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Quiz 4
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Q.1
Leaf abscission is brought about by ... ..... [ BHU 2006]
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a) Auxin
0%
b) Cytokinin
0%
c) Gibberellin
0%
d) ABA
Explanation
Answer : (d)
Q.2
Phytochrome absorbs visible light maximum in red region at ... .... [ AFMC 1997]
0%
a) 600 nm
0%
b) 650 nm
0%
c) 660 nm
0%
d) 730 nm
Explanation
Light acts on phytochrome to change it from an inactive form, with maximum absorption in the red part of the spectrum 660 nm Answer : (c)
Q.3
Common inhibitor of germination is ... .... [ JIPMER 2002]
0%
a) GA
0%
b) ABA
0%
c) Pantothenic acid
0%
d) Tartaric acid
Explanation
Abscisic acid (ABA) is responsible for the inhibition of germination in dormant seeds, despite every condition being suitable Answer : (b)
Q.4
Apical dominance is caused by .... ...[ CBSE 1992]
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a) Abscisic acid in lateral bud
0%
b) Cytokinin in leaf tip
0%
c) Gibberellin in lateral buds
0%
d) Auxin in shoot tip
Explanation
Apical dominance is caused by Auxin in shoot tip Answer : (d)
Q.5
Synthetic plant hormone is ... ... [ CBSE 2009]
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a) IAA
0%
b) 2,4-D/NAA
0%
c) GA
0%
d) Zeatin
Explanation
Naphthyl Acetic Acid (NAA) is a synthetic plant hormone in the auxin family 2,4-dichlorophenoxyacetic acid (2,4-D) is a synthetic auxin that has been used as one of the most common herbicides to control broadleaf weeds Answer : (d)
Q.6
Types of plants that come to flower after exposure to short photoperiods followed by long photoperiods ... .... [ AMU 2002]
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a) Intermediate plants
0%
b) Day neutral plants
0%
c) SLDP
0%
d) LSDP
Explanation
Short-Long day plants (SLDP) flower after a series of long days followed by short days whereasshort long day plants (SLDPs) flower after a series of short days followed by long days. Each plant has a different length critical photoperiod, or critical night length. Answer : (c)
Q.7
Klinostat is employed in the study of ... .... [ CBSE 1993]
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a) Osmosis
0%
b) Growth movements
0%
c) Photosynthesis
0%
d) Respiration
Explanation
klinostat A device used in experiments to test the influence of gravity on the growth movements of plants It consists of a motor that slowly rotates a drum inside which seedlings are attached, it reduces the effect of gravity on organisms, chiefly used with plants. Answer : (b)
Q.8
Vernalisation occurs in response to ... .... [ DPMT 2002]
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a) High light intensity
0%
b) Low temperature
0%
c) High temperature
0%
d) Low light intensity
Explanation
Vernalisation occurs in response to Low temperature Answer : (b)
Q.9
Bakane disease of Rice is due to ... ... [ JIPMER 1998]
0%
a) NAA
0%
b) 2, 4-D
0%
c) IAA
0%
d) GA
Explanation
Gibberellic acid (GA) found in plant Gibberellin (GA) was first isolated from a fungus that causes a serious disease in rice, called “foolish seedling disease” (bakanae-byo) by Japanese farmers. Answer : (d)
Q.10
Auxin synthesis occurs in ... .... [ JIPMER 2004 ]
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a) Root/shoot tips
0%
b) Cortex
0%
c) Xylem
0%
d) Phloem cells
Explanation
Auxin synthesis occurs in Root/shoot tips Answer : (a)
Q.11
Gibberellin is a ... ... [ Har PMT 2005]
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a) Sterol
0%
b) Vitamin
0%
c) Sugar
0%
d) Protein
Explanation
Answer : (a)
Q.12
A plant hormone that induces morphogenesis in plant tissue culture is .... ... [ CBSE 1998]
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a) Abscisic acid
0%
b) Gibberellin
0%
c) Cytokinin
0%
d) Ethylene
Explanation
Morphogenesis is the biological process that causes a cell, tissue or organism to develop its shape. Cytokinins are a class of plant hormones that help regulate plant morphogenesis Answer : (c)
Q.13
Cholodny-Went theory is connected with ... ...[ BHU 2008]
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a) Photomorphogenesis
0%
b) Phototropism
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c) Geotropism
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d) Both b and c
Explanation
Cholodny-Went theory, which states that plant tropisms in roots and shoots are due to the unequal distribution of the growth regulator auxin in reponse to light or gravity, presented a simple and direct explanation of these phenomena. Answer : (d)
Q.14
Cytokinins .... ... [ CBSE 1992]
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a) Promote abscission
0%
b) Influence water movement
0%
c) Help retain chlorophyll
0%
d) Inhibit protoplasmic streaming
Explanation
Cytokinin regulates nuclear and plastid gene expression and alters protein abundance to exert its role on chloroplast development and function. Answer : (c)
Q.15
Phototropic curvature is result of uneven distribution of ... ... [ CBSE 2010]
0%
a) Auxin
0%
b) Gibberellin
0%
c) Starch
0%
d) Phytochrome
Explanation
Phototropic curvature is result of uneven distribution of Auxin Answer : (a)
Q.16
Pick up correct statements .... ... [kerala 2008] a) Cytokinins delay senescence b) Auxins regulate apical dominance c) Ethylene enhance seed germination d) Gibberellins cause falling of immature leaves
0%
a) a, c
0%
b) a, d
0%
c) a, b
0%
d) b, c
Explanation
cytokinin accelerate senescence Answer : (c)
Q.17
IAA precursor is .... .... [ CPMT 1990]
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a) Tryptophan
0%
b) Leucine
0%
c) Tyrosine
0%
d) Phenylalanine
Explanation
IAA can be synthesized through the precursor tryptophan (Trp) leucine is a metabolic precursor, alpha-ketoisocaproate and ketone bodies Tyrosine is a precursor of the adrenal hormones epinephrine and norepinephrine as well as of the thyroid hormones Phenylalanine is a precursor for tyrosine Answer : (a)
Q.18
Ethylene is metabolic product of ... ...
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a) Valine
0%
b) Serine
0%
c) Methionine
0%
d) Glutamic acid
Explanation
Answer : (c)
Q.19
Herbicides are chemicals which control ... ... [ BHU 1994]
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a) Insects
0%
b) Fungi
0%
c) Weeds
0%
d) Nematodes
Explanation
Herbicides are chemicals which control Weeds Answer : (c)
Q.20
Which in not caused by deficiency of mineral nutrition? ... ..... [ CBSE 1997]
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a) Chlorosis
0%
b) Internode shortening
0%
c) Necrosis
0%
d) Etiolation
Explanation
Etiolation is a process in flowering plants grown in partial or complete absence of light. It is characterized by long, weak stems; smaller leaves due to longer internodes; and a pale yellow color Etiolation is the result of hormones called auxins. Auxins are transported from the actively growing tip of the plant downwards, resulting in the suppression of lateral buds. Answer : (d)
Q.21
Which flower shows nyctinastic movement? ... ... [ Pb. PMT 2005]
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a) Albizia lebbeck
0%
b) Pentapetes
0%
c) Mimosa pudica
0%
d) Bryophyllum
Explanation
When the Mimosa pudica, commonly known as the sensitive plant, is touched by another organism, its leaves fold in upon themselves and its stems droop Answer : (b)
Q.22
Leaf of Mimosa droops down on touching because of ... ... [ BHU 2000 ]
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a) Water loss from leaf bases
0%
b) Changes in water concentration
0%
c) Loss of water from cells to intercellular spaces in pulvinus and pulvinules
0%
d) All the above
Explanation
The movement of Mimosa pudica is driven by turgor pressure, Mimosa plant droops when touched because of loss of water cells to intercellular spaces in pulvinus and pulvinules. Answer : (c)
Q.23
A long day plant flowers only when it is exposed to ... .... [ AMU 2001]
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a) Red light
0%
b) Light more than critical day length
0%
c) Light equal to critical day length
0%
d) Light less than critical day length
Explanation
Long-day plant is a plant that flowers only after being exposed to light periods longer than a certain critical length, as in summer. Answer : (b)
Q.24
Some early experiments on phototropic curvature in grasses led to discovery of ... ... [ Pb PMT 1998]
0%
a) Auxins
0%
b) Gibberellins
0%
c) Cytokinins
0%
d) None of the above
Explanation
Phototropism is the growth of an organism in response to a light stimulus. Dutch botanist Fritz W. Went finally isolated auxin diffused out from the tip of oat coleoptiles in the gelatin block. Answer : (a)
Q.25
Hormone found in liquid endosperm of Coconut/Coconut milk factor is ... ... [ AFMC 2007]
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a) Gibberellin
0%
b) Auxin
0%
c) Ethylene
0%
d) Cytokinin
Explanation
The hormones cytokinins are found in coconut water. Answer : (d)
Q.26
Day neutral plants ... ... [ JKCMEE 2011]
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a) Lose activity during day time
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b) Flower in all possible photoperiods
0%
c) Become overactive during day time
0%
d) Do not flower in any photoperiod
Explanation
"Day neutral" plants form flowers regardless of day length. Answer : (c)
Q.27
Which one shows red ⇄ far-red interconversions? .... .. [ BHU 1995]
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a) Carotenoids
0%
b) Cytochromes
0%
c) Chlorophylls
0%
d) Phytochrome
Explanation
Phytochromes are unique among photoreceptors in their capacity to interconvert between a red-absorbing form (absorption maximum of ∼660 nm) and a far-red absorbing form (absorption maximum of ∼730 nm), which occur in a dynamic equilibrium within plant cells, corresponding to the proportions of red and far-red energy in ambient light. Answer : (d)
Q.28
Hormone antagonist to gibberellins is ... ...
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a) IAA
0%
b) ABA
0%
c) Zeatin
0%
d) Ethylene
Explanation
Abscisic acid
Gibberellic acid
It inhibits growth
It promotes growth
It promotes the dormancy of seeds, buds and tubers
It overcomes the natural dormancy of seeds, tubers, etc
It inhibits the synthesis of RNA and proteins
It promotes the synthesis of RNA and proteins
Causes abscission of flowers and fruits.
Promotes development of fruits
Promotes leaf senescence
Prevents leaf senescence
Promotes stomata closure
Promotes stomatal opening
Prevents amylase activity
Promotes amylase activity during seed germination
Answer : (b)
Q.29
Phytochrome is found in ... ...[ AFMC 2003]
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a) Algae
0%
b) Fungi
0%
c) Vascular cryptogams
0%
d) Flowering plants
Explanation
Phytochrome is a blue-green plant pigment which regulates plant development, including seed germination, stem growth, leaf expansion, pigment synthesis, and flowering. Phytochrome has been found in most of the organs of seed plants and free-sporing plants. It has also been found in green algae. Answer : (d)
Q.30
Which is not a phytohormone? ... ... [ Har PMT 1994]
0%
a) Phytochrome
0%
b) Florigen
0%
c) GA
0%
d) IAA
Explanation
Florigen (or flowering hormone) is the hypothesized hormone-like molecule. Five groups of compounds—auxins, cytokinins (CKs), gibberellins (GAs), abscisic acid (ABA) and ethylene—are usually referred to as the classic phytohormones while more recently discovered brassinosteroids (BRs), salicylic acid (SA), jasmonic acid (JA) and strigolactones have been added to the list. Answer : (a)
Q.31
Essential requirement for seed germination is ... ... [ CPMT 2005]
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a) O2 and light
0%
b) H2O and O2
0%
c) H2O and high temperature
0%
d) Scarification and vernalisation
Explanation
Seed germination depends on both internal and external conditions. The most important external factors include right temperature, water, oxygen or air and sometimes light or darkness. Various plants require different variables for successful seed germination. Answer : (b)
Q.32
The process of growth is maximum during
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a) Senescence
0%
b) Dormancy
0%
c) Log phase
0%
d) Lag phase
Explanation
Answer : (c)
Q.33
Cardinal temperature is related to ... .... [ AIIMS 1999 [
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a) Minimum temperature
0%
b) Optimum temperature
0%
c) Maximum temperature
0%
d) All the above
Explanation
Regardless of how favourable light and moisture conditions may be, plant growth ceases when the air and leaf temperature drops below a certain minimum or exceeds a certain maximum value. Between these limits, there is an optimum temperature at which growth proceeds with greatest rapidity. These three temperature points are the cardinal temperatures for a given plant Answer : (d)
Q.34
Which one hastens flowering in plants .... ... [ MHTCET 2011]
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a) Stratification
0%
b) Scarification
0%
c) Vernalisation
0%
d) Water deficit
Explanation
Vernalisation induces early flowering there by shortening the vegetative period of the plants Answer : (c)
Q.35
Bananas can be prevented from overripening by ... .... [ CBSE 1992]
0%
a) Maintaining them at room temperature
0%
b) Refrigeration
0%
c) Dipping in ascorbic acid solution
0%
d) Storing in a freezer
Explanation
ascorbic acid (Vitamin C) slows down the oxidation process Thus by dipping bananas in ascorbic acid solution prevents from overripening Answer : (c)
Q.36
Photoperiodic stimulus is picked up by .... ... [ BHU 2001]
0%
a) Phytohormones
0%
b) Stomata
0%
c) Phytochrome
0%
d) Enzymes
Explanation
Phytochromes are a class of photoreceptor in plants, bacteria and fungi used to detect light. Answer : (c)
Q.37
hich is essential for flowering .... ... [ Odisha 2012]
0%
a) Phytochrome
0%
b) Chlorophyll
0%
c) Cytochrome
0%
d) Leghaemoglobin
Explanation
Phytochrome regulate the germination of seeds (photoblasty), the synthesis of chlorophyll, the elongation of seedlings, the size, shape and number and movement of leaves and the timing of flowering in adult plants. Answer : (a)
Q.38
Substances that accumulate around a site of infection in plants is ... ... [ JIPMER 1999 ]
0%
a) Phytoalexins
0%
b) Proteinone
0%
c) Saponins
0%
d) All the above
Explanation
A phytoalexin is a compound which inhibits the developmentof the fungus in hypersensitive tissues and is formed or activated only when the host plants come in contact withthe parasite. Phytoalexins accumulate around a site of infection in plants Answer : (a)
Q.39
Which is not an influence of auxins .... ... [ KCET 2006]
0%
a) Tropical movements
0%
b) Bolting
0%
c) Parthenocarpy
0%
d) Apical dominance
Explanation
Bolting is induced by plant hormones of the gibberellin family. Answer : (b)
Q.40
Internodal elongation is stimulated by ... ... [ JKCET 2012]
0%
a) Auxin
0%
b) Phenol
0%
c) Cytokinin
0%
d) Gibberellin
Explanation
Answer : (d)
Q.41
Movement of auxin is ... ... [ CBSE 1994]
0%
a) Centripetal
0%
b) Basipetal
0%
c) Acropetal
0%
d) Both b and c
Explanation
Basipetal transport: Transport of various compounds including auxin from the tip towards the basis of the particular organ (stem or root). Acropetal transport: Transport of various compounds (including auxin) towards the tip of a particular organ (stem or root). Answer : (d)
Q.42
Shedding of leaves, flowers and fruits due to change in hormone balance in plants is ... ... [ JKCMEE 2005]
0%
a) Senescence
0%
b) Abscission
0%
c) Photoperiodism
0%
d) Vernalisation
Explanation
Abscission is the normal separation of a plant part or organ (leaves, flowers and fruits). Answer : (b)
Q.43
Abscisic acid causes ... ... [ CBSE 1999 ]
0%
a) Seed dormancy
0%
b) Apical dominance
0%
c) Root initiation
0%
d) Phototropism
Explanation
Abscisic acid functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure. Answer : (a)
Q.44
Growth of lateral branches is promoted by ... ... [ KCET 2002]
0%
a) Removal of axillary buds
0%
b) Auxin application over decapitated apex
0%
c) Auxin application over apical bud
0%
d) Removal of apical bud
Explanation
Removal of apical bud liftes apical dominance from the plant, elongation and lateral growth is promoted and the lateral buds grow into new branches. Answer : (d)
Q.45
In short day plants, flowering is induced by ... ...[ BHU 2001]
0%
a) Photoperiod less than 12 hours
0%
b) Photoperiod below a critical length and uninterrupted long night
0%
c) Long night
0%
d) Short photoperiod and interrupted long night
Explanation
Short Day Plants flowers when the period of uninterrupted darkness is less than the critical night length. Answer : (b)
Q.46
Which ones are long day plants... .. [ Guj CET 2007]
0%
a) Wheat, Poppy, Soybean
0%
b) Wheat, Poppy, Beet
0%
c) Wheat, Oat, Soybean
0%
d) Wheat, Xanthium,
Explanation
Long day plants : beet, wheat, spinach, poppy. short-day plants : Soybean, Xanthium, Paddy Answer : (b)
Q.47
Transport of cytokinin in the plant body is ... ... [ CET Chd 2011]
0%
a) Basipetal
0%
b) Lateral
0%
c) Acropetal
0%
d) One all sides
Explanation
cytokinin is synthesized in the roots and translocated via the xylem to shoots. Acropetal transport: Transport of various compounds (including auxin) towards the tip of a particular organ (stem or root). Answer : (c)
Q.48
Growth plotted against time gives a ... ... [MPPMT 1998]
0%
a) Parabolic curve
0%
b) Sigmoid curve
0%
c) Upright line
0%
d) Horizontal line
Explanation
Growth plotted against time gives a 'S' shaped curve obtained when growth is plotted against time. It is also called growth curve. Answer : (b)
Q.49
Rosette habit of cabbage can be changed by the application of ... ... [ KCET 2011]
0%
a) ABA
0%
b) IAA
0%
c) Ga
0%
d) Ethephon
Explanation
A Cabage is rosette pant. Rosette is a circular arrangement of leaves or of structures resembling leaves Just prior to flowering, internodes elongate enormously. This is called bolting shown in figure Bolting needs either long days or cold nights. When a cabbage head is kept under warm nights, it retains its rosette habit. Bolting can be induced artificially by the application of gibberellins under normal conditions. Answer : (c)
Q.50
Phototropism in shoots is attributed to or phototropic movements are due to ... .... [ AMU 1997]
0%
a) Auxin
0%
b) Gibberellins
0%
c) Cytokinin
0%
d) Abscisic acid
Explanation
Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant. This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism. Answer : (a)
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