevents precocious reproductive development early in the growing season
1.(i), (ii) and (iii).
2.(i) and (iii).
3.(ii) (iii) and (iv)
4.(i), (iii) and (iv)
Flash of light in dark inhibits flowering in ..
1.SDP
2.LDP
3.LSDP
4.DNP
Flowering in short day plants is induced by
1.Short days and interrupted long nights
2.Short days and uninterrupted long nights
3.Long days and interrupted short nights
4.Long days and uninterrupted short nights
Function of leghaemoglobin during biological nitrogen fixation in root nodules of legumes is to
1.Convert atmospheric nitrogen to ammonia
2.Convert ammonia to nitrite
3.Transport oxygen for activity of nitrogenase
4.Protect nitrogenase from oxygen
Function of red pigment leghaemoglobin present in root nodules of leguminous plants is to regulate
1.Co2 supply in cells
2.Mo supply to cells
3.O2 suplly to cells
4.None of the above
Gene responsible for nitrogen fixation is
1.Nif
2.Nitrogenase
3.Yeast alanine tRNA synthatase
4.RNA synthatase
Guttation is mainly due to
1.Root pressure
2.Osmosis
3.Transpiration
4.Imbibition
How many molecules of NADH are produced when four molecules of phosphoglyceraldehyde are converted into four molecules of pyruvate
1.2
2.8
3.6
4.4
How many of the following statements are true: (a) NAD mainly involved in catabolic pathway. (b) NADP mainly involved in anabolic pathway. (c) Non – cyclic electron transport is a multidirectional
1.One
2.Two
3.Three
4.Four
How many pigments are responsible for the colour of a plant leaf?
1.One
2.Two
3.Three
4.Four
Identify the following: (i) They have a special type of leaf anatomy. (ii) They tolerate a high range of temperature. (iii) They show responses to high light intensities. (iv) They lack photorespi
1.C2 plants
2.C3 plants
3.CAM plants
4.C4 plants
In a plant subjected to continuous red light phytochrome will show ...
1.Increased synthesis
2.Decreased level
3.Destruction
4.Destruction and synthesis remain in balance
In C4 photosynthesis, both C4 and C3 cycles are involved. Identify the catalytic function of RUBISco in C4 cycle
1. Oxygenation of RUBP.
2.Carboxylation of PEP.
3.Carboxylation of RuBp.
4.No function
In geometrical growth (from beginning to last), the correct sequence of growth phases and their occurrence are:
1.Log phase → Lag phase → Asymptote
2.Asymptote → Log phase → Lag phase
3.Lag phase → Exponential phase → Asymptote
4.Lag phase → Exponential phase → Log phase.
In mitochondria, protons accumulate in
1.Inter membrane space
2.Inner membrane
3.Matrix
4.Outer membrane
In which type reactions related to plant photosynthesis, peroxisomes are involved
1.Glycolytic cycle
2.Calvin cycle
3.Bacterial photosynthesis
4.Glyoxylate cycle
Inorganic nutrients are present in the soil as
1.Atoms
2.Molecules
3.Epectrically charged ions
4.Colloids
Leaf fall occurs when content of
1.Abscisic acid decreases
2.Auxin decreases
3.Auxin increases
4.Gibberellin decreases
Mannitol is storage food in
1.Chara
2.Gracilaria
3.Porphyra
4.Fucus
Minerals are absorbed in the form of
1.Compounds
2.Minerals
3.Ions
4.Mixtures
Nitrifying bacteria convert
1.Ammonia to nitrate
2.Nitrogen into soluble form
3.Nitrate to nitrogen
4.Ammonia to nitrogen
On the basis of the information mentioned, select the correct name of phytohormones for a,b and c respectively: (i) Hormone (a) helps in initiation of root and root hair formation at low concentratio
1.a-auxin, b-Gibberellin, c-Ethylene
2.a-Cytokinin, b-Zeatin, c-ABA
3.a-IAA, b-Ethylene, c-Cytokinin.
4.a-Ethylene, b-Gibberellin, c-ABA.
One hormone promotes abscission of flowers while the other delay senescence of fruits. These are respectively:
1.Auxin and Cytokinin.
2.Ethylene and Abscisic acid
3.Abscisic acid and Ethylene
4.Ethylene and Gibberellic acid
One of these is herbicide ...
1.IAA
2.NAA
3.GA3
4.2,4-D
Opening of flower and drooping of bud are ...
1.Hyponasty
2.Epinasty
3.Curvature movement
4.Spontaneous movements
Optimum temperature for photosynthesis is
1.35° - 40°C
2. 25° - 35°C
3.20° - 25°C
4.10° - 15°C
Oxidation of one molecule of glucose in aerobic respiration produces
1.2 ATP
2.8 ATP
3.16 ATP
4.38 ATP
Oxidative phosphorylation refers to
1.Anaerobic production of ATP
2.Citric acid cycle production of ATP
3.Production of ATP by chemiosmosis
4.Alcoholic fermentation
Parthenocarpic fruit cannot be produced by application of ...
1.IAA
2.2,4-D
3.ABA
4.IBA
Path of water movement from soil to xylem is
1.Metaxylem → Protoxylem → Cortex → Soil → Root hair
2.Pericycle → Soil → Root hair → Cortex → Endodermis
3.Soil → Root hair → Cortex → Endodermis → Pericycle
4.Cortex → Root hair → Endodermis → Pericycle → Proto
Photoperiodism is:
1.Germination of seed
2.Elongation of internodes
3.Flowering response towards light
4.Vegetative growth.
Photorespiration involves oxidation of
1.Chlorophyll a
2.PGA
3.RuBP
4.Both b and c
Photosynthesis is a process in which
1.ATP is generated
2.NADH is reduced to NAD
3.Oxidative phosphorylation occurs
4.CO2 is reduced
Pigment involved in regulation/photomorphogenesis response is ...
1.Phytochrome
2.Cytochrome
3.Xanthophyll
4.Chlorophyll
Pigment system I performs independently
1.Non-cyclic photophosphorylation
2. Cyclic photophosphorylation
3.Oxidative phosphorylation
4.Photolysis
Plant ash indicates
1.Silica absorbed by plants
2.Both mineral salts and organic matter
3.Mineral salt absorbed by plants
4.Organic matter of plant
Plant hormone associated with climacteric respiration:
1.Auxin
2.Caytokinin
3.Ethylene
4.Gibberellin
Plants absorb nitrogen as
1.Nitrate
2.Nitrite
3.Ammonia and urea
4.All of the above
Primary carboxylation occurs in C 3 and C 4 plants with the help of
1.PEP carboxylase and pyruvate carboxylase
2.PEP carboxylase and RuBP carboxylase
3.RuBP carboxylase and PEP carboxylase
4.RuBP carboxylase and pyruvate carboxylase
Rate of growth stops and plants die at a temperature of
1.20-30°C
2.10-20°C
3.35-40°C
4.5-10°C
Read the following four statements, A, B, C and D and select the right option having both correct statements. STATEMENTS: (A) Z scheme of light reaction takes place in presence of PS I only. (B) On
1.A and B are correct
2.B and C are correct
3.A and C are correct
4.B and D are correct
Read the following statements: (i) Cytokinin help in lateral shoot growth. (ii) Ethylene influences horizontal growth of seedlings. (iii) ABA plays an important role in seed development. (iv) Ethy
1.(i), (ii) and (iii) are correct.
2.(iii) and (iv) are correct
3.(ii), (iii) and (iv) are correct
4.(ii) and (iii) are correct
Statement a: Auxins promote apical dominance by suppressing activity of lateral buds Statement b: In moriculture, periodic pruning of shoot tips is done to makes Mulberry plants bushy
1.a and b correct with a being reason for b
2.a is correct, b is wrong
3.a is wrong, b is correct
4.Both a and b correct but a is not reason for b
The conditions necessary for vernalization are: (i) High temperature and water. (ii) Low temperature and water. (iii) Water and Carbon dioxide. (iv) Oxygen and water.
1.(i), (ii) and (iii)
2.(i) and (ii)
3.(ii) and (iv)
4.(i) and (iii)
The enzymes required for nitrogen fixation is
1.Nitrogen deaminase
2.Nitrodioxidase
3.Amino acid decarboxylase
4.Nitrogenase
The name zeatin was coined by ...
1.Skoog
2.Miller
3.Letham
4.Melvin
The other name of glycolysis is
1.Carbon pathway
2.TCA pathways
3.HMS pathways
4.EMP pathways
Treatment of seeds at low temperature under moist conditions for breaking their dormancy is ... .
1.Vernalisation
2.Chelation
3.Stratification
4.Scarification
When malic acid is respiratory substrate, the amount of CO2 released is
1. More than O2 consumed
2.Less than O2 released
3.Equal to O2 consumed
4.CO2 is not released
Which does not HSK pathway
1.Jowar
2.Maize
3.Sugarcane
4.Sunflower
Which group of three micronutrient elements affect both photosynthetic and mitochondrial electron transport?
1.Cu, Mn, Fe
2.Co, Ni, Mo
3.Ca, K, Na
4.Mn, Co, Ca
Which is not related to transpiration?
1.Absorption and distribution of minerals
2.Circulation of water
3.Temperature
4.Bleeding
Which of the following is a synthetic auxin?
1.IAA
2.NAA
3.IBA
4.ABA
Which of the following sequences correctly represents the flow of electrons during photosynthesis
1.H2O → photosystem I → photosystem II
2.NADPH → chlorophyll → Calvin cycle
3.H2O → NADPH → Calvin cycle
4.NADPH → O 2 → CO2
Which of the following stimulates growth or call enlargement? ..
1.Gibberellin
2.Auxin
3.Cytokinin
4.Ethylene
Which one is not a C4 plant?
1.Maize
2.Sugarcane
3.Bryophyllum.
4.Sorghum.
Which one is not a micronutrient?
1.B
2.Mo
3.Zn
4.Mg
Which one is not connected with transport across the cell membrane
1.Osmosis
2.Active transport
3.Diffusion
4.Surface tension
Which one is product of aerobic respiration?
1.Pyruvic acid
2.Lactic acid
3.Ethyl alcohol
4.Malic acid
Which one is used for defoliation of forest trees? ..
1.Phosphon D
2.Maleic hydrazide
3.AMO 1618
4.2, 4-D
Which plant hormone plays an important role in seed dormancy and germination respectively
1.Abscisic acid and Gibberellic acid
2.Ethylene and Abscisic acid
3.Ethylene and Gibberellic acid
4.Gibberellic and Ethylene acid
Who first suggested presence of growth regulatory chemicals in plants?
1.Went
2.Sachs
3.Darwin
4.Paal
Why are C4 plants able to photosynthesize with no apparent photorespiration?
1.They do not participate in the Calvin cycle.
2. They use PEP carboxylase to initially fix CO2 .
3.They are adapted to cold, wet climates.
4.They conserve water more efficiently.
Yield of Rice increase by
1.Sesbania
2.Anabaena
3.Bacillus subtilis
4.B. popilliae