Class 11 Biology MCQ Chapter 13 Plant Growth and Development
Looking for Class 11 Biology MCQ Chapter 13 Plant Growth and Development English Medium? You have come to the right place. This article provides important multiple-choice questions (MCQs) with answers to help AHSEC Higher Secondary First Year students revise the chapter and prepare effectively for examinations.
The chapter Plant Growth and Development explains how plants grow and develop throughout their life cycle. Students will learn about plant growth, growth phases, growth regulators, plant hormones, seed germination, dormancy, photoperiodism, vernalization, and various factors that influence plant development. These topics are important for understanding the life processes of plants and are often included in examination questions.
The MCQs included here are based on the latest AHSEC syllabus and examination pattern. They are designed to help students practice important concepts, improve their understanding, and evaluate their preparation level before exams. Regular practice of these questions can make revision more effective and increase confidence.
Whether you are preparing for class tests, annual examinations, or the AHSEC HS First Year Examination, these MCQ solutions will help you build a strong understanding of the chapter and score better marks in Biology.
Unit IV. Plant Physiology
Plant Growth and Development
VSA & MCQ
I. Short Answer Questions (1 Mark Each)
Q1. What is growth in plants?
Ans: It is a permanent and irreversible increase in size, volume or dry weight.
Q2. What is differentiation?
Ans: It is the process by which cells become structurally and functionally specialised.
Q3. What is development?
Ans: It includes all changes such as growth, differentiation and maturation in a plant.
Q4. What is dedifferentiation?
Ans: It is the process by which mature cells regain the ability to divide.
Q5. What is redifferentiation?
Ans: It is the process by which dedifferentiated cells become specialised again.
Q6. What is a meristem?
Ans: A group of actively dividing cells responsible for plant growth.
Q7. What is determinate growth?
Ans: Growth that stops after reaching a certain stage.
Q8. What is growth rate?
Ans: Increase in growth per unit time.
Q9. What is arithmetic growth?
Ans: Growth at a constant rate where only one daughter cell divides.
Q10. What is geometric growth?
Ans: Growth where all cells divide leading to exponential increase.
Q11. What is sigmoid growth curve?
Ans: An S-shaped growth curve with lag, log and stationary phases.
Q12. What are plant growth regulators?
Ans: Chemical substances that control growth and development in plants.
Q13. Name any two plant growth regulators.
Ans: Auxin and Gibberellin.
Q14. What is the function of ethylene?
Ans: It promotes fruit ripening.
Q15. Why is abscisic acid called stress hormone?
Ans: Because it helps plants withstand stress conditions like drought.
II. Multiple Choice Questions (MCQs)
Q1. Growth in plants is
(a) Temporary
(b) Reversible
(c) Permanent
(d) None
Ans: (c)
Q2. Differentiation results in
(a) Cell division
(b) Specialisation
(c) Death
(d) Enlargement
Ans: (b)
Q3. Meristematic cells are
(a) Dead
(b) Dividing
(c) Non-living
(d) Fixed
Ans: (b)
Q4. Determinate growth occurs in
(a) Roots
(b) Leaves
(c) Meristems
(d) Stem tips
Ans: (b)
Q5. Arithmetic growth produces a
(a) S-curve
(b) J-curve
(c) Linear curve
(d) Zig-zag curve
Ans: (c)
Q6. Geometric growth produces a
(a) Linear curve
(b) J-shaped curve
(c) Circular curve
(d) Flat curve
Ans: (b)
Q7. Sigmoid curve is
(a) Straight
(b) S-shaped
(c) J-shaped
(d) Circular
Ans: (b)
Q8. Growth rate is measured as
(a) Time
(b) Increase per unit time
(c) Volume
(d) Weight
Ans: (b)
Q9. Auxins promote
(a) Root growth
(b) Leaf fall
(c) Dormancy
(d) Senescence
Ans: (a)
Q10. Gibberellins help in
(a) Fruit ripening
(b) Stem elongation
(c) Leaf fall
(d) Dormancy
Ans: (b)
Q11. Cytokinins promote
(a) Senescence
(b) Cell division
(c) Dormancy
(d) Abscission
Ans: (b)
Q12. Ethylene is a
(a) Liquid
(b) Solid
(c) Gas
(d) Protein
Ans: (c)
Q13. Ethylene promotes
(a) Rooting
(b) Ripening
(c) Dormancy
(d) Growth inhibition
Ans: (b)
Q14. Abscisic acid induces
(a) Growth
(b) Dormancy
(c) Cell division
(d) Elongation
Ans: (b)
Q15. Dedifferentiation means
(a) Cell death
(b) Loss of division
(c) Regaining division
(d) Enlargement
Ans: (c)
Q16. Redifferentiation leads to
(a) Division
(b) Specialisation
(c) Death
(d) Growth
Ans: (b)
Q17. Growth regulators are
(a) Enzymes
(b) Hormones
(c) Proteins
(d) Minerals
Ans: (b)
Q18. Bolting is induced by
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) ABA
Ans: (b)
Q19. Senescence is delayed by
(a) Auxin
(b) Cytokinin
(c) Ethylene
(d) ABA
Ans: (b)
Q20. Rooting in cuttings is induced by
(a) Auxin
(b) Ethylene
(c) ABA
(d) Gibberellin
Ans: (a)
Q21. Stomatal closure is induced by
(a) Auxin
(b) Ethylene
(c) ABA
(d) Cytokinin
Ans: (c)
Q22. Photoperiod is perceived by
(a) Roots
(b) Leaves
(c) Stem
(d) Flowers
Ans: (b)
Q23. Development includes
(a) Growth only
(b) Differentiation only
(c) Both growth and differentiation
(d) None
Ans: (c)
Q24. Relative growth rate depends on
(a) Initial size
(b) Final size
(c) Time only
(d) Weight only
Ans: (a)
Q25. Absolute growth rate depends on
(a) Increase per time
(b) Initial size
(c) Shape
(d) Colour
Ans: (a)
Q26. Growth is
(a) Reversible
(b) Irreversible
(c) Temporary
(d) None
Ans: (b)
Q27. Auxin helps in
(a) Apical dominance
(b) Ripening
(c) Dormancy
(d) Abscission
Ans: (a)
Q28. Cytokinins are produced mainly in
(a) Leaves
(b) Roots
(c) Stem
(d) Flowers
Ans: (b)
Q29. ABA is mainly involved in
(a) Growth promotion
(b) Stress response
(c) Elongation
(d) Division
Ans: (b)
Q30. Plant growth is influenced by
(a) Internal factors
(b) External factors
(c) Both
(d) None
Ans: (c)
