Do you need some help in preparing for your upcoming Class 11 Biology exam? We’ve compiled a list of MCQ questions on Plant Growth and Development Class 11 MCQs Questions with Answers to get you started with the subject. Practice NCERT MCQ Questions for Class 11 Biology Chapter 15 Plant Growth and Development with Answers Pdf free download, and learn how smart students prepare well ahead MCQ Questions for Class 11 Biology with Answers.
Plant Growth and Development Class 11 MCQs Questions with Answers
Solving Plant Growth and Development Multiple Choice Questions of Class 11 Biology Chapter 15 MCQ can be really beneficial because you will be familiar with all of the topics. These MCQ Questions on Plant Growth and Development Class 11 with answers provide for a quick review of the Chapter, allowing you to have a better understanding of the subject.
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
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
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
Question 4.
Auxins hormone was first discoverd by
(a) Kogletal
(b) Went
(c) Darwin
(d) Boysen Jenson
Answer
Answer: (b) Went
Question 5.
Auxin is synthesised in the apical meristems from amino acid
(a) Isoleucine
(b) Methionine
(c) Niacin
(d) Tryptophan
Answer
Answer: (d) Tryptophan
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
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
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.
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
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
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
Question 12.
Cytokinins are in nature
(a) Acidic
(b) Neutral
(c) Basic
(d) All of these
Answer
Answer: (c) Basic
Question 13.
Cytokinins help in promoting
(a) Cell division
(b) Stem elongation
(c) Cell enlargement
(d) Parthenocarpy
Answer
Answer: (a) Cell division
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
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
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
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
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
Question 19.
The cold induced stimulus used in vernalization is
(a) Vernalin
(b) Carotene
(c) Ethylene
(d) Florigen
Answer
Answer: (a) Vemalin
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
Question 21.
W’hich is a long day plant
(a) Xanthium
(b) Wheat
(c) Soyabean
(d) Tobacco
Answer
Answer: (b) Wheat
Question 22.
Which can replace the requirement of vernalisation
(a) Gibberellins
(b) Auxin
(c) Cytokinin
(d) Ethylene
Answer
Answer: (a) Gibberellins
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
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
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
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
Question 2.
Plant growth is ……………. because plants retain die capacity for unlimited growth throughout their life.
Answer
Answer: Unique
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
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
Question 5.
The period of growth is generally divided into three phases, namely, ……………, ………….. and …………….
Answer
Answer: meristematic, elongation, maturation
Question 6.
The increased growth per unit time is termed as ……………
Answer
Answer: growth rate
Question 7.
In arithmetic growth, following ………….. cell division, only one ………….. continues to divide while the other differentiates and matures.
Answer
Answer: mitoic, daughter cell
Question 8.
Measurement and comparison of total growth per unit time is called the …………….
Answer
Answer: absolute growth rate
Question 9.
The growth of the given system per unit initial parameter is called the ……………..
Answer
Answer: relative growth rate
Question 10.
………….. helps in releasing metabolic energy essential for growth activities.
Answer
Answer: Oxygen
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
Question 12.
…………., ………. and …………….. are very closely related events in the life of a plant.
Answer
Answer: Growth, differentiation, development
Question 13.
The plant growth regulators are …………., …………….. of diverse chemical composition.
Answer
Answer: small, simple molecules
Question 14.
……………. is used to speed up the malting process in brewing industry.
Answer
Answer: GA3
Question 15.
…………… is highly effective in fruit ripening.
Answer
Answer: Ethylene
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
Question 2.
Abscisic acid (ABA) was discovered for its, role in regulating abscission and dormancy.
Answer
Answer: True
Question 3.
The former group of plants are long day plants while the later ones are termed short day plants.
Answer
Answer: False
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
Question 5.
Biennials are monocarpic plants that normally flower and die in the second season.
Answer
Answer: True
Question 6.
Vernalisation refers specially to the promotion of flowering by a period of low temperatures.
Answer
Answer: True
Question 7.
Environmental signals such as light and gravity also affect certain phases/stages of growth.
Answer
Answer: True
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
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
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
Question 11.
Development is the sum of two processes: growth and differentiation.
Answer
Answer: True
Question 12.
AH plant organs are made up of a variety of tissues.
Answer
Answer: True
Question 13.
The plant cells grow in size by cell enlargement which in turn requires water.
Answer
Answer: True
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
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
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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