15 PLANT GROWTH AND DEVELOPMENT QUESTIONS
PLANT GROWTH AND DEVELOPMENT QUESTIONS
Development is
A) Growth
B) Differentiation
C) Growth + differentiation
D) Growth – differentiation
Growth of living being is/are-
A) Irreversible
B) Increase in size
C) Increase in weight
D) All of these
Swelling of piece of wood when placed in water is
A) Growth but not development
B) Development but not growth
C) No growth and development
D) Both growth & development
Plant grows
A) For a limited time in life
B) For a very long time in life
C) For a very short time in a life
D) For unlimited time throughout life
The given figure shows-
A) Germination & development in bean
B) Germination & development in maize
C) Germination & development in pea
D) Germination & development in gram
Plant grows throughout the life due to-
A) Meristematic tissue
B) Parenchyma tissue
C) Epidermal tissue
D) More than one option is correct
Open form of growth involves
A) Continuous division in all cells forming new set of cells which divide further necessarily.
B) Division in some cells forming new set of cells which do not divide further necessarily
C) No division at all
D) Division in some cells at the time of injury which forms new set of cells to heal the injury
Secondary growth does occur in-
A) All angiosperms and no gymnosperms
B) Some angiosperm and gymnosperms
C) No angiosperm and only gymnosperms
D) All angiosperm and all gymnosperms
Secondary growth does not mean-
A) Increase in length of plant
B) Increase in girth of plant
C) Increase in diameter in plant
D) Both A & C
Choose the correct label-
| (i) | (ii) | (iii) |
| A) Shoot apical meristem | Root apical meristem | Vascular cambium |
| B) Root apical meristem | Shoot apical meristem
|
Vascular cambium |
| C) Shoot parenchyma | Root parenchyma | Vascular bundle |
| D) Root parenchyma | Shoot parenchyma | Vascular bundle |
Growth can be measured by measuring increase in –
A) Amount of protoplasm
B) Dry weight
C) Cell number
D) Both B & C
Match the column in respect with the measurement growth-
Column I Column II
a Maize i Length
b Watermelon ii Surface area
c Pollen tube iii Cell number
d Dorsiventral leaf iv Cell size
A) a-iii, b-iv, c-i, d-ii
B) a-iii, b-ii, c-i, d-iv
C) a-iv, b-iii, c-i, d-ii
D) a-i, b-ii, c-iv, d-iii
The three phases of growth in correct order is-
A) Meristematic, maturation, elongation
B) Elongation, meristematic, maturation
C) Meristematic, elongation, maturation
D) Elongation, maturation, meristematic
Cells in meristematic phase of growth-
A) Have small nuclei
B) Have low plasmodesmatal connections
C) Have thick cell wall
D) Are rich in protoplasm
The phase of maturation lies-
A) Proximal to cells undergoing elongation, towards the tip
B) Proximal to cells undergoing elongation, away from the tip
C) Proximal to cells of meristematic zone, away from the tip
D) Proximal to cells of meristematic zone, towards the tip
Increased vacuolation is a characteristics of –
A) Meristematic phase
B) Maturation phase
C) Elongation phase
D) All of these
Thickest cell wall present in –
A) Meristematic phase
B) Maturation phase
C) Elongation phase
D) Both B & C
Increased growth per unit time is called
A) Growth index
B) Growth rate
C) Growth efficiency index
D) Both A & C
Identify the given figure
A) Figure shows geometric growth with formula Lt = Lo + rt
B) Figure shows geometric growth with formula W1 = Wo ert
C) Figure shows arithematic growth with formula Lt = Lo + rt
D) Figure shows arithematic growth with formula W1 = Wo ert
Identify the given figures
A) Figure shows geometric growth with formula Lt = Lo + rt
B) Figure shows geometric growth with formula W1 = Wo ert
C) Figure shows arithematic growth with formula Lt = Lo + rt
D) Figure shows arithematic growth with formula W1 = Wo ert
Choose the correct option with respect to given figures of stages of embryo development
A) (i) is arithmetic growth phase
B) (i) is geometric growth phase
C) (ii) is arithmetic growth phase
D) (ii) is geometric growth phase
Choose the correct set of option for size or weight of organ against time
(i) W1 = Wo ert (ii) Lt = Lo + rt
(iii) Linear growth curve (iv) Sigmoid growth curve
(v) Arithmetic growth (vi) Geometric growth
A) (i), (iii), (iv)
B) (ii), (iii), (vi)
C) (i), (iv), (vi)
D) (ii), (iv), (v)
The three phases of sigmoid growth occur in order are –
A) Log, lag, stationary
B) Log, stationary, lag
C) Lag, log, stationary
D) Lag, stationary, log
In the formula W1 = Wo ert , r is –
A) Relative growth rate
B) Efficiency index
C) Ability of plant to produce new plant material
D) All of these
choose the correct option –
A) Absolute growth rate of A is more than that of B
B) Absolute growth rate of B is more than that of A
C) Relative growth rate of A is more than that of B
D) Relative growth rate of B is more than that of A
The factors affecting growth can be –
A) Water, temperature, light, gravity
B) Water, temperature, light but not gravity
C) Water, light but not temperature & gravity
D) Water, light, gravity but not temperature
During differentiation
A) Structural changes occur in nucleus and cytoplasm
B) Functional changes occur in nucleus and cytoplasm
C) Structural changes occur in cell wall and protoplasm
D) All of these
Dedifferentiation can be seen in formation of–
A) Intrafascicular parenchyma
B) Intrafascicular cambium only
C) Interfascicular cambium only
D) Entire vascular cambium
Read the following statements –
(i) Cork cambium is a layer of meristem formed from parenchyma cells
(ii) Intrafascicular cambium is a layer of parenchyma cells formed from meristem
(iii) Vascular cambium divide and produce cells that differentiate again
(iv) Plant growth can be determinate or indeterminate
(v) Final structure of cells are never determined by location of cells
(vi) The differentiation in plant cells are closed and dependent on position
How many of the above statements are correct?
A) 3
B) 4
C) 5
D) 6
identify the correct labels –
A) (i)-Expansion, (ii)-Plasmatic growth, (iii)-Maturation
B) (ii)-Elongation, (i)-Plasmatic growth, (iii)-Maturation
C) (iii)- Elongation, (ii)-Plasmatic growth, (i)-Maturation
D) (iii)-Expansion, (i)-Plasmatic growth, (ii)-Maturation
Plasticity can be seen in –
A) Cotton
B) Coriander
C) Buttercup
D) All of these
Environmental heterophylly can be seen in
A) Larkspur
B) Cotton
C) Coriander
D) Buttercup
The given figure show –
A) Developmental heterophylly in buttercups
B) Environmental heterophylly in larkspur
C) Environmental heterophylly in buttercup
D) Developmental heterophylly in Larkspur
The figure shows sequence of the development process in
A) A plant cell
B) Plant tissue
C) Plant organs
D) All of these
The given figure show –
A) Developmental heterophylly in buttercups
B) Environmental heterophylly in larkspur
C) Environmental heterophylly in buttercup
D) Developmental heterophylly in larkspur
Intrinsic factors responsible for growth & development include –
A) Intracellular (plant growth regulators)
B) Intercellular (genetic)
C) Intercellular (plant growth regulators)
D) More than one option is correct
PGRs are –
A) Small, simple, molecules of diverse chemical composition
B) Large, simple molecules of diverse chemical composition
C) Small, complex molecules of diverse chemical composition
D) Large, complex molecules of diverse chemical composition
An example of adenine derivative PGR
A) IAA
B) Kinetin
C) ABA
D) Gibberellic acid
Gibberellic acid is –
A) Indole compound
B) Adenine compound
C) Carotenoid derivative
D) Terpene derivative
Abscisic acid is –
A) Indole compound
B) Adenine compound
C) Carotenoid derivative
D) Terpene derivative
Kinetin is –
A) Indole compound
B) Adenine compound
C) Carotenoid derivative
D) Terpene derivative
A gaseous PGR is
A) ABA
B) Ethylene
C) GA3
D) IAA
The PGRs that play important role in plant responses to wounds are –
A) Auxin
B) Cytokinin
C) Gibberellin
D) Abscisic acid
PGR Ethylene can fit into –
A) Group of plant growth promoters
B) Group of plant growth inhibitors
C) Both the groups of promoter & inhibitors but mostly inhibitor
D) Both the groups of promoter and inhibitors but mostly promoter
Discovery of how many out of 5 major PGRs was accidental?
A) 2
B) 1
C) 3
D) 5
Match the scientist with the plant they worked on –
Column I Column II
a F.W.Went i) Canary grass
b E. Kurosawa ii) Avena(oat)
c Charles & Francis Darwin iii) Tobacco
d F.S koog iv) Rice
A) a-iv, b-ii, c-iii, d-I
B) a-iii, b-i, c-ii, d-iv
C) a-ii, b-iv, c-i, d-iii
D) a-i, b-iii, c-iv, d-ii
Cousins confirmed the release of a volatile substance _(i)_, from ripened _(ii)_ that hastened the ripening of stored unripe_(iii)_.
A) (i)-ABA, (ii)-banana, (iii)-orange
B) (i)-ABA, (ii)-orange, (iii)-banana
C) (i)-C2H4, (ii)-banana, (iii)-orange
D) (i)- C2H4, (ii)- orange, (iii)-banana
Match the PGR with the plants which played role in their discovery –
Column I Column II
a Auxin i) Tobacco
b Gibberellin ii) Rice
c Cytokinin iii) Orange
d Ethylene iv) Avena
A) a-iii, b-i, c-ii, d-iv
B) a-iv, b-ii, c-i, d-iii
C) a-i, b-iii, c-iv, d-ii
D) a-ii, b-iv, c-iii, d-i
Abscisic acid was independent discovered by three different researchers and named as –
A) Inhibitor-A, abscission-III, dormin
B) Inhibitor-C, abscission-II, dormane
C) Inhibitor-B, abscission-II, dormin
D) Inhibitor-B, abscission-II, dormane
The term kinetin was given by –
A) Muller et al
B) Kurosawa et al
C) Cousins et al
D) None of these
The foolish seedling disease of rice is caused by –
A) Nematode
B) Bacteria
C) Fungus
D) Virus
Auxin was isolated by _(i)_ from _(ii)_
(i) |
(ii) |
| A) Francis Darwin | Wleoptile of oat seedling |
| B) Francis Darwin | Cleoptile of canary grass |
| C) F.W. Went | Cleoptile of oat seedling |
| D) F.W. Went
|
Cleoptile of canary grass |
The figure shows –
A) Experiment to show that tip of coleoptile produces gibberelin
B) Experiment to show that tip of coleorhiza produces gibberelin
C) Experiment to show that tip of coleorhiza produces auxin
D) Experiment to show that tip of coleoptile produces auxin
Auxin was first isolated from –
A) Xylem sap
B) Phloem sap
C) Human urine
D) Root exudates
Synthetic auxins –
A) IAA
B) IBA
C) NAA
D) Both A & C
Auxin isolated from plant –
A) NAA
B) IAA
C) 2, 4-D
D) Both A & B
Auxins are generally produced by –
A) Growing apex of root & shoot
B) Epidermal tissue of shoots only
C) Xylem secondary cells
D) Endodermal cells of roots & shoot
Assertion: Auxin is used in plant propagation widely.
Reason: Auxin initiate rooting.
Choose the correct option –
A) Both Assertion and Reason are correct, and Reason is correct explanation of Assertion
B) Both Assertion and Reason are correct, but Reason doesn’t explain Assertion
C) Assertion is correct but Reason is wrong
D) Both Assertion and Reason are incorrect
Auxin promote –
A) Rooting in stem cutting
B) Flowering in pineapple
C) Bolting in beet
D) Both A & B
Statement-I Auxin prevent fruit and leaf drop at early stage
Statement-II Auxin promote abscission of older mature leaves & fruits
Choose the appropriate option –
A) Statement-I is correct and Statement-II is incorrect
B) Statement-I is incorrect and Statement-II is correct
C) Both Statement-I & Statement-II are correct
D) Both Statement-I & Statement-II are incorrect
Auxin –
A) Promotes apical dominance
B) Prevent apical dominance
C) Both promote & prevent apical dominance based on condition
D) Can’t say
In tea plantation and hedge –making
A) Lateral buds are removed
B) Shoot tips are removed
C) Root tips are removed
D) None of these
Auxin –
A) Induces parthenocarpy
B) Act as herbicide
C) Help in cell division
D) All of these
2, 4-D is used to –
A) Kill gymnosperms usually
B) Kill dicot usually
C) Kill monocot usually
D) Both A & B
Gibberellins are
A) Promotory PGR
B) Inhibitory PGR
C) Neither promotory nor inhibitory PGR
D) Both promotory and inhibitory PGR
Which of the following statements are incorrect –
A) There are more than 100 gibberellins reported
B) GA3 was one of the gibberellins to be discovered
C) All GA are basic
D) GAs are also reported in fungi
Gibberellins is used in grapes for –
A) Increase in length of stalk
B) Increase in girth of stalk
C) Decrease in length of stalk
D) Decrease in girth of stalk
Gibberellins –
A) Promotes senescence
B) Delay senescence
C) Neither promote not delay senescence
D) Both promote & delay senescence based on situation
Assertion: Spraying gibberellins on fruits extend its market period
Reason: Gibberellins delays senescence
Choose the best option –
A) Both assertion & reason are correct and reason is correct explanation of assertion
B) Both assertion & reason are correct but reason is not explanation of assertion
C) Assertion is correct but reason is wrong
D) Both assertion & reason are in correct
Which of these are correct –
A) ABA shows the malting process in brewing industry
B) ABA speeds the malting process in brewing industry
C) GA3 slows the malting process in brewing industry
D) GA3 speeds the malting process in brewing industry
Gibberellins is used to improve yields of –
A) Apple
B) Grape
C) Sugarcane
D) All of these
Assertion: Juvenile conifers are sprayed with GA
Reason: GA delays senescence and malting period
Which of the given options are correct?
A) Both assertion & reason are correct and reason is correct explanation of assertion
B) Both assertion & reason are correct but reason is not explanation of assertion
C) Assertion is correct but reason is wrong
D) Both assertion & reason are in correct
Bolting is –
A) Yellowing of leaves
B) Node elongation prior to flowering
C) Early maturing and seed production
D) None of these
GA promote bolting in –
A) Beet
B) Cabbage
C) Plants with rosetle habit
D) All of these
Cytokinins were discovered as –
A) Kinin
B) Kinetin
C) Kinesin
D) Zentin
Kinetin is a modified form of –
A) Purine – guanine
B) Pyrimidine – cytosine
C) Purine – adenine
D) Pyrimidine – thymine
Kinetin was discovered from –
A) Autoclaved herring egg DNA
B) Human urine
C) Corn kernel
D) None of these
Read the following statements regarding cytokinin –
i) Kinetin occurs naturally in plants
ii) Kinetin was discovered from coconut milk
iii) Zeatin does not occur naturally in plants
iv) Zeatin was isolated from human DNA
How many of the statements are incorrect–
A) 1
B) 2
C) 3
D) 4
Natural cytokinin may be synthesized in –
A) Root apex
B) Developing shoot buds
C) Young fruits
D) More than one option is correct
Cytokinin helps to produce –
A) Chloroplast in leaves
B) Elongation in sugarcane
C) Synchronized fruit set in pineapple
D) Flowering in pineapple
Ethylene is synthesized in large amounts by –
A) ripening fruit
B) Tissues undergoing senescence
C) Newly developed leaves
D) More than one option is correct
Ethylene causes _(i)_ growth of seedling, swelling of axis and apical hook formation in _(ii)_ seedling
(i) (ii)
A) Horizontal Monocot
B) Vertical Dicot
C) Horizontal Dicot
D) Vertical Monocot
Ethylene promotes –
A) Senescence and abscission of flowers
B) Senescence but not abscission of flowers
C) Abscission of flowers but not senescence
D) Neither senescence nor abscission of flowers
Ethylene in fruits causes –
A) Rise in rate of respiration called respiratory anti-climactic
B) Rise in rate of respiration called respiratory climactic
C) Fall in rate of respiration called respiratory anti-climactic
D) Fall in rate of respiration called respiratory climactic
Ethylene –
A) Promotes seed and bud dormancy
B) Promotes only seed dormancy
C) Promotes only bud dormancy
D) None of these
Statement-I Ethylene promotes internode/petiole elongation in deep water rice plants
Statement-II ethylene helps upper part of shoot to remain above water.
Choose the appropriate option –
A) Statement-I is correct and Statement-II is incorrect
B) Statement-I is incorrect and Statement-II is correct
C) Statement-I and Statement-II are correct
D) Statement-I and Statement-II are incorrect
Ethylene –
A) Promotes root hair formation and increase in absorption surface
B) Demotes root hair formation and increase in absorption surface
C) Promotes root hair formation and decrease in absorption surface
D) Demotes root hair formation and decrease in absorption surface
Ethylene initiates –
A) Flowering in pineapple
B) Flowering in mango
C) Synchronizing fruit-set in pineapple
D) All of these
Most widely used source of ethylene –
A) Is ethepene
B) Hasters fruit ripening in tomato and apple
C) In aqueous solution is absorbed on the plant roots
D) More than one option is correct
Ethylene promotes –
A) Female flowers in cucumber, increasing the yield
B) Female flowers in cucumber, decreasing the yield
C) male flowers in cucumber, increasing the yield
D) male flowers in cucumber, decreasing the yield
ABA is –
A) Inhibitor of plant growth and metabolism
B) Inhibitor of plant growth but not metabolism
C) Inhibitor of plant metabolism but not growth
D) Inhibitor of neither plant growth nor metabolism
ABA –
A) Inhibit seed germination
B) Promote seed dormancy
C) Inhibit seed dormancy
D) Both A & B
ABA is called stress hormone because
A) It causes stress to plant
B) It is released during stress in plant
C) It helps plant to fight stress conditions
D) More than one option is correct
ABA stimulates –
A) Stomata opening for more CO2 exchange
B) Stomata closure to decrease transpiration
C) Stomata opening to cause transpiration & calling effect
D) Both A & C
In most situation, ABA acts as an antagonist to-
A) Auxin
B) GA
C) Cytokinin
D) Ethylene
Identify the correct labels –
(i) |
(ii) |
(iii) |
| A) Long day plant
|
Day neutral plant | Short day plant |
| B) Short day plant | Day neutral plant | Long day plant |
| C) Long day plant | Short day plant | Day neutral plant |
| D) Short day plant | Long day plant | Day neutral plant |
Read the given statements –
Statement-I Some plants require a periodic exposure to light to include flowering
Statement-II Some plants are able to measure the duration of exposure to light
Choose the correct statements –
A) Both statements are correct and are about photoperiodism
B) One of the statements is correct about photoperiodism
C) Both statements are correct and is about vernalization
D) One of the statements is correct about vernalization
For day neutral plants, there is
A) No correlation between light duration and flowering
B) Direct correlation between light duration and flowering
C) Indirect correlation between light duration and flowering
D) Direct correlation between light intensity and flowering
In photoperiodism –
A) Duration of light period matters only
B) Duration of dark period matters only
C) Duration of light and dark period matters
D) Duration of light or dark period doesn’t matter
Photoperiods are perceived by –
A) Shoot apices
B) Flowering apices
C) Nodal buds
D) Leaves
Vernalization is –
A) Quantitative dependence of flowering on low temperature
B) Qualitative dependence of flowering on low temperature
C) Quantitative dependence of flowering on high temperature
D) A and B are correct
Vernalization can be seen in –
A) Spring varieties of rice
B) Spring varieties of wheat
C) Winter varieties of rice
D) Winter varieties of wheat
Vernalization is also seen in –
A) Biennials like – sugarbeet
B) Biennials like maize
C) Perennials like sugarbeet
D) Perennials like maize
Some seeds which do not germinate even when external conditions are favorable, are understood to be going through –
A) Dormancy controlled by external environment
B) Dormancy controlled endogenously
C) Dormancy controlled by conditions within the seed
D) More than one option is correct
Chemical inhibitions of germination are –
A) Abscisic acid
B) Phenolic acid
C) Para-ascorbic acid
D) All of these
Germination may not occur due to –
i) Hard seed coat ii) Immature embryo
iii) Chemical inhibitors iv) Harsh environment
How many of above are correct?
A) 1
B) 2
C) 4
D) 3
Seed coat dormancy is broken by –
A) Mechanical abrasions
B) Microbial actions in gut of animals
C) Certain chemicals
D) More than one option is correct
Effects of inhibitory substances on dormancy is removed by application of certain chemicals are –
A) Auxin
B) Gibberellic acid
C) Cytokinin
D) ABA
Fruit and leaf drop at early stages can be prevented by the application of
(a) Ethylene
(b) Auxins
(c) Gibberellic acid
(d) Cytokinins
The Avena curvature is used for bioassay of
(a) ABA
(b) GA3
(c) IAA
(d) Ethylene
Typical growth curve in plants is
(a) Linear
(b) Stair-steps shaped
(c) Parabolic
(d) Sigmoid
What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?
(a) Green plants seek light because they are phototropic.
(b) Light stimulates plant cells on the lighted side to grow faster.
(c) Auxin accumulates on the shaded side, stimulating greater cell elongation there.
(d) Green plants need light to perform photosynthesis.
Auxin can be bioassayed by
(a) Hydroponics
(b) Potometer
(c) Lettuce hypocotyl elongation
(d) Avena coleoptile curvature
Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment?
(a) It made possible the isolation and exact identification of auxin.
(b) It is the basis for quantitative determination of small amounts of growth-promoting substances.
(c) It supports the hypothesis that IAA is auxin.
(d) It demonstrated polar movement of auxins.
A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white coloured like albinos. Which of the following terms will you use to describe them?
(a) Mutated
(b) Embolised
(c) Etiolated
(d) Defoliated
Which one of the following growth regulators is known as ‘stress hormone’?
(a) Abscissic acid
(b) Ethylene
(c) GA3
(d) Indole acetic acid
What is the site of perception of photoperiod necessary for induction of flowering in plants?
(1) Lateral buds
(2) Pulvinus
(3) Shoot apex
(4) Leaves
It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?
(1) Auxin and Ethylene
(2) Gibberellin and Cytokinin
(3) Gibberellin and Abscisic acid
(4) Cytokinin and Abscisic acid
Removal of shoot tips is a very useful technique to boost the production of tea-leaves. This is because:-
(1) Gibberellins prevent bolting and are inactivated
(2) Auxins prevent leaf drop at early stages
(3) Effect of auxins is removed and growth of lateral buds is enhanced.
(4) Gibberellins delay senescence of leaves.
In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed?
(1) Ethylene
(2) Auxins
(3) Gibberellins
(4) Cytokinins
Who coined the term ‘Kinetin’ ?
(1) Skoog and Miller
(2) Darwin
(3) Went
(4) Kurosawa
Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to:
(1) Gibberellic acid
(2) Nitrate
(3) Ascorbic acid
(4) Chilling conditions
Match the following concerning the activity/function and the phytohormone involved
(a) Fruit ripener (i) Abscisic acid
(b) Herbicide (ii) GA3
(c) Bolting agent (iii) 2, 4-D
(d) Stress hormone (iv) Ethephon
Select the correct option from following :-
(1) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
(2) (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
(3) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
(4) (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
Name the plant growth regulator which upon spraying on sugarcane crop, increase the length of stem, thus increasing the yield of sugarcane crop.
1) Abscisic acid
2) Cytokinin
3) Gibberellin
4) Ethylene
The process of growth is maximum during
1) Dormancy
2) Log phase
3) Lag phase
4) Senescence
Which of the following is not an inhibitory substance governing seed dormancy?
1) Para-ascorbic acid
2) Gibberellic acid
3) Abscisic acid
4) Phenolic acid
Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:
(1) Flexibility
2) Plasticity
3) Maturity
4) Elasticity
The plant hormone used to destroy weeds in a field is
1) NAA
2) 2, 4- D
3) IBA
4) IAA
The site of perception of light in plants during photoperiodism is:
1) Stem
2) Axillar bud
3) Leaf
4) Shoot apex
In the exponential growth equation , e represents
1) The base of exponential logarithms
2)The base of natural logarithms
3) The base of geometric logarithms
4)The base of number logarithms
The gaseous plant growth regulator is used in plants to:
1) Speed up the malting process
2) Promote root growth and root hair formation to increase the absorption surface
3) Help overcome apical dominance
4) Kill dicotyledonous weeds in the fields
Which one of the following plants does not show plasticity?
1) Cotton
2) Coriander
3) Buttercup
4) Maize