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Neet Botany Plant Growth And Movements Mcq
Quiz 10
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Q.1
Gibberrelin participate in which of the following process?
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a) Growth of internodes
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b) Removal of seed dormancy
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c) Developing seed less fruit
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d) All of the above
Explanation
Answer:(d)
Q.2
Movement of cilia in Drocera, depends on which factor ?
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a) Light
0%
b) Temperature
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c) Touch
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d) Osmosis
Explanation
Answer:(c)
Q.3
By which action a seed coat becomes permeable to water ... ...
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a) scarification
0%
b) stratification
0%
c) vernalization
0%
d) all of the above
Explanation
Scarification means the application of those methods by which the hard seed coat is ruptured or softened so that it becomes permeable to water, gases and the embryo can expand. There are two methods of scarification as mechanical scarification and chemical scarification. This helps in overcoming seed dormancy. Answer:(a)
Q.4
Which hormone is responsible for fruit ripening?
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a) ethylene
0%
b) auxin
0%
c) ethyl chloride
0%
d) cytokinin
Explanation
Ethylene is largely a growth inhibiting phytohomone but is also involved in some growth promotion activities. It has been established that ethylene is a fruit ripening hormone. Ethylene stimulates all the biochemical changes which take place at the time of fruit ripening. Answer:(a)
Q.5
ABA is involved in ... ...
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a) shoot elongation
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b) increased cell division
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c) dormancy of seeds
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d) root elongation
Explanation
Abscisic acid (ABA) is a growth inhibiting phytohormone. Abscisic acid is found in vascular plants, some mosses, some fungi and some green algae. If ABA is applied exogenously, seed germination is inhibited. It has been suggested that ABA inhibits the synthesis of some enzymes, for germination. These enzymes are synthesised under the direction of nucleic acids. A view has been expressed that the translation of a particular messenger RNA is inhibited by ABA and the result is that protein synthesis is blocked. Answer:(c)
Q.6
The closing and opening of the leaves of Mimosa pudica is due to ... ....
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a) seismonastic movement
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b) chemonastic movement
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c) thermonastic movement
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d) hydrotropic movement.
Explanation
Nastic movements occur in response to a stimulus. It is independent of its direction. They are shown by bifacial organs (leaves, sepals, petals) and are in response to diffused external stimulus. Answer:(a)
Q.7
Phytochrome becomes active in ....
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a) red light
0%
b) green light
0%
c) blue light
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d) none of these
Explanation
Phytochrome is a bright blue or bluish green pigment which was firstrst of all isolated from plasma membrane of alga Mougeotias. It is a photoreceptive pigment. Phytochrome has a light absorbing or light detecting portion (the chromophore) attached to small protein of about 1,24,000 daltons. It is involved in the perception of photoperiodic stimuli controlling flowering and other morphogenetic phenomenon in plants Answer:(d)
Q.8
A pigment which absorbs red and far-red light is ... ....
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a) Cytochrome
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b) xanthophyll
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c) phytochrome
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d) carotene.
Explanation
Phytochrome is a bright blue or bluish green pigment which was rst of all isolated from plasma membrane of alga Mougeotias. It is a photoreceptive pigment. Phytochrome has a light absorbing or light detecting portion (the chromophore) attached to small protein of about 1,24,000 daltons. It is involved in the perception of photoperiodic stimuli controlling flowering and other morphogenetic phenomenon in plants Answer:(c)
Q.9
The twining of tendrils around a support is a good example of
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a) phototropism
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b) chemotropism
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c) nastic movements
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d) thigmotropism.
Explanation
Thigmotropism involves nastic movements resulting from touch. It occurs in tendrils which coil around support and help the plant in climbing. Phototropism is a paratonic movement in response to unidirectional light stimulus. Chemotropism is a directional paratonic movement that occurs in response to a chemical stimulus. Answer:(d)
Q.10
If the growing plant is decapitated, then .... ....
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a) its growth stops
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b) leaves become yellow and fall down
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c) axillary buds are inactivated
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d) axillary buds are activated
Explanation
Decapitating a growing plant means removing shoot apex of the plant. Auxin, a growth promoting phytohormone present in apex inhibits the growth of axillary buds so that only the apex continues to grow. When the apex containing auxin is removed or decapitation is done, then axillary buds show their growth, this is because the apical dominance is removed. This practice of removal of apical dominance is applied in tea gardens, hedges, rose gardens etc. Answer:(d)
Q.11
Which is produced during water stress that brings stomatal closure?
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a) ethylene
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b) abscisic acid
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c) ferulic acid
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d) coumarin
Explanation
Abscisic acid is produced during water stress that brings stomatal closure. Abscisic acid is a stress hormone and it is produced during water scarcity, when the transpiration rate exceeds absorption, the plant faces water stress condition. As a result, incipient wilting occurs. Under water stress condition ABA increases which induces stomatal closure. Answer:(b)
Q.12
Flowering dependent on cold treatment is ......
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a) cryotherapy
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b) cryogenics
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c) cryoscopy
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d) vernalisation
Explanation
In several plants, particularly bienniales and perennials, light does not seem to be the only factor controlling the process of flowering. Temperature, particularly the low temperature treatment induce floowering. Vernalization means ability of low temperature to convert winter cereal into spring cereal as a result of satisfaction of their low temperature requirement Answer:(d)
Q.13
Twining of tendrils is due to ... ....
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a) thigmotropism
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b) seismonasty
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c) heliotropism
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d) diageotropism
Explanation
Thigmotropism involves nastic movements resulting from touch. It occurs in tendrils which coil around support and help the plant in climbing. Thigmonasty or seismonasty is the nastic response of a plant or fungus to touch or vibration. Thigmonasty is a form of nastic movement whereas thigmotropism is a directional movement response. An example of thigmotropism is the coiling of tendrils or twiners upon contact to objects for support. In thigmonasty, an example is the shutting of a venus fly trap. Heliotropism, a form of tropism, is the diurnal motion or seasonal motion of plant parts in response to the direction of the sun. Phototropism is a paratonic movement in response to unidirectional light stimulus. Diageotropism is tropistic tendency of growing organs (such as branches, rhizomes, or roots) to assume a position with the axis at right angles with the line of gravity Answer:(a)
Q.14
Phytohormones are ... ...
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a) chemical regulation flowering
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b) chemical regulation secondary growth
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c) hormones regulating growth from seed to adulthood
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d) regulators synthesised by plants and influencing physiological processes.
Explanation
Growth hormones or phytohormones are defined as organic substances which are synthesized in minute quantities in one part of the plant body and transported to another part where they influence specific physiological processes. Phytohormones are chemical substances which are synthesized by plants and are naturally occurring. Answer:(d)
Q.15
Mowing grass lawn facilities better maintenance because ....
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a) wounding stimulates regeneration
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b) removal of apical dominance and stimulation of intercalary meristem
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c) removal of apical dominance
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d) removal of apical dominance and promotion of lateral meristem.
Explanation
Mowing grass lawn facilities better maintenance because of removal of apical dominance and stimulation of intercalary meristem. Answer:(b)
Q.16
Which one increases in the absence of light?
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a) uptake of minerals
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b) uptake of water
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c) elongation of intemodes
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d) ascent of sap.
Explanation
Stem elongation takes place in the absence of light due to etiolation. But uptake of minerals, uptake of water and ascent of sap all this process are related to photosynthesis which takes place only in the presence of light. Answer:(c)
Q.17
Bioassay for auxin is ... ... [ MPPMT 1999 ]
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a) Dwarf maize test
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b) Avena curvature test
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c) Cell division test
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d) Green leaf test
Explanation
Auxin bioassay is quantitative test as it measures concentration of auxin to produce the effect and the amount of effect. Two types of test are Avena Curvature Test and Root Growth Inhibition Answer : (b)
Q.18
Apical dominance is caused by ... ... [ CEBSE 1992]
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a) Abscisic acid in lateral bud
0%
b) Cytokinin in leaf tip
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c) Gibberellin in lateral buds
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d) Auxin in shoot tip
Explanation
Apical dominance is thought to be caused by the apical bud producing IAA (auxin) in abundance. This auxin is transported basipetally from the apical bud. The auxin causes the lateral buds to remain dormant. Answer : (d)
Q.19
What is the site of perception of photoperiod necessary for induction of flowering in plants? [NEET 2019]
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a) Lateral buds
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b) Pulvinus
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c) Shoot apex
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d) Leaves
Explanation
During flowering, photoperiodic stimulus is perceived by leaves of plants Answer : (d)
Q.20
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 cytokinesis. (iv) IAA acts antagonistic to GA. (v) Gibberellins delay senescence of fruits.
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a) 1
0%
b) 2
0%
c) 3
0%
d) 4
Explanation
Answer : (c)
Q.21
One of these is herbicide ... .... [ Manipal 2005]
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a) IAA
0%
b) NAA
0%
c) GA3
0%
d) 2,4-D
Explanation
2,4-Dichlorophenoxyacetic acid (usually called 2,4-D) is an organic compound with the chemical formula C8H6C12O3. It is a systemic herbicide which selectively kills most broadleaf weeds by causing uncontrolled growth in them, but leaves most grasses such as cereals, lawn turf, and grassland relatively unaffected. IAA (Indole-3-Acetic Acid) is the abundant and well known plant hormone of the auxin class. IAA is predominantly produced in the apical bud of and young leaves of plants and is known to be an inducer of cell division and elongation NAA is a synthetic plant hormone in the auxin family Gibberellins (GAs) are plant hormones that regulate various developmental processes Answer : (d)
Q.22
Leaf fall occurs when content of ... .. [ AIIMS 1990 ]
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a) Abscisic acid decreases
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b) Auxin decreases
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c) Auxin increases
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d) Gibberellin decreases
Explanation
Auxin also plays a role in the abscission of leaves and fruits. Young leaves and fruits produce auxin and so long as they do so, they remain attached to the stem. When the level of auxin declines, a special layer of cells — the abscission layer — forms at the base of the petiole or fruit stalk. Soon the petiole or fruit stalk breaks free at this point and the leaf or fruit falls to the ground. Answer : (b)
Q.23
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 (iii) It is a process of shortening of the reproductive phase. (iv) In vernalization by cold treatment, winter varieties can be transformed into spring or autumn varieties.
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a) (i), (ii) and (iii).
0%
b) (i) and (iii).
0%
c) (ii) (iii) and (iv)
0%
d) (i), (iii) and (iv)
Explanation
Answer : (d)
Q.24
ead 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) Ethylene promotes root growth and shoot hair formation. Of the above statements:
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a) (i), (ii) and (iii) are correct.
0%
b) (iii) and (iv) are correct
0%
c) (ii), (iii) and (iv) are correct
0%
d) (ii) and (iii) are correct
Explanation
Answer : (a)
Q.25
One hormone promotes abscission of flowers while the other delay senescence of fruits. These are respectively:
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a) Auxin and Cytokinin.
0%
b) Ethylene and Abscisic acid
0%
c) Abscisic acid and Ethylene
0%
d) Ethylene and Gibberellic acid
Explanation
Answer : (d)
Q.26
Flowering in short day plants is induced by:
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a) Short days and interrupted long nights
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b) Short days and uninterrupted long nights
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c) Long days and interrupted short nights
0%
d) Long days and uninterrupted short nights
Explanation
Answer : (b)
Q.27
Geometrical growth rate is expressed mathematically as W1 = W0ert, where (i) W1 = final size. (ii) W0 = initial size. (iii) r = growth rate. (iv) t = time of growth. (v) e = exponential growth. How many of the above are correct:
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a) 5
0%
b) 3
0%
c) 2
0%
d) 4
Explanation
Exponential growth is a specific way that a quantity may increase over time. It is expressed as power of some variable or constant given equation is exponantial equation, and 'e' is constant its value approximately equals to 2.71828. Therefore statement (v) is not correct and remaing four statemnts are correct Answer : (d)
Q.28
Arithmetic growth curve is linear because:
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a) One daughter cell remains meristematic and others differentiates and mature
0%
b) Both daughter cells remains meristematic.
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c) Both daughter cells get matured
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d) None of the above
Explanation
Answer : (a)
Q.29
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 concentration. (ii) Hormone (b) helps in increasing the size of apple. (iii) Hormone (c) helps in initiation of senescence and bud dormancy.
0%
a) a-auxin, b-Gibberellin, c-Ethylene
0%
b)a-Cytokinin, b-Zeatin, c-ABA.
0%
c) a-IAA, b-Ethylene, c-Cytokinin.
0%
d) a-Ethylene, b-Gibberellin, c-ABA.
Explanation
Answer : (c)
Q.30
The figure below shows growth of two leaves in one week. Select the correct option, if RGR = relative growth rate and AGR = Absolute growth rate.
0%
a) RGR of A = 5%, AGR of A = 100%, RGR of B= 5%, AGR of B = 100%
0%
b) RGR of A = 50%, AGR of A = 5%, RGR of B= 50%, AGR of B = 5%.
0%
c) RGR of A = 10%, AGR of A = 5%, RGR of B= 100%, AGR of B = 5%.
0%
d) RGR of A = 100%, AGR of A = 5%, RGR of B= 10%, AGR of B = 5%
Explanation
Answer : (d)
Q.31
The figure represents which type of growth:
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a) Arithmetic.
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b)Geometric.
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c) Linear
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d) Hyperbolic
Explanation
Answer : (c)
Q.32
In which category will you place this flower?
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a) SDP
0%
b) LDP
0%
c) DNP
0%
d) L-SDP.
Explanation
Answer : (a)
Q.33
In geometrical growth (from beginning to last), the correct sequence of growth phases and their occurrence are:
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a) Log phase → Lag phase → Asymptote.
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b) Asymptote → Log phase → Lag phase
0%
c) Lag phase → Exponential phase → Asymptote
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d) Lag phase → Exponential phase → Log phase.
Explanation
Answer : (c)
Q.34
Rate of growth stops and plants die at a temperature of
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a) 20-30°C
0%
b) 10-20°C
0%
c) 35-40°C
0%
d) 5-10°C
Explanation
Answer : (c)
Q.35
Effect of auxin diffusing from apical bud on lateral shoots is known as
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a) promoting effect
0%
b) compensatory effect
0%
c) inhibitory effect
0%
d) supporting effect
Explanation
Answer : (c)
Q.36
All of the following are plant growth inhibitors except;
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a) ABA
0%
b) Dormin
0%
c) Ethylene
0%
d) IAA
Explanation
Answer : (d)
Q.37
The changes that tracheary elements undergo to conduct water to long distances;
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a) Lose protoplasm.
0%
b) Develop very strong lignocellulosic secondary walls
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c) Develops very strong lignocellulosic primary walls
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d) Both A and B.
Explanation
Answer : (d)
Q.38
What is the maximum period of growth:
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a) Slow growth rate
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b) Steady growth rate
0%
c) Speedy growth rate
0%
d) Senescence
Explanation
Answer : (c)
Q.39
In some plants, the leaves of juvenile plant are different in shape from those in mature plants. This is the Heterophylly due to phase of life and seen in:
0%
a) Cotton, coriander, buttercup
0%
b) Butter cup and larkspur.
0%
c) Buttercup only
0%
d) Cotton, coriander, larkspur
Explanation
Answer : (d)
Q.40
he PGRs can be broadly classified into two groups based on their functions in living plant body. One group of PGRs are involved in growth promoting activities, such as cell division, cell enlargement, pattern formation, tropic growth flowering, fruiting and seed formation. These are also called:
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a) Plant growth regulators
0%
b) Plant growth promoters
0%
c) Plant growth inhibitors
0%
d) Plant growth supporters
Explanation
Answer : (b)
Q.41
If requisite period of low temperature treatment is followed by a period of high temperature, the expected acceleration of flowering did not occur. This process is known as:
0%
a) Photophosphorylation
0%
b) Dedifferentiation
0%
c) Devernalization
0%
d) Vernalization
Explanation
Answer : (c)
Q.42
Consider the following statements: (i) In climacteric fruits, ethylene production is high. (ii) Gibberellin is present in a healthy stem causes some of the new cells to differentiate as phloem. (iii) Loss of turgor in guard cell indicates the formation of Abscisic acid. Which of the following statements given above are correct?
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a) (i) and (ii) only.
0%
b) (ii) and (iii) only
0%
c) (i) and (iii) only
0%
d) (i), (ii) and (iii)
Explanation
Answer : (c)
Q.43
Match the list I with list II and select the correct answer using the codes given below:
List I
List II
a) Increase in wall elongation
Gibberellins
b) Bolting and flowering
Auxins
c) Phloem transport
Abscisic acid
d) Stoppage of cambium activity
Cytokinin.
0%
a) a → 2 , b →1 , c →3 , d →4
0%
b) a → 2 , b →1 , c →4 , d →3
0%
c) a → 1 , b →2 , c →4 , d →3
0%
d) a → 1 , b → 2 , c →3 , d →4
Explanation
Answer : (b)
Q.44
One set of a plant was grown at 8 hours day and 16 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?
0%
a) Darkness neutral
0%
b) Day neutral
0%
c) Short day
0%
d) Long day
Explanation
Answer : (c)
Q.45
Study the statements (i) – (iv) given below and select the two correct ones out of them: (i) Mathematical expression of geometric growth rate is W1 = W0ert. (ii) Photoperiodism does not affect reproduction in plants. (iii) Mathematical expression of arithmetic growth is Lt = L0 + L1 – rt. (iv) The cells of meristematic region is rich in protoplasm, possess large nucleus and having lignocellulosic cell wall. The two correct statements are:
0%
a) (ii) and (iii).
0%
b) (i) and (iv)
0%
c) (iii) and (iv)
0%
d) (i) and (ii)
Explanation
Answer : (b)
Q.46
hat causes a green plant exposed to the light on only one side, to bend towards the source of light as it grows?
0%
a) Green plants seek light because they are phototropic
0%
b) Light stimulates plant cells on the lighted side to grow faster
0%
c) Auxin accumulates on the shaded side, stimulating greater cell elongation there
0%
d) Green plants need light to perform photosynthesis
Explanation
Answer : (c)
Q.47
You are given a tissue with its potential for the differentiation in an) artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
0%
a) IAA and Gibberellin
0%
b) Auxin and Cytokinin
0%
c) Auxin and Abscisic acid
0%
d) Gibberellin and Abscisic acid
Explanation
Answer : (b)
Q.48
Dr. F.W Went noticed 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?
0%
a) It demonstrated the polar movement of auxin.
0%
b) It made possible the isolation and exact identification of auxin
0%
c) It is the basis for quantitative determination of small amount of growth promoting substances
0%
d) It supports the hypothesis that IAA is auxin
Explanation
Answer : (b)
Q.49
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 will terms will you use to describe them?
0%
a) Defoliated
0%
b) Mutated
0%
c) Embolised
0%
d) Etiolated
Explanation
Answer : (d)
Q.50
The avena curvature test is used for bioassay of:
0%
a) GA3
0%
b) IAA
0%
c) Ethylene
0%
d) ABA
Explanation
Answer : (b)
0 h : 0 m : 1 s
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