Solving the Plant Growth and Development Multiple Choice Questions of Class 11 Biology Chapter 15 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Plant Growth and Development Class 11 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 15 Biology Class 11 and cross-check your answers during preparation.

I. Select the correct answer from the following questions:

Question 1.
Three important growth promotor hormones in plants are
(a) Auxins, gibberellins and ethylene
(b) Auxins, gibberellins and cytokinins
(c) Ethylene, abscisic acid and cytokinins
(d) Gibberellins, cytokinins and abscisic acid

Answer

Answer: (b) Auxins, gibberellins and cytokinins

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Question 2.
First hormone isolated from human urine suffering from pellagra disease was
(a) Gibberelins
(b) Auxins
(c) Cytokinins
(d) Abscisic acid

Answer

Answer: (b) Auxins

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Question 3.
Indole 3 acetic acid (IAA) is a naturally occuring plant hormone called
(a) Gibberellins
(b) Auxins
(c) Cytokinins
(d) Abscisic acid

Answer

Answer: (b) Auxins

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Question 4.
Auxins hormone was first discoverd by
(a) Kogletal
(b) Went
(c) Darwin
(d) Boysen Jenson

Answer

Answer: (b) Went

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Question 5.
Auxin is synthesised in the apical meristems from amino acid
(a) Isoleucine
(b) Methionine
(c) Niacin
(d) Tryptophan

Answer

Answer: (d) Tryptophan

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Question 6.
Growth regulator which is known to promote cell division in vascular cambium is
(a) IAA
(b) ABA
(c) Cytokinins
(d) Ethylene

Answer

Answer: (a) IAA

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Question 7.
Growth regultor which is known to induce parthenocarphy is plants is called
(a) Gibberellins
(b) ABA
(c) Ethylene
(d) Cytokinins

Answer

Answer: (a) Gibberellins

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Question 8.
The formation of seedless fruits without the act of fertilization is known as
(a) Parthenocarpy
(b) Pseudocarpy
(c) Apomixis
(d) Parthenogenesis

Answer

Answer: (a) Parthenocarpy.

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Question 9.
The major sites of gibberellin production in plants are
(a) Embryos
(b) Roots
(c) Young leaves
(d) All of these

Answer

Answer: (d) All of these

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Question 10.
Gibberellin was isolated in pure form by
(a) Brian et al
(b) Went
(c) Yabuta
(d) Kurosava

Answer

Answer: (a) Brian et al

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Question 11.
Internodal elongation of genetically dwarf plants in known as
(a) Bolting
(b) Elongation
(c) Etiolation
(d) None of these

Answer

Answer: (a) Bolting

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Question 12.
Cytokinins are in nature
(a) Acidic
(b) Neutral
(c) Basic
(d) All of these

Answer

Answer: (c) Basic

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Question 13.
Cytokinins help in promoting
(a) Cell division
(b) Stem elongation
(c) Cell enlargement
(d) Parthenocarpy

Answer

Answer: (a) Cell division

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Question 14.
The first natural cytokinins obtained from unripe maize grains is known as
(a) Indole 3-acetic acid
(b) ABA
(c) Zeatin
(d) Kinetin

Answer

Answer: (c) Zeatin

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Question 15.
Two important growth inhibitors in plants are
(a) Ethylene and abscisic acid
(b) Auxins and abscisic acid
(c) Gibberellins and abscisic acid
(d) Cytokinins and ethylene

Answer

Answer: (a) Ethylene and abscisic acid

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Question 16.
Name the plant hormone which hastens ripening of fruits and colour development is citrus, apple, mango, banana, etc.
(a) Gibberellin
(b) Ethylene
(c) ABA
(d) IAA

Answer

Answer: (b) Ethylene

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Question 17.
Abscisic acid (ABA) was first isolated from cotton balls by
(a) Addicot et al
(b) Letham et al
(c) Brian et al
(d) Kurosava

Answer

Answer: (a) Addicot et al

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Question 18.
Seeds which are influenced by light for germination are known as
(a) Neoblastic
(b) Hoioblastic
(c) Photoblastic
(d) All of these

Answer

Answer: (c) Photoblastic

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Question 19.
The cold induced stimulus used in vernalization is
(a) Vernalin
(b) Carotene
(c) Ethylene
(d) Florigen

Answer

Answer: (a) Vemalin

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Question 20.
When dark period of short day plants is interrupted by a brief exposure to light the plant will-
(a) flower immediately
(b) give more flowers
(c) not flower at all
(d) change into long day plant

Answer

Answer: (c) Not flower at all

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Question 21.
W’hich is a long day plant
(a) Xanthium
(b) Wheat
(c) Soyabean
(d) Tobacco

Answer

Answer: (b) Wheat

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Question 22.
Which can replace the requirement of vernalisation
(a) Gibberellins
(b) Auxin
(c) Cytokinin
(d) Ethylene

Answer

Answer: (a) Gibberellins

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Question 23.
Artificial ripening of fruit of accomplished by treatment with
(a) Zeatin
(b) NaCl
(c) IAA
(d) Ethylene gas

Answer

Answer: (d) Ethylene gas

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Question 24.
Which is a short day plant?
(a) Glycine max
(b) Triticum aestivum
(c) Raphanus sativus
(d) Daucus carota

Answer

Answer: (a) Glycine max

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Question 25.
The period of growth is generally divided into
(a) Meristematic phase
(b) Elongation phase
(c) Maturation phase
(d) All of these phases

Answer

Answer: (d) All of these phases

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II. Fill in the blanks:

Question 1.
…………. is regarded as one of the most fundamental and conspicuous characteristics of a living being.

Answer

Answer: Growth

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Question 2.
Plant growth is ……………. because plants retain die capacity for unlimited growth throughout their life.

Answer

Answer: Unique

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Question 3.
This form of growth wherein new cells are always being added to the plant body by the activity of the meristem is called the …………….

Answer

Answer: open form of growth

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Question 4.
Growth is, therefore, measured by a variety of parameters some o,r which are ……………… dry weight; length; area volume and cell number.

Answer

Answer: increase in fresh weight

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Question 5.
The period of growth is generally divided into three phases, namely, ……………, ………….. and …………….

Answer

Answer: meristematic, elongation, maturation

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Question 6.
The increased growth per unit time is termed as ……………

Answer

Answer: growth rate

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Question 7.
In arithmetic growth, following ………….. cell division, only one ………….. continues to divide while the other differentiates and matures.

Answer

Answer: mitoic, daughter cell

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Question 8.
Measurement and comparison of total growth per unit time is called the …………….

Answer

Answer: absolute growth rate

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Question 9.
The growth of the given system per unit initial parameter is called the ……………..

Answer

Answer: relative growth rate

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Question 10.
………….. helps in releasing metabolic energy essential for growth activities.

Answer

Answer: Oxygen

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Question 11.
…………….. is a term that includes all changes that an organism goes through during its life cycle from germination of the seed to senescence.

Answer

Answer: Development

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Question 12.
…………., ………. and …………….. are very closely related events in the life of a plant.

Answer

Answer: Growth, differentiation, development

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Question 13.
The plant growth regulators are …………., …………….. of diverse chemical composition.

Answer

Answer: small, simple molecules

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Question 14.
……………. is used to speed up the malting process in brewing industry.

Answer

Answer: GA₃

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Question 15.
…………… is highly effective in fruit ripening.

Answer

Answer: Ethylene

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III. Mark the statement True (T) or False (F):

Question 1.
Ethylene also promotes root growth and root hair formation, thus helping the plants to increase their absorption surface.

Answer

Answer: True

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Question 2.
Abscisic acid (ABA) was discovered for its, role in regulating abscission and dormancy.

Answer

Answer: True

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Question 3.
The former group of plants are long day plants while the later ones are termed short day plants.

Answer

Answer: False

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Question 4.
Flowering in certain plants depends not only on a combination of light and dark exposures but also their relative durations. This is termed photoperiodism.

Answer

Answer: True

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Question 5.
Biennials are monocarpic plants that normally flower and die in the second season.

Answer

Answer: True

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Question 6.
Vernalisation refers specially to the promotion of flowering by a period of low temperatures.

Answer

Answer: True

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Question 7.
Environmental signals such as light and gravity also affect certain phases/stages of growth.

Answer

Answer: True

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Question 8.
An S-shaped curve is a characteristic of the living organism growing in a natural environment. It is typical for all cells, tissues and organs of a plant.

Answer

Answer: True

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Question 9.
In arithmetic growth, following mitoic cell division, only one daughter cell continues to divide while the other differentiates and matures.

Answer

Answer: True

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Question 10.
Wherein new cells are always being added to the plant body by the activity of the meristem is called the close form of growth.

Answer

Answer: False

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Question 11.
Development is the sum of two processes: growth and differentiation.

Answer

Answer: True

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Question 12.
AH plant organs are made up of a variety of tissues.

Answer

Answer: True

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Question 13.
The plant cells grow in size by cell enlargement which in turn requires water.

Answer

Answer: True

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Question 14.
Cells positioned away from shoot apical meristems differentiate as shoot-cap cells, while those pushed to the periphery mature as epidermis

Answer

Answer: False

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Question 15.
PGRs could be indole compounds (indole-3-acetic acid, IAA); adenine derivatives (N6- furfurylamino purine, kinetin), derivatives of carotenoids and fatty acids (abscisic acid, ABA); terpenes (gibberellic acid, GA₃) or gases (ethylene, C₂H₄)

Answer

Answer: True

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IV. Match the items of column I with the items of column II

Column I	Column II
(a) Terpenes	1. for example, root apices, developing shoot buds, young fruits etc.
(b) Plant growth promoters e.g.,	2. a phenomenon called apical dominance.
(c) This ability is called plasticity e.g.	3. malting process in brewing industry.
(d) The ‘bakane’, (foolish seedling) a disease or rice seedling was caused by	4. gibberellic acid, GA3
(e) Skoog and Miller	5. Kinetin
(f) Auxins, like IAA and indole butyric acid (IBA) have been	6. heterophylly in cotton, coriander and darkspur.
(g) In most higher plants, the growing apical bud inhibits the growth of lateral (axillary) buds,	7. auxins, gibberellins and cytokinins.
(h) GA3 is used to speed up the	8. isolated from plant.
(i) Natural cytokinins	9. a fungal pathogen Gibberalla fujikuroi
(j) ABA stimulates the closure of stomata in the epidermis and in-creases the tolerance of plants to various kinds of stresses.	10. Stress hormone.
(k) Short day plant	11. Vernalisation
(l) Long day plant	12. Those plants which flower when the day length is more than a critical photoperiod.
(m) The chilling treatment given to shoot tips or seeds is called	13. in biennial plants
(n) Example of vernalistion is seen	14. Those plants which flower when the day length is less than a critical photoperiod.
(o) Flowering in certain plants depends not only on a combination of light and dark exposures	15. but also their relative durations. This is termed photoperiodism.

Answer

Answer:

Column I	Column II
(a) Terpenes	4. gibberellic acid, GA3
(b) Plant growth promoters e.g.,	7. auxins, gibberellins and cytokinins.
(c) This ability is called plasticity e.g.	6. heterophylly in cotton, coriander and darkspur.
(d) The ‘bakane’, (foolish seedling) a disease or rice seedling was caused by	9. a fungal pathogen Gibberalla fujikuroi
(e) Skoog and Miller	5. Kinetin
(f) Auxins, like IAA and indole butyric acid (IBA) have been	8. isolated from plant.
(g) In most higher plants, the growing apical bud inhibits the growth of lateral (axillary) buds,	2. a phenomenon called apical dominance.
(h) GA3 is used to speed up the	3. malting process in brewing industry.
(i) Natural cytokinins	1. for example, root apices, developing shoot buds, young fruits etc.
(j) ABA stimulates the closure of stomata in the epidermis and in-creases the tolerance of plants to various kinds of stresses.	10. Stress hormone.
(k) Short day plant	14. Those plants which flower when the day length is less than a critical photoperiod.
(l) Long day plant	12. Those plants which flower when the day length is more than a critical photoperiod.
(m) The chilling treatment given to shoot tips or seeds is called	11. Vernalisation
(n) Example of vernalistion is seen	13. in biennial plants
(o) Flowering in certain plants depends not only on a combination of light and dark exposures	15. but also their relative durations. This is termed photoperiodism.

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