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Quiz 7
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Q.1
Find the correct statements ... .... [ BHU 2008] Causal organism of foolish seedling disease is source of gibberellin Ascorbic acid is growth promoter Ratio of auxin to cytokinin controls differentiation Bolting of cabbage can be induced by treatment with IAA
0%
a) 1, 2, 3 correct
0%
b) 1, 2 correct
0%
c) 2, 4 correct
0%
d) 1, 3 correct
Explanation
Gibberellin (GA) was first isolated in Japan in the 1930s from a fungus that causes a serious disease in rice, called “foolish seedling disease”. Statement "1" is correct Ascorbic acid functions as a major redox buffer and as a cofactor for enzymes involved in regulating photosynthesis, hormone biosynthesis, and regenerating other antioxidants. Statement "2" is NOT correct Ascorbic acid functions as a major redox buffer and as a cofactor for enzymes involved in regulating photosynthesis, hormone biosynthesis, and regenerating other antioxidants or controls differentiation. Statement "3" is correct Bolting can be induced artificially by the application of gibberellin. Statement "4" is NOT correct. Answer : (d)
Q.2
Vernalisation is ... .... [ AMU 1999 ]
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a) Growth curve related to light
0%
b) Effect of photoperiods on plant growth
0%
c) Speeding up ability to flower by low temperature treatment
0%
d) Diurnal photoperiodicity
Explanation
Vernalisation is speeding up ability to flower by low temperature treatment Answer : (c)
Q.3
Chemicals having profound effect on growth and development are .... ... [ MPPMT 1997]
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a) Enzymes
0%
b) Phytohormones
0%
c) Catalytic agent
0%
d) Manure
Explanation
The various types of hormones which are created by plants that control or regulate 'germination', 'growth', 'metabolism', or other 'physiological activities' are called phytohormone. Answer : (b)
Q.4
Which statements are correct? ... .... [ kerala 2005] a - Cytokinins suppress the synthesis of chlorophyll b - Auxins control apical dominance c - Gibberellin promote shoot elongation d- Abscisic acid enables seeds to withstand desiccation
0%
a) a and b only
0%
b) b and c only
0%
c) a and c only
0%
d) b, c and d only
Explanation
Cytokinin accelerates chlorophyll biosynthesis by promoting ALA synthesis and enhancing POR activity. Statement "a" is NOT correct Statement "b", "c" and "d" are correct statement Answer : (d)
Q.5
Size of grapes increases in application of ... ... [ CET Chd 2003]
0%
a) Gibberellin
0%
b) Auxin
0%
c) Cytokinin
0%
d) All the above
Explanation
Gibberellins (GAs) applied to grapes, apricot, nectarine, peach, and plum trees often produce fruit to achieve acceptable market size Answer : (a)
Q.6
Phytochrome which induces triple response is ... ... [ JKCMEE 2008]
0%
a) IAA
0%
b) ABA
0%
c) GA3
0%
d) C2H4
Explanation
Ethylene causes what is known as the "triple response" in plants: it causes plants to have short shoots, fat shoots, and increased lateral root growth. Answer : (d)
Q.7
Gibberellin application to a plant brings about ... ... [ AFMC 1993]
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a) Leaf fall
0%
b) Diversification of shoot system
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c) Elongation of shoot system
0%
d) Delay in senescence
Explanation
Stem elongation is regulated by complex signaling pathways involving various hormones, including auxin, brassinolide, and gibberellin 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 : (c)
Q.8
Movement of Sunflower towards the direction of Sun is ... ... [ HarPMT 2000 ]
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a) Photonasty
0%
b) Phototropism
0%
c) Nyctinasty
0%
d) Seismonasty
Explanation
Movement of Sunflower towards the direction of Sun is Phototropism known as Heliotropism Answer : (b)
Q.9
Importance of day length in flowering of plants/photoperiodism was first observed in ... ..... [ CBSE 2010]
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a) Cotton
0%
b) Tobacco
0%
c) Lemna
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d) Petunia
Explanation
Photoperiodism was first discovered by Garner and Allard (1920, 1922). They observed that maryland mammoth variety of tobacco could be made to flower only by reducing the light hours with artificial darkning. Answer : (b)
Q.10
Apical dominance as found in higher plants is due to ... ... [ CPMT 1993]
0%
b) Phototropism
0%
a) Photoperiodism
0%
c) Hormones
0%
d) Enzymes
Explanation
Apical dominance as found in higher plants is due to to hormone Auxin Answer : (c)
Q.11
Which one of the following growth regulators is known as 'stress hormone' ?... [AIPMT 2014]
0%
a) GA3
0%
b) Indole acetic acid
0%
c) Abscisic acid
0%
d) Ethylene
Explanation
Abscisic acid is called stress hormones as it induces various responses in plants against stress conditions. Answer:(c)
Q.12
One of the commonly used plant growth hormone in tea plantation is ... .... [ CBSE 2010]
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a) Zeatin
0%
b) ABA
0%
c) IAA
0%
d) Ethylene
Explanation
Tea plants are grown by stem cuttings. If we dip the lower cut end of a cutting in a dilute solution of auxins (IAA, IBA etc) , large number large number of roots are developed on the cut ends, due to which these cutting develop into successful plants. Answer : (c)
Q.13
Which is used as a weedicide? .... .... [ JIPMER 2004]
0%
a) Indole Acetic acid
0%
b) Napthalene Acetic acid ( NAA)
0%
c) Indole Butyric acid (IBA)
0%
d) 2, 4-D
Explanation
2, 4-D is weedicide Answer : (d)
Q.14
Pigment involved in seed germination and floral induction is ... ... [ JIPMER 1996]
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a) Florigen
0%
b) Plastocyanin
0%
c) Phytochrome
0%
d) Chlorophyll
Explanation
Many flowering plants use t to regulate the time of flowering based on length of day and night, photoperiodism and to set circadian rhythms. It also regulates other responses including the germination of seeds ( photoblasty), elongation of seedling of chlorophyll, and the straightening of epicotyl or hypocotyl hook of dicot seedlings Answer : (c)
Q.15
Leaf fall occurs in a tree when there is increase in concentration of ... ... [ KCET 2005]
0%
a) Gibberellin
0%
b) Cytokinin
0%
c) Auxin
0%
d) Abscisic acid
Explanation
Abscisic acid because of the formation of abscission layer which is responsible for fall of mature leaves and fruits from plants Answer : (d)
Q.16
Which ones function as regulators ... ... [ JIPMER 2003]
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a) Carbohydrates
0%
b) Lipids
0%
c) Proteins
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d) Vitamins and minerals
Explanation
Vitamins have diverse biochemical functions. Vitamins and minerals acts as a regulator of cell and tissue growth and differentiation Answer : (d)
Q.17
Some plants harbor ants to save themselves from other animals. It is ... .... [ kerala 2006]
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a) Anemophily
0%
b) Entomophily
0%
c) Myrmecophily
0%
d) Hydrophily
Explanation
Myrmecophily (literally "ant-love") is the term applied to positive interspecies associations between ants and a variety of other organisms such as plants, other arthropods, and fungi. Anemophily or wind pollination is a form of pollination whereby pollen is distributed by wind. Entomophily or insect pollination is a form of pollination whereby pollen of plants, especially but not only of flowering plants, is distributed by insects. Hydrophily form of pollination whereby pollen is distributed by the flow of waters, particularly in rivers and streams. Answer : (c)
Q.18
What is the role of auxin? ... ... [ CMC 2003]
0%
a) Prevents abscission of leaves and fruits
0%
b) Promotes abscission of leaves and fruits
0%
c) Promotes stomatal closure
0%
d) Promotes dormancy
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. Answer : (a)
Q.19
Pick up the correct explanation .... ... [ MAnipal 2001]
0%
a) Xanthium - Long day plant
0%
b) Sunflower - short day plant
0%
c) Wheat - Short day plant
0%
d) Tomato - Day neutral plant
Explanation
Tomato plants are day-neutral, meaning that they will flower independently of the day length. Option "d" correct match Xanthium is short day plant.Option "a" is NOT a correct match Sunflowers is day-neutral. Option "b" is NOT a correct match Wheat is long day plant. Option "c" is NOT a correct match Answer : (d)
Q.20
During which phase of growth, cell increases in volume ... ... [ Guj CET 2006]
0%
a) Exponential
0%
b) Cell division
0%
c) Differentiation
0%
d) Enlargement
Explanation
During the exponential phase, the cells grow by doubling But during Enlargement phase, the cell growth is an increase in cell size, Answer : (a)
Q.21
Growth promoting hormone is ... .... [ BHU 2008]
0%
a) 2,4-D
0%
b) ABA
0%
c) Gibberellin
0%
d) IAA
Explanation
IAA is plant hormone of the auxin class and is Growth promoting hormone Answer : (d)
Q.22
In growth curve, maximum growth occurs during ... ...
0%
a) Lag phase
0%
b) Senescent phase
0%
c) Decline phase
0%
d) Exponential phase
Explanation
During the exponential phase, the cells grow by doubling Answer : (d)
Q.23
Which one is not correctly matched? ... ..... [ CBSE 2007]
0%
a) Cytokinin - cell division
0%
b) IAA - cell wall elongation
0%
c) Abscisic acid - stomatal closure
0%
d) Gibberellic acid- Leaf fall
Explanation
Answer : (d)
Q.24
Assertion: Photomodulation of flowering is a phytochrome regulated process. Reason: Active form of phytochrome (Pfr) directly induces floral induction in shoot buds ... ... [ AIIMS 2004]
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
Photomodulation of flowering, also called photoperiodism, is regulated by phytochromes only.Assertion is a correct statement Pfr of phytochrome is required for flowering in long-day plants and inhibits flowering in short-day plants. Floral induction is dependent on other factors—such as photoperiod, vernalization or GA signaling—which regulate the transcription of SPL genes and other genes involved in flowering. Reason is false statement Answer:(c)
Q.25
The process of vernalisation is ... ... [ MHTCET 2010]
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a) Aerobic
0%
b) Anaerobic
0%
c) Unaffected by aerobic or anaerobic conditions
0%
d) Dependent upon starvation conditions
Explanation
The vernalization is an aerobic process and requires metabolic energy. In the absence of oxygen cold treatment becomes completely inefficient. Sufficient amount of water is also essential. Vernalization of dry seeds is not possible. Answer : (a)
Q.26
Assertion: Plants also have hormones called phytohormones Reason: They increase the rate of reactions and thus always accelerate growth and other related changes ... .... [ AIIMS 2000 ]
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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
Plants also have hormones called phytohormones. Assertion is correct statement Phytohormones are chemical messengers that coordinate cellular activities. Reason is false statement Answer : (c)
Q.27
Anti-gibberellin is ... ... [ BHU 2002]
0%
a) Cycocel
0%
b) Plastoquinone
0%
c) IAA
0%
d) Ubiquinone
Explanation
The most characteristic effects of GA on shoot growth are increased inter‐node extension, increased leaf‐growth and enhanced apical dominance. While Cycocel reduced the height, leaf area, but increased the branch number. Answer : (a)
Q.28
Apical dominance in higher plants is due to ....
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a) Enzyme activity
0%
b) Photoperiodism
0%
c) Carbohydrate-nitrogen ratio
0%
d) Balance between auxin and cytokinins
Explanation
Auxin is responsible for apical dominance while Cytokinins are involved in many plant processes, including cell division and shoot and root morphogenesis. They are known to regulate axillary bud growth and apical dominance. Thus Apical dominance in higher plants is due to balance between auxin and cytokinins Answer : (d)
Q.29
Nutation is shown by .... ... [ Har PMT 2007]
0%
a) Root
0%
b) Stem
0%
c) Tendrils
0%
d) Leaves
Explanation
Nutation refers to the bending movements of stems, roots, leaves and other plant organs caused by differences in growth in different parts of the organ. Answer : (c)
Q.30
High concentration of auxin is present in ... ..... [ MPPMT 2000 ]
0%
a) Root apex
0%
b) Shoot apex
0%
c) Petiole
0%
d) Node
Explanation
High concentration of auxin is present in Shoot apex Answer : (b)
Q.31
Flowering response to length of day and night in plants is called ... ... [ MPPMT 2012]
0%
a) Phototropism
0%
b) Photorespiration
0%
c) Photoperiodism
0%
d) Photo-oxidation
Explanation
Flowering response to length of day and night in plants is called Photoperiodism Plants regulate photoperiodism by measuring the Pfr/Pr ratio at dawn, which then stimulates physiological processes such as flowering Photoperiodism is controlled by a flowering hormone called florigen, Answer : (c)
Q.32
Effect of day length duration on plant development/flowering is ... ... [ AMU 2001]
0%
a) Chemotropism
0%
b) Phototropism
0%
c) Photoperiodism
0%
d) Photonasty
Explanation
This relative length of day and night needed for flowering is called as photoperiod. The length of the day and night above and below which a plant would not flower is called critical photoperiod. Answer : (c)
Q.33
Seeds of winter varieties are benefitted by technique .... .... [ JKCMEE 2010]
0%
a) Senescence
0%
b) Photoperiodism
0%
c) Vernalisation
0%
d) Abscission
Explanation
Vernalization is the induction of a plant's flowering process by exposure to the prolonged cold of winter, or by an artificial equivalent. Many plant species will only produce flowers and fruit in regions with a cold winter. This is because of a process known as vernalization. Apple and peach trees, tulips and daffodils, hollyhocks and foxgloves, and many other plants wouldn't produce their flowers or fruit without vernalization. Answer : (c)
Q.34
Leaf fall can be prevented with the help of ... ... [ MHTCET 2010]
0%
a) Abscisic acid
0%
b) Auxins
0%
c) Florigen
0%
d) Cytokinins
Explanation
Cytokinin production slows down the process of senescence. Leaf senescence consists of the orderly degradation of the cells of the leaf, leading to cell death, and ultimately to leaf fall. Answer : (d)
Q.35
Cytokinins which have specific effect in cytokinesis are modified forms of ... .... [ HPPMT 2010]
0%
a) Cytosine
0%
b) Adenine
0%
c) Guanine
0%
d) Thiamine
Explanation
Cytokinins are compounds with a structure resembling adenine which . The most common form of naturally occurring cytokinin in plants today is called zeatin . Cytokinin biosynthesis happens through the biochemical modification of adenine. Answer : (b)
Q.36
Synthetic auxins are employed for ... .. [ kerala 2003]
0%
a) Ripening of fruits
0%
b) Increasing size of fruits
0%
c) Killing weeds
0%
d) Preventing elongation of internodes
Explanation
These herbicides are chemical analogues of auxin, a plant growth hormone, and produce uncontrolled and lethal growth in target plants. 2,4-D (synthetic auxin) is one of the most widely used herbicides throughout the world, and is primarily used in agriculture to control weeds in corn and grain, forestry, and lawn care practices. Answer : (c)
Q.37
The first to activate dormant embryo is .... ..... [ MHTCET 2011]
0%
a) Oxygen
0%
b) Moisture
0%
c) Hormones
0%
d) Nutrients
Explanation
Answer : (b)
Q.38
At the time of seed germination, digestive enzymes are induced to be formed under the influence of .... ... [ Guj CET 2006]
0%
a) Cytokinin
0%
b) Gibberellins
0%
c) Ethylene
0%
d) Auxin
Explanation
germination process can be distinguished into three phases: phase I, rapid water imbibition by seed; phase II, reactivation of metabolism; and phase III, radicle protrusion. Water imbibition by reserve substances in germinating seed stimulates the embryo to produce phytohormones mainly gibberellic acid (GA) which can diffuse to aleurone layer and initiate a signaling cascade resulting in the synthesis of digestive enzymes such as α-amylases and other hydrolytic enzymes. Then, hydrolytic enzymes secrete into the endosperm and hydrolyzed food reserve. Answer : (b)
Q.39
Naturally occurring auxin is .... ... [ JIPMER 2004]
0%
a) NAA
0%
b) 2, 4-D
0%
c) MH
0%
d) IAA
Explanation
Answer : (d)
Q.40
Beta vulgaris is .... .... [ JKCMEE 2007]
0%
a) SDP
0%
b) LDP
0%
c) DNP
0%
d) IDP
Explanation
Beta vulgaris (sugar beet), flower when the day length is less than the critical length were called short-day (SDP) plants. Answer : (c)
Q.41
The hormone capable of replacing the requirement of long photoperiods for flowering is ... .. [ CPMT 1990]
0%
a) Ethylene
0%
b) Auxin
0%
c) Gibberellin
0%
d) Cytokinin
Explanation
Long-day plants also flower earlier when treated with gibberellin under both long and short photoperiods. Answer : (c)
Q.42
Auxanometer is sued to measure plant organ .... ... [ JKCET 2011]
0%
a) Growth in length
0%
b) Growth in breadth
0%
c) Pest population
0%
d) Both a and b
Explanation
Auxanometer is sued to measure plant growth in length Answer : (a)
Q.43
Leaves of many grasses are capable of folding and unfolding because they ... ... [ Odisha 2004]
0%
a) Are very thin
0%
b) Are isobilateral
0%
c) Have specialised bulliform cells
0%
d) Have parallel vascular bundles
Explanation
Bulliform cells or motor cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many monocots. They are involved in folding and unfolding of leaf tissue in order to control light intensity and reduce overall water loss. Answer : (c)
Q.44
Gaseous growth hormone is ... ... [ BHU 2000 ]
0%
a) IAA
0%
b) GA
0%
c) Kinetin
0%
d) Ethylene
Explanation
Ethylene is gaseous growth hormone Answer : (d)
Q.45
Vernalisation is seen in ... .... [ AMU 2011]
0%
a) Sugarbeet
0%
b) Carrot
0%
c) Cabbage
0%
d) All the above
Explanation
Vernalization, is exposure of plants (or seeds) to low temperatures. Cool-season vegetables thrive in areas where the mean daily temperature does not rise above 70° F (21° C) This group includes the artichoke, beet, broccoli, brussels sprouts, cabbage, carrot, cauliflower, celery, garlic, leek, . Answer : (d)
Q.46
Hormone discovered through tissue culture technique is ... .... [ AMU 1997]
0%
a) Auxin
0%
b) Cytokinin
0%
c) Gibberellin
0%
d) Abscisic acid
Explanation
Folke Skoog had a lab that was trying to grow plant cells in culture to to study how shoot tissues formed The first cytokinin discovered by F. Skoog, C. Miller and co-workers was an adenine (aminopurine) derivative named kinetin (6-furfuryl- aminopurine Answer : (b)
Q.47
Fruit ripening is promoted by ... .... [ DPMT 2002]
0%
a) Ethylene
0%
b) SO2
0%
c) CO2
0%
d) Nitrogen
Explanation
Fruit ripening is promoted by Ethylene Answer : (a)
Q.48
Movement stimulated by external factor is ... .... [ RPMT 2005]
0%
a) Spontaneous movement
0%
b) Autonomic movement
0%
c) Physical movement
0%
d) Paratonic movement
Explanation
Paratonic movement is the movement of the whole or parts of a plant due to the influence of an external stimulus, such as gravity, chemicals, heat, light, or electricity. Answer : (d)
Q.49
During drought, plants develop hormone ... ... [ JIPMER 2003]
0%
a) Indole acetic acid
0%
b) Naphthalene acetic acid
0%
c) Indolebutyric acid
0%
d) Abscisic acid
Explanation
Plant hormones are crucial factors in transducing the stress signal and the main player among them is abscisic acid (ABA). Among lifecycle processes controlled by ABA are: inhibition of germination, restriction of shoot and root growth, and stomatal closure. Answer : (d)
Q.50
Given above is a graph showing growth versus time. A, B, and C represent ... .... [ kerala 2007]
0%
a) Exponential phase, lag phase and steady state phase
0%
b) Steady state phase, lag phase and long phase
0%
c) Slow growing phase, lag phase, steady state phase
0%
d) Log phase, lag phase and steady state phase
Explanation
Answer : (b)
0 h : 0 m : 1 s
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