-
question_answer1)
In plants, growth is:
A)
Restricted to certain regions or structure done
clear
B)
Irreversible done
clear
C)
Change in size done
clear
D)
All of the above done
clear
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question_answer2)
Growth is primarily affected by two climatic factors which are:
A)
Light and temperature done
clear
B)
Temperature and relative humidity done
clear
C)
Light and wind done
clear
D)
Rainfall and temperature done
clear
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question_answer3)
Which of the following instrument can be used to record plant growth by seconds?
A)
Arc auxanometer done
clear
B)
Arc indicator done
clear
C)
Space marker disc done
clear
D)
Crescograph done
clear
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question_answer4)
Plant growth is ultimately regulated by:
A)
Environmental cues done
clear
B)
Hormones done
clear
C)
Signal transduction pathways done
clear
D)
The plant's genome done
clear
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question_answer5)
The process in which mature differentiated cells reverse to meristematic activity to form callus is called:
A)
Cytodifferentiation done
clear
B)
redifferentiation done
clear
C)
Dedifferentiation done
clear
D)
differentiation done
clear
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question_answer6)
Which one of the following is primarily concerned with cell division?
A)
\[G{{A}_{3}}\] done
clear
B)
IAA done
clear
C)
Cytokinin done
clear
D)
IBA done
clear
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question_answer7)
The discovery of gibberellins is related with which one of the following?
A)
Blast disease of rice done
clear
B)
Bakanae disease of rice done
clear
C)
Early blight disease of potato done
clear
D)
Rust disease of wheat done
clear
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question_answer8)
Which of the following light receptors is responsible for absorbing blue and ultraviolet light?
A)
Phytochrome \[{{\operatorname{P}}_{r}}\] done
clear
B)
Photochrome \[{{\operatorname{P}}_{fr}}\] done
clear
C)
Cryptochrome done
clear
D)
Phototropin done
clear
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question_answer9)
Match the column-I with column-II and choose the correct option.
| Column-I | | Column-II |
A. | Formative | I. | Plastic extension through the enzymatic loosening of microfibrils |
B. | Phase of enlargement | II. | Cell develops into special or particular type of cells. |
C. | Phase of differentiation | III. | New cells are produced by mitosis |
A)
A-I; B-II; C-III done
clear
B)
A-I; B-III; C-II done
clear
C)
A-III; B-II; C-I done
clear
D)
A-III; B-I; C-II done
clear
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question_answer10)
In short day plants (SDP) flowering is induced by:
A)
Photoperiod less than 12'hours. done
clear
B)
Photoperiod shorter than initial value and uninterrupted long night. done
clear
C)
Short photoperiod and interrupted long night. done
clear
D)
Long night done
clear
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question_answer11)
Most appropriate temperature for vernalization is:
A)
\[1-6{}^\circ C\] done
clear
B)
\[7{}^\circ C\] done
clear
C)
\[-6{}^\circ C\] done
clear
D)
\[0{}^\circ C\] done
clear
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question_answer12)
Cell elongation in intemode regions of the green plants takes place due to:
A)
Ethylene done
clear
B)
Indole acetic acid done
clear
C)
Cytokinin done
clear
D)
Gibberellins done
clear
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question_answer13)
An enzyme that can stimulate germination of barley seeds is:
A)
Protease done
clear
B)
Invertase done
clear
C)
a-amylase done
clear
D)
Lipase done
clear
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question_answer14)
The natural plant hormones were first isolated from:
A)
Corn germ oil and human urine. done
clear
B)
Cotton fruits, spinach leaves and rice plants. done
clear
C)
Human urine and rice seedlings. done
clear
D)
Spinach leaves and fungus Gibberella. done
clear
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question_answer15)
Cytokinins are known to:
A)
Inhibit cytoplasmic movement done
clear
B)
Help in retention of chlorophyll done
clear
C)
Influence water movement done
clear
D)
Promote abscission layer formation done
clear
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question_answer16)
Apical dominance means:
A)
Suppression of growth of apical bud by axillary buds. done
clear
B)
Suppression of growth of axillary buds by the presence of apical bud. done
clear
C)
Stimulation of growth of axillary buds by removal of apical bud. done
clear
D)
Inhibition of growth of axillary buds by removal of apical bud. done
clear
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question_answer17)
Maximum amount of growth in root occurs:
A)
In the presence of light. done
clear
B)
At its apex. done
clear
C)
Behind the apex. done
clear
D)
In the presence of soil. done
clear
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question_answer18)
Auxin inhibits the growth of:
A)
Apical bud done
clear
B)
Lateral axillary buds done
clear
C)
Roots on stem cutting done
clear
D)
Parthenocarpic development of fruits done
clear
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question_answer19)
The growth rate is highest in:
A)
Red light done
clear
B)
White light done
clear
C)
Green light done
clear
D)
Blue light done
clear
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question_answer20)
Leaf movement in Mimosa pudica (Sensitive plant) due to:
A)
Nerve impulsion done
clear
B)
Delicate leaves done
clear
C)
Loss of tissue done
clear
D)
Turgor change in leaf base done
clear
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question_answer21)
Ageing is retarded by:
A)
ABA done
clear
B)
CKN done
clear
C)
GA done
clear
D)
\[{{C}_{2}}{{H}_{4}}\] done
clear
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question_answer22)
Auxin causes cells to absorb water from hyper-tonic media because:
A)
It lowers transpiration rate. done
clear
B)
It increases rate of cellular respiration causing more production of ATP molecules thus facilitating active water absorption. done
clear
C)
It increases solute potential of the cells. done
clear
D)
It increase rate of transpiration. done
clear
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question_answer23)
The hormone reducing transpiration rate by inducing stomatal closure is:
A)
ABA done
clear
B)
Ethylene done
clear
C)
Cytokinin done
clear
D)
Auxin done
clear
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question_answer24)
Richmond-Lang effect is concerned with:
A)
Delay in senescence done
clear
B)
Breaking dormancy done
clear
C)
Suppression of apical dominance done
clear
D)
Cell elongation done
clear
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question_answer25)
Which is employed for artificial ripening of banana fruits?
A)
Auxin done
clear
B)
Coumarin done
clear
C)
Ethylene done
clear
D)
Cytokinin done
clear
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question_answer26)
The movement of auxin is largely:
A)
Both acropetal and basipetal done
clear
B)
Basipetal done
clear
C)
Centripetal done
clear
D)
Acropetal done
clear
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question_answer27)
I.A.A. mainly inhibits growth of:
A)
Root done
clear
B)
Leaf done
clear
C)
Shoot done
clear
D)
Generally whole plant done
clear
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question_answer28)
Match column-I with column-II and select the correct answer using the codes given below.
|
Column-I |
|
Column-II |
A. |
Xanthium |
I. |
Its flower opens at higher temperature. |
B. |
Crocus |
II. |
Earlier and higher obtained by keeping its seed at low temperature between 1 \[{}^\circ C\]and \[10{}^\circ C\] |
C. |
Millet |
III. |
Growth regulator can be obtained from one of the parts of it. |
D. |
Coconut |
IV. |
It produces flower, when period of light available is less than critical period. |
A)
A - IV; B - I; C - II; D - III done
clear
B)
A - IV; B - II; C - III; D - I done
clear
C)
A - IV; B - III; C - II; D - I done
clear
D)
A - I; B - II; C - III; D - IV done
clear
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question_answer29)
The names of many organisms are associated with classical studies in some areas of biology. Which of the following does not show such matching?
A)
Pea-Laws of heredity done
clear
B)
Acetabularia-Relationship between nucleus and cytoplasm done
clear
C)
E. coli - Genetic engineering done
clear
D)
Barley seeds- Role of phytochrome done
clear
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question_answer30)
Which of the following statements are false?
(i) \[{{C}_{2}}{{H}_{4}}\] breaks seed and bud dormancy. |
(ii) ABA stimulates the opening of stomata. |
(iii) Cytokinin is primarily concerned with cell division. |
(iv) ABA is synergistic to GA. |
A)
(i),(ii), and (iii) done
clear
B)
(i) and (ii) done
clear
C)
(ii) and (iv) done
clear
D)
(i) and (iii) done
clear
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question_answer31)
The plants bend towards light because:
A)
The stem likes sunlight. done
clear
B)
The roots send the message to the stem to do so. done
clear
C)
Due to secretion of growth promoting substances at the tip. done
clear
D)
The food material is translocated from leaves to stem causing bending. done
clear
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question_answer32)
Phytotron is device for:
A)
Induction of mutations done
clear
B)
Measuring wind velocity done
clear
C)
Measuring electron flow done
clear
D)
Growing plants under controlled conditions. done
clear
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question_answer33)
Which of the following hormones can replace vernalisation?
A)
Ethylene done
clear
B)
Gibberellins done
clear
C)
Cytokinins done
clear
D)
Auxins done
clear
View Solution play_arrow
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question_answer34)
When a dark period in SDP is interrupted by a brief exposure of light, the plant:
A)
Will not flower at all done
clear
B)
Flowers immediately done
clear
C)
Gives more flowers done
clear
D)
Turns into LDP done
clear
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question_answer35)
Stem elongation is affected by:
A)
Gibberellin and florigen done
clear
B)
Auxin and gibberellin done
clear
C)
Florigen and kinin done
clear
D)
Kinin and auxin done
clear
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question_answer36)
Parthenocarpic tomato fruits can be produce
A)
Raising the plants from vernalised seeds. done
clear
B)
Treating the plants with phenylmercuric acetate. done
clear
C)
Removing androecium of flowers before pollen grains are released. done
clear
D)
Treating the plants with low concentrations of gibberellic acid and auxins. done
clear
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question_answer37)
Induction of rooting in stem cutting by auxin treatment would be beneficial in which of the following?
A)
Marchantia done
clear
B)
Wheat done
clear
C)
Cuscuta done
clear
D)
Bougainvillea done
clear
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question_answer38)
The growth of the plant body takes place by:
A)
Lateral meristems done
clear
B)
Apical meristems done
clear
C)
Both apical and lateral meristems done
clear
D)
None of the above done
clear
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question_answer39)
Match Column-I with Column-II and select the correct answer using the codes given below:
| Column-I | | Column-II |
A. | C. Darwin and F. Darwin | I. | Cytokinin |
B. | Miller and Skoog | II. | ABA |
C. | Addicott et. al. | III. | \[{{C}_{2}}{{H}_{4}}\] |
D. | Kurosawa | IV. | Auxin |
E. | | V. | GA |
A)
A-IV; B-I; C-II; D-V done
clear
B)
A-IV; B-I; C-V; D-II done
clear
C)
A-III; B-I; C-II; D-IV done
clear
D)
A-V; B-IV; C-I; D-III done
clear
View Solution play_arrow
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question_answer40)
What will be the effect on phytochrome in a plant subjected to continuous red light?
A)
Level of phytochrome decreases done
clear
B)
Phytochrome is destroyed done
clear
C)
Phytochrome synthesis increases done
clear
D)
Destruction and synthesis of phytochrome remain in equilibrium. done
clear
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question_answer41)
Which one of the following is a long day plant?
A)
Bajra done
clear
B)
Soyabean done
clear
C)
Tobacco done
clear
D)
Wheat done
clear
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question_answer42)
Seedless fruits can be obtained by treating the unpollinated ovaries with:
A)
Colchicine done
clear
B)
Sucrose solution done
clear
C)
Hormones done
clear
D)
Pure lanolin done
clear
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question_answer43)
Which of the following test will you perform to demonstrate the presence of gibberellin?
A)
Bolting of cabbage done
clear
B)
Differentiation of shoots in tobacco callus culture done
clear
C)
Rapid division in carrot cells done
clear
D)
Elongation of Avena coleoptile done
clear
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question_answer44)
Which of the following controls flowering I long day plants and sex expression in certain species?
A)
Auxin done
clear
B)
Cytokinin done
clear
C)
Gibberellin done
clear
D)
Ethylene done
clear
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question_answer45)
Which combination of gases is suitable for fruit ripening?
A)
80% \[C{{O}_{2}}\] and 20% \[C{{H}_{2}}\] done
clear
B)
80% \[C{{H}_{4}}\] and 20% \[C{{O}_{2}}\] done
clear
C)
80% \[C{{O}_{2}}\] and 20% \[{{O}_{2}}\] done
clear
D)
80% \[{{C}_{2}}{{H}_{4}}\] and 20% \[C{{O}_{2}}\] done
clear
View Solution play_arrow
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question_answer46)
To avoid excessive water loss during severe drought stress, the closure of stomata is signaled by the production of:
A)
IAA done
clear
B)
NAA done
clear
C)
ABA done
clear
D)
IBA done
clear
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question_answer47)
In tissue culture, roots can be induced by:
A)
No cytokinin and only auxins done
clear
B)
Higher concentration of cytokinin and lower concentration of auxins. done
clear
C)
Lower concentration of cytokinin and higher concentration of auxins. done
clear
D)
Only cytokinin and no auxins. done
clear
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question_answer48)
Which one of the following is a naturally occurring growth inhibitor?
A)
IAA done
clear
B)
ABA done
clear
C)
NAA done
clear
D)
GA done
clear
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question_answer49)
"Foolish Seedling or Bakane" disease of rice led to the discovery of:
A)
IAA done
clear
B)
GA done
clear
C)
ABA done
clear
D)
2, 4-D done
clear
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question_answer50)
Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in:
A)
Vessels and tracheid differentiation done
clear
B)
Leaf abscission done
clear
C)
Annual plants done
clear
D)
Floral parts done
clear
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question_answer51)
Which of the following triggers seed germination?
A)
Seeds imbibe in water. done
clear
B)
Seeds released from fruit. done
clear
C)
Seeds undergo chemical changes. done
clear
D)
All of the above done
clear
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question_answer52)
The stimulus for geotropism in roots is perceived by:
A)
Root cap done
clear
B)
Quiescent centre done
clear
C)
Root tip done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer53)
In callus culture, roots can be induced by the supply of:
A)
Auxin done
clear
B)
Cytokinin done
clear
C)
Gibberellin done
clear
D)
Ethylene done
clear
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question_answer54)
Which of the following shows the correct graph of arithmetic growth?
A)
B)
C)
D)
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question_answer55)
Exponential growth cannot be sustained for much time due to :
(i) limited space and nutrient. |
(ii) Accumulation of toxic agent. |
(iii) Unlimited space and nutrient. |
(iv) Accumulation of nutrient agent. |
A)
(i) and (iii) done
clear
B)
(iii) and (iv) done
clear
C)
(i) and (ii) done
clear
D)
(iv) and (ii) done
clear
View Solution play_arrow
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question_answer56)
Which one is a short day plant?
A)
Brassica campestris done
clear
B)
Raphanus sativus done
clear
C)
Glycine max done
clear
D)
Papaver somniferum done
clear
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question_answer57)
One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?
A)
Long day done
clear
B)
Darkness neutral done
clear
C)
Day neutral done
clear
D)
Short day done
clear
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question_answer58)
What is the site of vernalisation?
A)
Stem done
clear
B)
Leaves done
clear
C)
Roots done
clear
D)
Apical meristem done
clear
View Solution play_arrow
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question_answer59)
Maryland Mammoth Tobacco is a short day plant. Its critical duration of darkness is 10 hours. Under which of the following conditions will Maryland mammoth tobacco not flower?
A)
B)
C)
D)
View Solution play_arrow
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question_answer60)
What will be the effect on phytochrome in a plant subjected to continuous red light?
A)
Level of phytochrome decreases done
clear
B)
Phytochrome is destroyed done
clear
C)
Phytochrome synthesis increases done
clear
D)
Destruction and synthesis of phytochrome remain in equilibrium. done
clear
View Solution play_arrow
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question_answer61)
If a flash of light is provided in the middle of dark period to a SDP then the plant is likely
A)
To flower done
clear
B)
Not to flower done
clear
C)
Produce more flowers done
clear
D)
None of the above done
clear
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question_answer62)
Which of the following statement regarding Gibberellin are correct?
(I) \[G{{A}_{3}}\] is used to speed up the mailing process in brewing industry. |
(ii) \[G{{A}_{3}}\] is a commercially available gibberellin. |
(iii) Spraying juvenile conifers with \[G{{A}_{s}}\] hastens maturity, thus leading to early seed production. |
(iv) \[G{{A}_{3}}\] cannot increase the length of internode of sugar cane. |
A)
(i), (ii), and (iii) done
clear
B)
(i) and (ii) done
clear
C)
(ii) and (iv) done
clear
D)
(i) and (iii) done
clear
View Solution play_arrow
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question_answer63)
Which of the following statements are incorrect options.
(i) Primary growth involves increase in girth of plants. |
(ii) Increase in girth of plants occurs due to apical meristem. |
(iii) Secondary growth of plants occurs due to lateral meristem. |
(iv) Vascular cambium and cork cambium are the lateral meristems of plants. |
(v) Elongation of a plant along the axis is called primary growth. |
A)
(i) and (ii) done
clear
B)
(iii) and (iv) done
clear
C)
(iv) and (v) done
clear
D)
(i) and (v) done
clear
View Solution play_arrow
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question_answer64)
Which of the following does not normally occur when an etiolated seedling is exposed to light?
A)
Chlorophyll synthesis begins. done
clear
B)
The rate of shoot elongation increases. done
clear
C)
The hypocotyl hook straightens (in species with a hypocotyl hook). done
clear
D)
Phytochrome \[{{\operatorname{P}}_{r}}\] is converted to\[{{\operatorname{P}}_{fr}}\]. done
clear
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question_answer65)
Which plant hormone promotes seed, bud dormancy and causes stomatal closure?
A)
IAA done
clear
B)
Abscisic acid done
clear
C)
GA done
clear
D)
Cytokinin done
clear
View Solution play_arrow
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question_answer66)
Which of the following hormone breaks bud dormancy of potato tuber?
A)
Gibberellin done
clear
B)
IAA done
clear
C)
ABA done
clear
D)
Zeatin done
clear
View Solution play_arrow
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question_answer67)
Dwarfness can be controlled by treating the plant with:
A)
Cytokinin done
clear
B)
Gibberellic acid done
clear
C)
Auxin done
clear
D)
Antigibberellin done
clear
View Solution play_arrow
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question_answer68)
Florigen is produced in the region of:
A)
Leaves done
clear
B)
Fruit done
clear
C)
Root done
clear
D)
Trunk done
clear
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question_answer69)
Cell elongation in internodal regions of the green plants takes place due to:
A)
Indole acetic acid done
clear
B)
Cytokinins done
clear
C)
Gibberellins done
clear
D)
Ethylene done
clear
View Solution play_arrow
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question_answer70)
Which one increases in the absence of light?
A)
Uptake of minerals done
clear
B)
Uptake of water done
clear
C)
Elongation of internodes done
clear
D)
Ascent of sap done
clear
View Solution play_arrow
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question_answer71)
The potent weed killer is:
A)
Gibberellin done
clear
B)
2, 4-D done
clear
C)
Abscisic acid done
clear
D)
Ethylene done
clear
View Solution play_arrow
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question_answer72)
Which one of the following acids is a derivative of carotenoids?
A)
Indole-3 -acetic acid done
clear
B)
Gibberellic acid done
clear
C)
Abscisic acid done
clear
D)
Indole butyric acid done
clear
View Solution play_arrow
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question_answer73)
Which of the following is not characteristic of changes associated with winter dormancy in many species of temperate plants?
A)
Development of wax-covered bud scales done
clear
B)
High concentration of abscisic acid in buds done
clear
C)
Decrease in solute concentration of sap done
clear
D)
Leaf abscission done
clear
View Solution play_arrow
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question_answer74)
Which of the following growth substance act as a stimulant during nodule formation in leguminous plant?
A)
Ethylene done
clear
B)
ABA done
clear
C)
IAA done
clear
D)
Morphactin done
clear
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question_answer75)
Primary precursor of I.A.A is:
A)
Phenylalanine done
clear
B)
Tyrosine done
clear
C)
Tryptophan done
clear
D)
Valine done
clear
View Solution play_arrow
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question_answer76)
Pineapple can be made to flower in off season by:
A)
Ethylene done
clear
B)
Zeatin done
clear
C)
Naphthalene Acetic Acid (NAA) done
clear
D)
Temperature done
clear
View Solution play_arrow
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question_answer77)
When a plant is not reproducing, most of the cytokinins are produced in its:
A)
Lateral buds done
clear
B)
Shoot apex done
clear
C)
Roots done
clear
D)
Leaves done
clear
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question_answer78)
Etiolated seedlings are produced by germinating seeds and keeping them in total darkness. Under which of the following conditions will plants kept in the dark-begin to synthesise chlorophyll?
A)
After being given a pulse of blue light. done
clear
B)
After being given a pulse of red light. done
clear
C)
After being given a pulse of red light followed by a pulse of far-red light. done
clear
D)
After being given a pulse of far-red light followed by a pulse of red light. done
clear
View Solution play_arrow