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Quiz 5
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Q.1
Which one prevents photo-oxidation and pigment destruction? ... ... [ AIIMS 1997]
0%
a) Phytochrome
0%
b) Phytochormone
0%
c) Phycocyanin
0%
d) Phco-erythrin
Explanation
Phytochrome plays a central role in this regulation of synthesis of RUBISCO, the chlorophyll a/b-binding protein, and many other chloroplast proteins. Answer : (a)
Q.2
Auxins promote ... .... [ JKCMEE 2004]
0%
a) Apical dominance
0%
b) Cambial activity
0%
c) Cell growth
0%
d) All the above
Explanation
PIN genes in the surrounding plant tissues promote cambium activity by increasing auxin concentration in cambium cells. PIN proteins are integral membrane proteins that transport the anionic form of the phytohormone auxin across membranes. Auxin inhibits the growth of lateral buds so that the plant may grow vertically,Apical dominance occurs Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Answer : (d)
Q.3
Cytokinins are mostly ... ... [ MPPMT 1996]
0%
a) Glucosides
0%
b) Aminopurine
0%
c) Acidic
0%
d) Phenolic
Explanation
A synthetic cytokinin , is 6-furfuryl aminopurine. Adenine-type cytokinins represented by kinetin, zeatin, and 6-benzylaminopurine Answer : (b)
Q.4
Seismonasty occurs in ... ...... [ JKCMEE 2010]
0%
a) Samanea saman
0%
b) Albizia lebbeck
0%
c) Hibiscus rosa- sinensis
0%
d) Mimosa pudica
Explanation
Thigmonasty or seismonasty is the nastic response of a plant or fungus to touch or vibration. Conspicuous examples of thigmonasty include many species in the leguminous subfamily Mimosoideae, active carnivorous plants such as Dionaea and a wide range of pollination mechanisms. Answer : (d)
Q.5
Which one can induce flowering in long day plants? ... ... [ MPPMT 1992]
0%
a) IBA
0%
b) IAA
0%
c) GA3
0%
d) NAA
Explanation
Gibberellins (GAs) promote bolting and flower formation in long-day (LD) and biennial plants under conditions that would not normally permit flowering contributed to the realization that these compounds may function as endogenous growth regulators Answer : (c)
Q.6
Cytokinin synthesis is maximum in .... ... [ DPMT 2001]
0%
a) Roots
0%
b) Leaves
0%
c) Shoot tip
0%
d) Fruit
Explanation
Most adenine-type cytokinins are synthesized in roots. Cambium and other actively dividing tissues also synthesize cytokinins. Answer : (a)
Q.7
Which plant hormone plays an important role in seed dormancy and germination respectively?
0%
a) Abscisic acid and Gibberellic acid
0%
b)Ethylene and Abscisic acid
0%
c) Ethylene and Gibberellic acid
0%
d) Gibberellic acid and Ethylene
Explanation
Answer : (a)
Q.8
Assertion: Phase of cell division is also known as formative phase Reason: In formative phase new cells are produced from pre-existing cells through meiosis ... ..... [ AIIMS 2007]
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Phase of cell division also known as formative phase. It is the first step for the growth of the multicellular organisms. Assertion statement is true In mitosis a cell divides to form two identical daughter cells. thus statement Reason is false statement. Answer : (c)
Q.9
Genetic dwarfness can be overcome by treating the plant with ... .... [ AIIMS 1996]
0%
a) Cytokinin
0%
b) Gibberellic acid
0%
c) Auxin
0%
d) Antigibberellin
Explanation
GA helps to overcome the genetic limitations in many dwarf varieties
Q.10
Avena curvature test is bioassay for activity of ... ..... [ AIIMS 2006]
0%
a) Auxin
0%
b) Ethylene
0%
c) Cytokinin
0%
d) Gibberellin
Explanation
The Avena geo-curvature test is a bioassay for auxin-type growth. regulators. Answer : (a)
Q.11
Bioassay of IAA is .... ... [ BHU 2005]
0%
a) Avena curvature test
0%
b) Callus test
0%
c) Leaf disc test
0%
d) α-amylase test
Explanation
The Avena geo-curvature test is a bioassay for auxin-type growth. regulators. Answer : (a)
Q.12
The sequence of various components of a growth curve are .... ... [ MHTCET 2009]
0%
a) Lag, log, stationary
0%
b) Log, lag, stationary
0%
c) Log, stationary, lag
0%
d) Stationary, log, lag
Explanation
The classic growth curve, as exemplified by a newly established bacterial colony, is divided into four phases, in order of their appearance: (1) lag phase; (2) log (logarithmic), or exponential, phase; (3) stationary phase; and (4) death, or decline, phase. Answer : (a)
Q.13
Morphactins are derivatives of ... ... [ Pb.PMT 2005]
0%
a) Fluorine carboxylic acid
0%
b) Fluoromalic acid
0%
c) Chlorofluorocarbons
0%
d) Methanogens
Explanation
Morphactins are a group of substances which act on morphogenesis and modulate the expression of plants. Chemically, they are the derivates of Fluorine carboxylic acid compounds. Morphactins are a novel group of synthetic plant growth regulators which modify growth and development. Answer : (a)
Q.14
Movement of pollen tube towards ovule is ... .. [ CPMT 2003]
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a) Chemotropism
0%
b) Haptotropism
0%
c) Thigmotropism
0%
d) Phototropism
Explanation
Movement of pollen tube towards ovule is Chemotropism Answer : (a)
Q.15
Which one is wrongly matched? ... ... [ kerala 2006]
0%
a) Auxins - to grow
0%
b) Gibberellins - Gibberella fujikuroi
0%
c) Cytokinins - Herring sperm DNA
0%
d) ABA - flowering hormone
Explanation
Abscisic acid (ABA) is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure. Florigen (or flowering hormone) is the hypothesized hormone-like molecule responsible for controlling and/or triggering flowering in plants. Thus opction "d" is not a correct match Answer : (d)
Q.16
Cut or excised leaves remain green for long if induced to root or dipped in ... ... [ AIIMS 1991]
0%
a) Gibberellins
0%
b) Cytokinins
0%
c) Auxins
0%
d) Ethylene
Explanation
Cytokinin are plant growth hormones which are basic in nature cytokinins induce formation of new leaves chloroplasts in leaves, which intum keeps the leaves green for a longer duration of time. Cytokinins applied to marketed vegetables can keep them fresh for several days. Shelf life of cut shoots and flowers is prolonged by employing the hormones. Answer : (b)
Q.17
Cryptochrome is ... ....[ Odisha 2006]
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a) Yellow light absorbing
0%
b) Pigment of cryptogams
0%
c) Red light absorbing pigment
0%
d) Blue-light absorbing pigment
Explanation
Cryptochromes are a class of flavoproteins that are sensitive to blue light. Answer : (d)
Q.18
Induction of cell division and delay in senescence are due to ... .. [ CPMT 2000 ]
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a) Gibberellin
0%
b) Auxin
0%
c) Cytokinin
0%
d) Ethylene
Explanation
Cytokinins (CK) are a class of plant growth substances (phytohormones) that promote cell division, or cytokinesis, in plant roots and shoots. Cytokinin production slows down the process of senescence. Answer : (c)
Q.19
The hormone responsible for apical dominance is .... ... [ CBSE 1991]
0%
a) IAA
0%
b) GA
0%
c) ABA
0%
d) Florigen
Explanation
IAA hormone is responsible for apical dominance Answer : (a)
Q.20
Exponential growth is expressed as .... .... [ kerala 2011]
0%
a) Lt = L0 + rt
0%
b) L0 = Lert
0%
c) W1 = W0ert
0%
d) W0 = W1 ert
Explanation
W1 = W0ert W1 = final size (weight, height, number etc.), W0 = initial size at the beginning of the period, r = growth rate, t = time of growth and e = base of natural logarithms. Answer : (c)
Q.21
Hormone involved in phototropism is ... ...[ EAMCET 1996]
0%
a) IAA
0%
b) Gibberellin
0%
c) Kinetin
0%
d) 2, 4-D
Explanation
IAA is the main auxin in plants, regulating growth and developmental processes such as cell division and elongation, tissue differentiation, apical dominance, and responses to light, gravity, and pathogens. Roots are most sensitive to fluctuations in IAA level. Answer : (a)
Q.22
Maximum of growth occurs in ... ... [ CPMT 1993]
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a) Exponential phase
0%
b) Decline phase
0%
c) Stationary phase
0%
d) Lag phase
Explanation
Following a period during which the growth rate of the cells gradually increases, the cells grow at a constant, maximum rate and this period is known as the log, or exponential, phase and the increase in biomass concentration will be proportional to the initial biomass concentration. Answer : (a)
Q.23
Growing trees and shrubs in small pots is .... .... [ AFMC 2002]
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a) Bonsai
0%
b) Culture
0%
c) Green gardening
0%
d) Tree culture
Explanation
Bonsai is a Japanese art form which utilizes cultivation techniques to produce, in containers, small trees that mimic the shape and scale of full size trees. Answer : (a)
Q.24
Agent orange is ... ... [ CBSE 1998]
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a) Weedicide with dioxin
0%
b) Chemical used in luminous paint
0%
c) Biodegradable insecticide
0%
d) Colour used in fluorescent lamp
Explanation
Agent Orange was one of a class of color-coded herbicides The two active ingredients in the Agent Orange herbicide combination were equal amounts of 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), which contained traces of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) Answer : (a)
Q.25
Sleep movements in Samanea saman are regulated by ... .... [ EAMCET 2002]
0%
a) N
0%
b) P
0%
c) K
0%
d) Mg
Explanation
Nyctinasty is the circadian rhythmic nastic movement of higher plants in response to the onset of darkness, or a plant "sleeping". such nastic movement is caused due to pulvinar movements Pulvinar movement is caused by changes in turgor pressure leading to a contraction or expansion of the parenchyma tissue. Sucrose is unloaded from the phloem into the apoplast which decreases the water potential and triggers the efflux of potassium ions from the surrounding cells. This is followed by an efflux of water, resulting in a sudden change of turgor pressure in the cells of the pulvinus. Aquaporins on the vacuole membrane of pulvini allow for the efflux of water that contributes to the change in turgor pressure. causing nastic movement Answer : (c)
Q.26
Flowering depended on cold treatment is ... ... [ BHU 1995]
0%
a) Cryotherapy
0%
b) Cryogenics
0%
c) Cryoscopy
0%
d) Vernalisation
Explanation
Vernalization is the induction of a plant's flowering process by exposure to the prolonged cold of winter, Answer : (d)
Q.27
Which is not a function of cytokinin? ... ..... [ RPMT 2006]
0%
a) Delay is senescence
0%
b) Breaking seed dormancy
0%
c) Promoting bud dormancy
0%
d) Promoting stomatal opening
Explanation
Cytokinin transported into the buds to promote bud release Answer : (c)
Q.28
Natural cytokinins are synthesised in tissues that are ... ... [ DPMT 2011]
0%
a) Storing food
0%
b) Differentiating
0%
c) Dividing
0%
d) Senescent
Explanation
Most adenine-type cytokinins are synthesized in roots. Cambium and other actively dividing tissues also synthesize cytokinins. Answer : (c)
Q.29
Growth is maximum in zone of ... ... [ AFMC 1994]
0%
a) Cell elongation
0%
b) Cell division
0%
c) Cell maturation
0%
d) All the above
Explanation
Growth is estimated by an increase in cell number, area, volume, and length. The cell elongation rate clearly influences overall plant height since cell division is restricted to a small portion of the shoots and roots. Answer : (a)
Q.30
Which hormone is produced in most plant cells as product of metabolism ... ..... [ MHTCET 2011]
0%
a) Gibberellin
0%
b) Cytokinin
0%
c) Auxin
0%
d) Ethylene
Explanation
Ethylene is biosynthesized from the amino acid methionine Answer : (d)
Q.31
Which one demonstrates process associated with abscission of a leaf ... .... [ Guj CET 2010]
0%
a) In the leaf concentration of both auxin and ABA decreases
0%
b) In the leaf concentration of both auxin and ABA increases
0%
c) Reduction in ABA concentration and increase of auxin concentration in the leaf
0%
d) Reduction in concentration of auxin and increase of concentration of ABA in the leaf
Explanation
During the process associated with abscission of a leaf free IAA decrease concentration and ABA levels increase considerably when plants wilt Answer : (d)
Q.32
Geotropic response of roots is due to ... .... [ MPPMT 1992]
0%
a) Inhibition of stem growth
0%
b) More growth on lower side
0%
c) More growth on upper side
0%
d) Uniform growth
Explanation
Geotropism is a coordinated process of differential growth by a plant or fungus in response to gravity pulling on it Answer : (c)
Q.33
Auxin takes part in ... ... [ BHU 1996]
0%
a) Promotion of cell division
0%
b) Promotion of cell enlargement
0%
c) Promotion of fruit ripening
0%
d) Inhibition of shoot growth
Explanation
Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Answer : (b)
Q.34
Which of the following is a long day plant ... .... [ Guj. CET 2006]
0%
a) Poppy
0%
b) Santhium
0%
c) Paddy
0%
d) Soybean
Explanation
Opium poppy, Papaver somniferum L., is a long-day plant with a critical daylength for flowering of 14 to 16 hours. Answer : (a)
Q.35
IAA helps in formation of ... ... [ RPMT 2005]
0%
a) Stem
0%
b) Root
0%
c) Fruit
0%
d) Lateral buds
Explanation
Auxins are responsible for cell elongation and enlargement in the stems of plants. They stimulate bud formation, root initiation, and seed protein synthesis. In tandem with cytokinins, they promote cell division in various tissues. Answer : (b)
Q.36
Bud dormancy is induced by .... ... [ AIIMS 2002]
0%
a) IAA
0%
b) GA
0%
c) ABA
0%
d) Ethylene
Explanation
Bud dormancy is a suspension of most physiological activity and growth that can be reactivated Answer : (c)
Q.37
Seasonality of Plants is due to .... ..... [ MPPMT 1997]
0%
a) Phototropism
0%
b) Photosynthesis
0%
c) Photoperiodism
0%
d) Photolysis
Explanation
Abscisic acid (ABA) is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure. Answer : (c)
Q.38
Hormone that breaks dormancy of seeds/potato tuber is ......[ CBSE 2001]
0%
a) IAA
0%
b) ABA
0%
c) Zeatin
0%
d) Gibberellin
Explanation
Gibberellins (GAs) are plant hormones that are essential for many developmental processes in plants, including seed germination, stem elongation, leaf expansion, trichome development, pollen maturation and the induction of flowering Answer : (d)
Q.39
Auxin causes cells to absorb water from hypertonic medium because ... ... [ Manipal 2005]
0%
a) It lowers transpiration rate
0%
b) It raises rate of cellular respiration for providing ATP for active water absorption
0%
c) It increases solute potential of cells
0%
d) It increases rate of transpiration
Explanation
Auxin is able to bring about the absorption of water, thus restoring turgidity and inducing cell enlargement. In the guard cells, the action of H+-ATPase activity is positively regulated by blue light and auxins, Activated H+-ATPases drive K+ uptake through the hyperpolarization-activated inwardly rectifying K+ (K+in) channels in the plasma membranes, and the resulting K+-salt accumulation in guard cells elicits stomatal opening Answer : (b)
Q.40
If a tree flowers thrice in a year in October, January and July in northern India, the plant is ... .... [ CBSE 1997]
0%
a) Photo- and theromo-sensitive
0%
b) Photo- and theromo-insensitive
0%
c) Photosensitive but therom-insensitive
0%
d) Thermo-sensitive but photo-insensitive
Explanation
Flowering of plant depends on temperature and light Since plant in question can give flowers in all season, plant must be Photo- and theromo-insensitive. Answer : (b)
Q.41
Study of phototropic lead to the discovery of .... .... [ AMU 2011]
0%
a) Cytokinin
0%
b) Ethylene
0%
c) Gibberellin
0%
d)
Explanation
Study of phototropic lead to the discovery of Auxin Answer : (d)
Q.42
Clinostat is the apparatus used to ... ... [ MPPMT 1990]
0%
a) Measure the rate of growth in plant
0%
b) Measure the quantity of auxin in plant
0%
c) Measure the effect of light on plant
0%
d) Eliminate the effect of gravity or geotropism on plant
Explanation
A clinostat is a device which uses rotation to negate the effects of gravitational pull on plant growth (gravitropism) and development (gravimorphism). Answer : (d)
Q.43
Who discovered photoperiodism? ... ..[ MPPMT 1994]
0%
a) Darwin
0%
b) Lysenko
0%
c) Arnon
0%
d) Garner and Allard
Explanation
The effect of photoperiods or daily duration of light hours (and dark periods) on the growth and development of plants, especially flowering, is called photoperiodism. Photoperiodism was first studied by Garner and Allard (1920). Answer : (d)
Q.44
Seed dormancy is induced by .... ..... [ WB 2008 ]
0%
a) ABA
0%
b) GA
0%
c) Thiourea
0%
d) Cytokinin
Explanation
ABA promotes seed dormancy and germination inhibition. Action of ABA is counteracted by GA, which promotes seed germination at appropriate time. Answer : (a)
Q.45
Gibberellins promote ... ... [ DPMT 2002]
0%
a) Seed dormancy
0%
b) Leaf fall
0%
c) Seed germination
0%
d) Root elongation
Explanation
Gibberellins (GAs) are a group of about 125 closely-related plant hormones that stimulate shoot elongation, seed germination, and fruit and flower maturation. Other effects of GAs include gender expression, seedless fruit development, and the delay of senescence in leaves and fruit Answer : (c)
Q.46
Photoperiodism is associated with .... .... [ CET Chd. 2006]
0%
a) Auxin
0%
b) Chlorophyll
0%
c) Florigen
0%
d) Gibberellin
Explanation
Florigen (or flowering hormone) is the hypothesized hormone-like molecule responsible for controlling and/or triggering flowering in plants. Florigen is produced in the leaves, and acts in the shoot apical meristem of buds and growing tips. It is known to be graft-transmissible, and even functions between species. Answer : (c)
Q.47
Which one is derivative of a carotenoid ... ..... [ CBSE 2009 ]
0%
a) IAA
0%
b) ABA
0%
c) IBA
0%
d) GA
Explanation
carotenoid a class of mainly yellow, orange, or red fat-soluble pigments, including carotene, which give colour to plant parts such as ripe tomatoes and autumn leaves. ABA is formed after cleavage of C40 carotenoids Answer : (b)
Q.48
Peristome teeth of moss shows ... .. [ RPMT 2000 ]
0%
a) Hydrochasy
0%
b) Xerochasy
0%
c) Hydrotropism
0%
d) Chemotropism
Explanation
In mosses, the peristome is a specialized structure in the sporangium that allows for gradual spore discharge, instead of releasing them all at once. Each peristome is a ring of triangular "teeth" formed from the remnants of dead cells with thickened cell walls. Xerochasy is defined as, the release of seeds when the seed pods dry out. Answer : (b)
Q.49
Which method makes the seed coat permeable and allows growth of embryo? ... ... [ AFMC 2007]
0%
a) Scarification
0%
b) Stratification
0%
c) Vernalisation
0%
d) Denudation
Explanation
Scarification is important methods of seed scarification include heat, freeze-thaw, mechanical and acid scarification. Heat scarification is the method that uses high temperatures to break or crack seed coat It makes seed coat permeable. This method is employed for plant species which are impervious to water and gases. Answer : (a)
Q.50
In sigmoid growth curve, upper asymptote represents period of ... ..... [ AMU 2009]
0%
a) Establishment
0%
b) Negative acceleration
0%
c) Positive acceleration
0%
d) Equilibrium
Explanation
In a sigmoid growth curve, the upper limit of the curve is called as upper asymptote. It represents the period of equilibrium. At this stage, birth rate and death rate are at balance. It is said to be at equilibrium because at this stage, there is equilibrium between biotic potential and environmental resistance. Answer : (d)
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