Last Updated on September 27, 2025 by XAM CONTENT
To succeed in Class 11 Biology exams, a strong grasp of Chapter 13 – Plant Growth and Development is essential. Our comprehensive collection of chapterwise MCQ questions with answers for Class 11 Biology is designed according to the latest syllabus and exam guidelines, ensuring targeted preparation and better performance. It is a part of MCQ Questions for CBSE Class 11 Biology Series.
These multiple-choice questions will help you assess your knowledge, improve accuracy, and boost confidence for your exams. Whether you are preparing for school tests, online tests or competitive exams, these Plant Growth and Development MCQs will strengthen your conceptual clarity.
| Chapter | Plant Growth and Development |
| Book | Biology for Class 11 |
| Type of Questions | MCQ Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 11 |
| Subject | Biology |
| Useful for | Class 11 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 11 Biology Chapterwise MCQ Questions |
MCQ Questions on Plant Growth and Development Class 11 Biology (PDF Download)
Question 1.
Which phase of growth is characterized by maximum metabolic activity?
(a) Lag phase
(b) Log phase
(c) Stationary phase
(d) Senescence phase
Show Answer
Answer: (b) Log phase
Explanation: During the log (exponential) phase, cells divide rapidly and metabolic activities are at their peak, leading to maximum growth rate.
Question 2.
Which hormone is mainly responsible for cell elongation in plants?
(a) Auxin
(b) Cytokinin
(c) Gibberellin
(d) Ethylene
Show Answer
Answer: (a) Auxin
Explanation: Auxins promote cell wall loosening and elongation by increasing plasticity of cell walls, especially in stems.
Question 3.
Bolting in rosette plants like cabbage is induced by:
(a) Auxins
(b) Gibberellins
(c) Cytokinins
(d) Ethylene
Show Answer
Answer: (b) Gibberellins
Explanation: Gibberellins stimulate stem elongation, leading to bolting in rosette plants before flowering.
Question 4.
Which plant hormone is known as the “stress hormone”?
(a) Auxin
(b) Cytokinin
(c) Abscisic acid
(d) Gibberellin
Show Answer
Answer: (c) Abscisic acid
Explanation: Abscisic acid (ABA) induces dormancy, closes stomata during stress, and helps plants tolerate drought conditions.
Question 5.
Which process in plants is promoted by cytokinins?
(a) Cell division
(b) Cell elongation
(c) Dormancy
(d) Leaf abscission
Show Answer
Answer: (a) Cell division
Explanation: Cytokinins stimulate cytokinesis and promote cell division, delaying leaf senescence.
Question 6.
Which pigment controls photoperiodism in plants?
(a) Chlorophyll
(b) Carotenoid
(c) Phytochrome
(d) Anthocyanin
Show Answer
Answer: (c) Phytochrome
Explanation: Phytochrome detects red and far-red light and regulates photoperiodic flowering in plants.
Question 7.
Vernalization refers to:
(a) Effect of light on flowering
(b) Effect of low temperature on flowering
(c) Effect of hormones on seed dormancy
(d) Effect of photoperiod on leaf fall
Show Answer
Answer: (b) Effect of low temperature on flowering
Explanation: Vernalization is the induction of flowering by prolonged exposure to low temperature, common in biennial plants.
Question 8.
Which of the following hormones is a gas?
(a) Auxin
(b) Ethylene
(c) Cytokinin
(d) Gibberellin
Show Answer
Answer: (b) Ethylene
Explanation: Ethylene is a gaseous hormone that regulates fruit ripening, senescence, and abscission.
Question 9.
The climacteric rise in respiration is associated with:
(a) Leaf senescence
(b) Fruit ripening
(c) Flowering
(d) Dormancy
Show Answer
Answer: (b) Fruit ripening
Explanation: Ethylene induces a sudden increase in respiration called the climacteric effect, which is linked with ripening of climacteric fruits like bananas and tomatoes.
Question 10.
Which hormone breaks seed dormancy and promotes germination?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) ABA
Show Answer
Answer: (b) Gibberellin
Explanation: Gibberellins break seed dormancy by stimulating enzymes like amylase that mobilize stored food for germination.
Question 11.
Apical dominance in plants is caused by:
(a) Auxins
(b) Cytokinins
(c) Gibberellins
(d) Ethylene
Show Answer
Answer: (a) Auxins
Explanation: Auxins produced in the apical bud suppress the growth of lateral buds, a phenomenon called apical dominance.
Question 12.
Which hormone promotes senescence and abscission?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Ethylene
Show Answer
Answer: (d) Ethylene
Explanation: Ethylene accelerates fruit ripening, leaf senescence, and abscission.
Question 13.
Short-day plants require photoperiods:
(a) Longer than critical day length
(b) Shorter than critical day length
(c) Equal to 12 hours
(d) Independent of light
Show Answer
Answer: (b) Shorter than critical day length
Explanation: Short-day plants flower when the photoperiod is shorter than their critical day length, e.g., soybean and chrysanthemum.
Question 14.
Which hormone is used commercially to induce parthenocarpy in tomatoes?
(a) Cytokinin
(b) Auxin
(c) Gibberellin
(d) ABA
Show Answer
Answer: (b) Auxin
Explanation: Auxins are applied to induce fruit formation without fertilization, leading to parthenocarpic seedless fruits.
Question 15.
Which is the site of perception of photoperiod for induction of flowering in plants?
(a) Flowers
(b) Leaves
(c) Stem
(d) Roots
Show Answer
Answer: (b) Leaves
Explanation: Leaves perceive photoperiodic signals through phytochrome and send chemical signals (florigen) to apical meristems to induce flowering.
Question 16.
Which hormone is responsible for promoting flowering in pineapple (synchronous flowering)?
(a) Cytokinin
(b) Gibberellin
(c) Auxin
(d) Ethylene
Show Answer
Answer: (d) Ethylene
Explanation: Ethylene is used commercially to induce synchronous flowering and fruiting in pineapple plants.
Question 17.
Which enzyme is activated by gibberellins during seed germination to mobilize food reserves?
(a) Amylase
(b) Lipase
(c) Protease
(d) Invertase
Show Answer
Answer: (a) Amylase
Explanation: Gibberellins induce synthesis of hydrolytic enzymes like amylase in the aleurone layer, breaking down starch into sugars for seedling growth.
Question 18.
Which hormone antagonizes the effects of gibberellins and auxins?
(a) Cytokinin
(b) ABA
(c) Ethylene
(d) Florigen
Show Answer
Answer: (b) ABA
Explanation: Abscisic acid induces dormancy, closes stomata, and inhibits processes like germination and growth promoted by GA and auxins.
Question 19.
Florigen, the flowering hormone, is believed to be:
(a) Auxin
(b) Cytokinin
(c) A hypothetical universal hormone
(d) Ethylene
Show Answer
Answer: (c) A hypothetical universal hormone
Explanation: Florigen is a hypothetical signal produced in leaves under specific photoperiods that induces flowering at the shoot apex.
Question 20.
Dedifferentiation in plants refers to:
(a) Conversion of permanent tissue into meristematic tissue
(b) Conversion of meristematic tissue into permanent tissue
(c) Aging of tissues
(d) Death of cells
Show Answer
Answer: (a) Conversion of permanent tissue into meristematic tissue
Explanation: Dedifferentiation is when differentiated permanent cells regain the capacity to divide, forming meristematic tissue again (e.g., cork cambium).
We hope the given mcq questions with Answers for Plant Growth and Development Class 11 helps you in your learning.
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Topics from which mcq questions may be asked
- Growth hormones
- Photoperiodism
- Plant growth stages
Plant growth is guided by hormones, environment, and internal cues.
Frequently Asked Questions (FAQs) on Plant Growth and Development MCQ Questions
Q1: What is the best way to prepare for Class 11 Biology MCQ questions?
A1: The best way is to study NCERT concepts thoroughly, practice topicwise MCQs regularly. Solving previous year MCQs and mock tests can boost accuracy and speed.
Q2: Are NCERT questions enough for Class 11 Biology MCQ-based exams?
A2: NCERT forms the base for all CBSE Physics MCQs. However, for better preparation, students should solve additional MCQs from reference books and practice HOTS and competency-based questions to develop better understanding.
Q3: Where can I find chapterwise Class 11 Biology MCQ questions with answers?
A3: You can find chapterwise MCQ questions with answers and detailed explanations on trusted educational platforms like xamcontent.com and physicsgurukul.com. These cover both basic and advanced-level questions.
Q4: Do CBSE Class 11 exams include MCQs?
A4: Yes, as per the latest CBSE exam pattern, objective questions, including MCQs, are part of the final exam paper. MCQs test conceptual understanding and application skills.
Q5: How to score high in Class 11 Biology MCQs?
A5: To score high, understand the theory from NCERT, solve a variety of MCQs (basic and conceptual), and regularly revise theory. Avoid guesswork and focus on time management during tests.
