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Neet Botany Plant Growth And Movements Mcq
Quiz 8
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Q.1
Phytochrome is .... ... [ MPMT 1995]
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a) Pigment that controls photomorphogenesis and development
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b) Regulatory protein that controls dark dependent development process.
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c) Hormone
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d) Photosynthetic hormone
Explanation
Photomorphogenesis is light-mediated development, where plant growth patterns respond to the light spectrum. Plants use phytochrome to detect and respond to red and far-red wavelengths. Phytochromes are signaling proteins that promote photomorphogenesis in response to red light and far-red light. Phytochromes are proteins with a light absorbing pigment attached called a chromophore. Answer : (a)
Q.2
Rapid and dramatic increase in shoot length is ... .... [ JKCMEE 2007]
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a) Bolting
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b) Triple growth response
0%
c) Scarification
0%
d) Night break reaction
Explanation
Bolting refers to the rapid lengthening of the plant stem, and is due to the coordinated effects of developmental and environmental factors. Answer : (a)
Q.3
Jerky lateral leaflet movements of Desmodium gyrans are ... ... [ CPMT 1991]
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a) Negative geotropic movements
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b) Positive geotropic movements
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c) Hydrotropic movements
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d) None of the above
Explanation
Desmodium gyrans also called as teligraph plant has large leaves that perform typical slow sleep (nyctinastic movement) movements at night as well as smaller stipules that move during the day in conspicuous quick elliptical circles every few minutes, and under high temperatures (35°C) may execute a round in 90 sec Answer : (d)
Q.4
Growth in internodal regions of green plants is due to ... .... [ AFMC 2008]
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a) Ethylene
0%
b) Cytokinins
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c) Gibberellins
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d) IAA
Explanation
The most characteristic effects of Gibberellins on shoot growth are increased inter‐node extension, increased leaf‐growth and enhanced apical dominance. Answer : (c)
Q.5
One set of plants exposed to 12 hr day and 12 hr night flowered. The other set with similar exposure to day-night period but with dark period interrupted by flash or light did not come to flower. The plant is ... ... [ Pb PMT 2007]
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a) Long day
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b) Day neutral
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c) Indeterminate
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d) Short day
Explanation
A short-day plant requires uninterrupted darkness when such plant is exposed to dark period interrupted by flash or light did not come to flower Answer : (d)
Q.6
Sometimes Potato sprouts during storage due to formation of ... ..[ CET Chd 1997]
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a) Ethylene
0%
b) Gibberellin
0%
c) Cytokinin
0%
d) Auxin
Explanation
The phytohormones cytokinins (CK) and gibberellins (GA) play important roles in releasing potato tuber dormancy and promoting sprouting. Maleic hydrazide is a synthetic compound which has a plant growth regulating action. It is used as a foliar treatment of potatoes to prevent volunteer formation and sprouting during storage. Answer : (b)
Q.7
Through their effect on phytohormones, temperature and light control ... ... [ CBSE 2012]
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a) Stomatal closure
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b) Apical dominance
0%
c) Flowering
0%
d) Fruit development
Explanation
Through their effect on phytohormones, temperature and light control Flowering Answer : (c)
Q.8
Gibberellins induce ... ... [ AIIMS 2005]
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a) Cell division
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b) Leaf senescence
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c) Hydrolysing enzymes in germination seeds
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d) Flowering
Explanation
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 : (c)
Q.9
Cyanobacteria shows motion in response to light. ... ...
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a) Phototropism
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b) Photolysis
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c) Phototaxis
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d) Photonasty
Explanation
Cyanobacteria are a diverse group of photosynthetic bacteria that exhibit phototaxis, or motion in response to light. Phototaxis is a kind of taxis, or locomotory movement, that occurs when a whole organism moves towards or away from a stimulus of light. Answer : (c)
Q.10
Plant growth hormones extracted from a fungus and fish are respectively ... .. [ Tamil NAdu 2001]
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a) Gibberellins and zeatin
0%
b) Ethylene and cytokinin
0%
c) Auxin and 2-4-D
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d) Gibberellin and kinetin
Explanation
Plant growth hormones extracted from a fungus and a fish are respectively. Gibberellin and kinetin. Answer : (d)
Q.11
Phytotron is a device by which ... ... [ Pb.PMT 2000 ]
0%
a) Electrons are bombarded
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b) Protons are liberated
0%
c) Plants are grown in controlled environment
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d) Mutations are produced in plants
Explanation
The phytotron is a sophisticated greenhouse equipped with precise means of controlling the environment and thus enables study and research of plant responses to climatic and environmental changes. The phytotron is an important tool for basic and applied research whose importance has increaseed in recent years due to the implications of global climate change on agriculture. Answer : (c)
Q.12
Abscisic acid causes ... .... [ CBSE 1991]
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a) Stomatal closure
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b) Stem elongation
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c) Leaf expansion
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d) Root elongation
Explanation
Abscisic acid (ABA) is a plant hormone involved in the response of plants to reduced water availability. Reduction of guard cell turgor by ABA diminishes the aperture of the stomatal pore and thereby contributes to the ability of the plant to conserve water during periods of drought. Answer : (a)
Q.13
Growth of both stem and root is mediated by auxin. However, stem grows into air while root grows into soil. The reason is ... ... [ CPMT 1990]
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a) Differential reaction of root and stem to auxin
0%
b) Only the stem tip produces auxin
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c) Only the root tip produces cytokinin
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d) Only the root cap can perceive gravity
Explanation
Both phototropism and geotropism are controlled by the distribution of auxin within the plant cells: In geotropism, auxin will accumulate on the lower side of the plant in response to the force of gravity. In phototropism, light receptors (phototropins) trigger the redistribution of auxin to the dark side of the plant. Answer : (a)
Q.14
Which of the following plant function is not controlled by auxins ... .... [ AMU 2010]
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a) Apical dominance
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b) Photosynthesis
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c) Photoperiodism
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d) Growth
Explanation
It is hypothesized that photoperiodism is controlled by a flowering hormone called florigen, although such a hormone has never been identified. Auxins, such as indole butyric acid (IBA), have been demonstrated to regulate plants' responses to drought, its photosynthetic apparatus, and the chloroplast structure Answer : (c)
Q.15
6-furfuryl amino purine, 2,4-dichloro-phenoxy acetic acid and indole 3-acetic acid are ... ... [ AFMC 2009]
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a) Synthetic auxin, kinetin and natural auxin
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b) Gibberellin, natural auxin and kinetin
0%
c) Natural auxin, kinetin and synthetic auxin
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d) Kinetin, synthetic auxin and natural auxin
Explanation
6-furfuryl aminopurine : kinetin 2,4-dichlorophenoxyacetic acid (2,4-D) is a synthetic auxin Indole-3-acetic acid (IAA, 3-IAA) is the most common naturally occurring plant hormone of the auxin class. Answer : (d)
Q.16
Plant growth is ... ... [ MPPMT 1999 ]
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a) Limited
0%
b) Unlimited
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c) Unlocalised
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d) Diffused
Explanation
The root and the shoot system of plants grow continuously from germination stage to the death or throughout the life span of the plant. It is called 'Unlimited' or 'indeterminate' type of growth Answer : (b)
Q.17
Photoperiodism influences ... .... [ MPPMT 2001]
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a) Seed germination
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b) Vegetative growth
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c) Internode elongation
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d) All the above
Explanation
Several variables might affect the germination, these variables include light, temperature, water, soil type, and air quality When combined with day-length, temperature also affects the change from vegetative (leafy) to reproductive (flowering) growth. Photoperiod does not seem to affect the elongation of the lower internodes directly, but it affects growth duration indirectly, thus influencing internode elongation. Answer : (d)
Q.18
Gibberellins are ... ...[ KCET 2006]
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a) Proteinaceous
0%
b) Amines
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c) Acidic
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d) Alkaline
Explanation
Gibberellins are tetracyclic diterpene acids. Gibberellic acid is a hormone found in plants and fungi. Its chemical formula is C19H22O6. Answer : (c)
Q.19
Photoperiodism was discovered by ... ... [ AMU 1998]
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a) W. Went
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b) F.F. Blackman
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c) Garner and Allard
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d) F.E. Fritsch
Explanation
In 1920, W. W. Garner and H. A. Allard published their discoveries on photoperiodism and felt it was the length of daylight that was critical, but it was later discovered that the length of the night was the controlling factor. Answer : (c)
Q.20
Match the column ... ... [ kerala 2009]
a) Zeatin
Flowering hormone
b) Florigen
Synthetic auxin
c) IBA
Cytokinin
d) NAA
Natural auxin
0%
a) a - 3, b - 1, c - 4, d - 2
0%
b) a - 4, b - 1, c - 2, d - 3
0%
c) a - 3, b - 4, c - 1, d - 2
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d) a - 2, b - 1. c - 4, d - 3
Explanation
Zeatin is a cytokinin derived from adenine, which occurs in the form of a cis- and a trans-isomer and conjugates. a - 3, Florigen (or flowering hormone) is the hypothesized hormone-like molecule b - 1, IBA (indole-3-butyric acid ) is a natural auxin c - 4, NAA (1-Naphthaleneacetic acid) is a synthetic plant hormone d - 2 Answer : (a)
Q.21
Phytochrome is involved in ... ...[ BHU 1991]
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a) Phototropism
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b) Photorespiration
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c) Photoperiodism
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d) Geotropism
Explanation
Phytochrome is involved in Photoperiodism Answer : (c)
Q.22
Thigmonastic movement is found in ... ... [ Odisha 2007]
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a) Albizzia
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b) Oxalis
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c) Drosera
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d) Nepenthes
Explanation
Drosera, commonly known as the sundews, is one of the largest genera of carnivorous plants, shows Thigmonastic movement due to touch. In Drosera movement is induced by contact of insect hence thigmonastic Answer : (c)
Q.23
Bending of stem towards light is ... ... [ AFMC 1990]
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a) Photoperiodism
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b) Heliotropism
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c) Photonasty
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d) Hydrotropism
Explanation
Heliotropism is the directional growth of a plant in response to sunlight. Answer : (b)
Q.24
Kinetin is ... ... [ AIIMS 1996]
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a) Indolebutyric acid
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b) Indole acetic acid
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c) Butyric acid
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d) 6-furfuryl amino-purine
Explanation
6-furfuryl aminopurine is kinetin a type of cytokinin Answer : (d)
Q.25
Seeds of some plants do not germinate even under favourable conditions due to ... .... [ HPPMT 2007]
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a) Dormancy
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b) Quiescence
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c) Vivipary
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d) Non-viability
Explanation
Dormant seeds are unable to germinate even when the conditions for germination are favorable. Answer : (a)
Q.26
Interfascicular cambium formation is induced by .... ... [ JIPMER 1996]
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a) Auxin
0%
b) Cytokinin
0%
c) Gibberellin
0%
d) Ethylene
Explanation
Interfascicular cambium refers to the cambium arising between the vascular bundles in the stem of a plant, and is derived from embryonic meristems. Auxin induces the lateral meristematic cell division, whereas cytokinin promotes the cell to switch from the meristematic to differentiated state through inhibiting auxin signaling. Answer : (b)
Q.27
r. 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? …[AIPMT 2014]
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a) It supports the hypothesis that IAA is auxin.
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b) It demonstrated polar movement of auxins.
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c) It made possible the isolation and exact identification of auxin.
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d) It is the basis for quantitative determination of small amounts of growth-promoting substances.
Explanation
There are various bioassays to determine the concentration of auxin hormone in the plant. The Avena coleoptile test is a bioassay firstly done by F. W. Went. It is for IAA (indole-3-acetic acid). It measures the angle of curvature of a decapitated coleoptile after placing an agar block containing auxin on one side. It is seen that when coleoptile tips are placed on agar, agar produced bending when placed on one side of a freshly cut coleoptile stumps. This is due to the polar movement of auxin in the stem. Answer:(b)
Q.28
What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows ? …[AIPMT 2015]
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a) Auxin accumulates on the shaded side, stimulating greater cell elongation there.
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b) Green plants need light to perform photosynthesis.
0%
c) Green plants seek light because they are phototropic.
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d) Light stimulates plant cells on the lighted side to grow faster.
Explanation
Auxin accumulates on the shaded side due to which it stimulates cell elongation and enlargement. Its movement is polar and passes from shoot tip to region of elongation. It helps in elongation of both roots and shoots. Auxin(indole 3-acetic acid) also produces tropical responses like phototropism and geotropism. Answer:(a)
Q.29
Which of the following enhances or induces fusion of protoplasts ? …[AIPMT 2015]
0%
a) IAA and gibberellins
0%
b) Sodium chloride and potassium chloride
0%
c) Polyethylene glycol and sodium nitrate
0%
d) IAA and kinetin
Explanation
Somatic fusion, also called protoplast fusion, is a type of genetic modification in plants by which two distinct species of plants are fused together to form a new hybrid plant with the characteristics of both, a somatic hybrid. Several chemicals have been used to induce protoplast fusion. Sodium nitrate (NaN03), polyethylene glycol (PEG), Calcium ions (Ca2+), Polyvinyl alcohol. Chemical fusogens cause the isolated protoplasts to adhere to one another and leads to tight agglutination followed by fusion of protoplast Answer:(c)
Q.30
The Avena curvature is used for bioassay of : …[AIPMT-2016]
0%
a) ABA
0%
b) GA3
0%
c) IAA
0%
d) Ethylene
Explanation
The Avena geo-curvature test is a bioassay for auxin-type growth regulators. IAA (Indole-3-Acetic Acid) is the abundant and well known plant hormone of the auxin class. Answer:(c)
Q.31
During seed germination its stored food is mobilized by …[NEET 2013]
0%
a) Ethylene
0%
b) Cytokinin
0%
c) ABA
0%
d) Gibberellin
Explanation
Gibberellin induces aleurone cells to secrete enzyme to break stored food in seed. Answer:(d)
Q.32
You are given a tissue with its potential for 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 ? …[NEET 2016]
0%
a) Auxin and Abscisic acid
0%
b) Gibberellin and Abscisic acid
0%
c) IAA and gibberellin
0%
d) Auxin and cytokinin
Explanation
Auxin provided by the primary shoot apex suppresses axillary bud growth. Cytokinins, control the growth of stems, roots, and fruits, and convert stems into flowers. Answer:(d)
Q.33
Fruit and leaf drop at early stages can be prevented by the application of ….[NEET- 2017]
0%
a) Cytokinins
0%
b) Ethylene
0%
c) Auxins
0%
d) Gibberellic acid
Explanation
Auxins prevent premature leaf and fruit fall. NAA prevents fruit drop in tomato; 2,4-D prevents fruit drop in Citrus. Answer:(c)
Q.34
Auxin can be bioassayed by : [ ReAIPMT 2015]
0%
a) Lettuce hypocotyl elongation
0%
b) Avena coleoptile curvature
0%
c) Hydroponics
0%
d) Potometer
Explanation
The Avena (oat) coleoptile curvature test for auxin Answer:(b)
Q.35
Match the following:
Column I
Column II
Auxin
a) Bolting in beet
Cytokinin
b) Apical dominance
Gibberellins
c) Breaks seed dormancy
Ethylene
d) Promote nutrient mobilisation
0%
a) 1 → a; 2 → b; 3 → c; 4 → d
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b) 1 → b; 2 → c; 3 → d; 4 → a
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c) 1 → b; 2 → d; 3 → a; 4 → c
0%
d) 1 → d; 2 → b; 3 → a; 4 → c
Explanation
Apical dominance is thought to be caused by the apical bud producing IAA (auxin) in abundance. 1 → b; Cytokinins are plant-specific chemical messengers (hormones) that play a central role in . Morphogenesis of roots, the uptake of minerals, and the movement of nutrients. 2 → d; Bolting is induced by plant hormones of the gibberellin family, and can occur as a result of several factors, including changes in day length, the prevalence of high temperatures at particular stages in a plant's growth cycle, and the existence of stresses such as insufficient water or minerals. 3 → a; Ethylene can stimulate germination and overcome dormancy in many seeds 4 → c Answer:(c)
Q.36
Inhibitor B, abscission II and Dormin are the three kinds of inhibitors which are chemically identical. Identify the hormone?
0%
a) Auxin
0%
b) Abscisic acid
0%
c) Cytokinin
0%
d) Ethylene
Explanation
The three inhibitors which were chemically identical are - inhibitor-B, abscission II and dormin. these were named abscisic acid (ABA) Answer:(b)
Q.37
How many of the following statements are correctly matched: (i) Auxin – cell division – apical dominance – selective weed killer. (ii) Gibberellins – cell elongation – synthesis of α amylase enzyme – terpene derivative. (iii) Cytokinin – cell division – bud formation – delay leaf senescence. (iv) Ethylene – gaseous growth regulator – breaking seed dormancy – respiratory climacteric. (v) Abscisic acid – stress hormone – induce dormancy – leaf abscission. {Question abmitted by Adhithyan js}
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a) 2
0%
b) 3
0%
c) 4
0%
d) 5
Explanation
Answer:(d)
Q.38
The ability of a plant to modify its organ, according to the environment and their life phases is called
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a) Heterophylly.
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b) Differentiation.
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c) Plasticity.
0%
d) Growth phases.
Explanation
Plant plasticity refers to a plant's ability to adapt to and cope with changes in its environment. Heterophylly is a special case of plasticity is represented by heterophylly, the ability of semi-aquatic plants to produce different types of leaves below and above water. Differentiation in plants refers to the processes by which distinct cell types arise from precursor cells and become different from each other. The three phases of cell growth are cell division, cell enlargement and cell differentiation. The first two stages increase the size of the plant cell while the 3rd stage brings maturity to the cells. Answer:(c)
Q.39
With reference to the diagram given below identify the incorrect statement: {Question abmitted by Adhithyan js}
0%
a) It is due to the habitation
0%
b) Shows heterophyllous development due to environment
0%
c) It is also called plasticity.
0%
d) It shows the heterophyllous condition in Buttercups
Explanation
Answer:(d)
Q.40
Development of permanent cells from primary meristematic cells is called: {Question abmitted by Adhithyan js}
0%
a) Plasticity.
0%
b) Differentiation
0%
c) Redifferentiaition.
0%
d) Dedifferentiation
Explanation
During plant cell development cells become specialized for a particular function. This process is called plant cell differentiation. Some of the primary meristematic cells may produce cells that become permanent tissues, e.g. dermal, ground, and primary vascular tissues. The primary meristem, as a meristematic tissue, is comprised of undifferentiated (others, partially differentiated), embryonic cells Answer:(b)
Q.41
Measurement and comparison of total growth per unit time is called: {Question abmitted by Adhithyan js}
0%
a) Absolute growth rate.
0%
b) Relative growth rate.
0%
c) Quantitative growth.
0%
d) Efficiency index.
Explanation
Absolute Growth Rate (AGR), if referred to the size of a plant, represents the increase in its mass per unit of time Answer:(a)
Q.42
Flowering can be inhibited in a biennial plant by: {Question abmitted by Adhithyan js}
0%
a) Exposing to sunlight.
0%
b) Giving additional nutrients.
0%
c) Protecting it from cold.
0%
d) Treatment with auxin.
Explanation
In many plants, temperature has a profound effect on flowering. Some plants do not flower unless they are exposed to prolonged periods of cold temperatures. Biennials remain vegetative during the first season, and after being exposed to the cold temperatures of winter, they flower in spring. Answer:(c)
Q.43
Which of the following is not the character of plant growth? {Question abmitted by Adhithyan js}
0%
a) Indeterminate growth.
0%
b) Measurable growth.
0%
c) Determinate growth.
0%
d) Unlimited growth.
Explanation
Determinate growth definition is - plant growth in which the main stem ends in an inflorescence or other reproductive structure and stops continuing to elongate Answer:(c)
Q.44
The conditions necessary for vernalization are: (i) High temperature and water. (ii) Low temperature and water. (iii) Water and Carbon dioxide. (iv) Oxygen and water.
0%
a) (i), (ii) and (iii)
0%
b)(i) and (ii)
0%
c) (ii) and (iv)
0%
d) (i) and (iii).
Explanation
Answer : (c)
Q.45
Auxins are mainly produced by:
0%
a) Root apical meristem
0%
b) Shoot apical meristem
0%
c) Lateral meristem
0%
d) Intercalary meristem
Explanation
Answer : (b)
Q.46
Find out the correct statements from the following: (i) All cells of plants are descendents of the zygote. (ii) Development is the sum of growth and differentiation. (iii) Growth is regarded as one of the most fundamental and conspicuous characteristics of a living being. (iv) Growth is reversible permanent increase in size of an organ or its parts. {Question abmitted by Adhithyan js}
0%
a) (i) and (ii)
0%
b) (i), (ii) and (iii)
0%
c) (i), (ii) and (iv)
0%
d) (ii) and (iii)
Explanation
Growth is defined as the positive and irreversible change in size and mass over the period of time Statement (iv) is nt correct Answer:(b)
Q.47
IAA is essential in all except: {Question abmitted by Adhithyan js}
0%
a) Apical hook formation.
0%
b) Apical dominance.
0%
c) Parthenocarpy in tomatoes.
0%
d) Xylem differentiation.
Explanation
gibberellins and ethlene are crucial for apical hook formation. Answer:(a)
Q.48
Coconut milk can be used to: {Question abmitted by Adhithyan js}
0%
a) promote root growth and root hair formation.
0%
b) Promote senescence.
0%
c) Induce formation of male flowers.
0%
d) Counteract apical dominance.
Explanation
Coconut milk is the liquid endosperm in unripened fruit and is rich in plant hormone cytokinin. Cytokinin known to regulate axillary bud growth and apical dominance. More cytokinin induces growth of shoot buds Answer:(d)
Q.49
Identify the wrong statement: {Question abmitted by Adhithyan js}
0%
a) The form of growth wherein new cells are always added to the plant body by the activity of meristem is called open form of growth.
0%
b) Secondary growth is observed in dicotyledonous plants and gymnosperms in their later life.
0%
c) One single maize root apical meristem can give rise to more than 17500 new cells per hour.
0%
d) Cells in watermelon may increase in size by upto 35000 times.
Explanation
Cells in a watermelon may increase in size by upto 3,50,000 times. Answer:(d)
Q.50
Which of the following is the measure of growth in pollen tube and a dorsiventral leaf?{Question abmitted by Adhithyan js}
0%
a) Growth of pollen tube is measured in terms of its width and an increase in surface area denotes growth in a dorsiventral leaf.
0%
b) Growth of pollen tube is measured in terms of its length and an increase in surface area denotes growth in a dorsiventral leaf.
0%
c) Growth of pollen tube is measured in terms of its width and an increase in mass to volume ratio denotes growth in a dorsiventral leaf.
0%
d) Growth of pollen tube is measured in terms of its length and an increase in mass to volume ratio denotes growth in a dorsiventral leaf.
Explanation
growth is measureable. Parameters for growth : Growth is measured by a variety of parameters some of which are increase in fresh weight, dry weight, length, area, volume cell and growth in number of cells. For example Growth by increase in the number of the cells : Maize root apical meristem can give rise to more than 17, 500 new cells per hour.Growth in size : Cells of watermelon may increase in size by upto 3,50,000 times. Growth in length : Growth of pollen tube is measured in terms of its length. Growth in surface area : An increase in surface area denotes the growth in a dorsiventral leaf. Answer:(b)
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