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Plant Growth and Development Practice Questions

Class 11 · Biology · 2121 free MCQs with instant results and detailed explanations.

2121
Total
635
Easy
1053
Medium
433
Hard

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Topics in Plant Growth and Development

Differentiation 541
Growth 556
Photoperiodism 518
Plant Hormones 506

Sample Questions from Plant Growth and Development

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
What is the primary factor affecting the rate of plant growth?
A. Water availability
B. Soil texture
C. Light intensity
D. Air quality
Show Answer & Explanation
Correct Answer: C
Light intensity is crucial for photosynthesis, which directly impacts the growth rate of plants.
Q2
Easy
In which phase of growth do plants typically show rapid cell division?
A. Maturation phase
B. Lag phase
C. Exponential phase
D. Decline phase
Show Answer & Explanation
Correct Answer: C
The exponential phase is characterized by rapid cell division and growth as resources are abundant.
Q3
Easy
Which hormone is primarily responsible for promoting cell elongation in plants?
A. Gibberellins
B. Auxins
C. Cytokinins
D. Ethylene
Show Answer & Explanation
Correct Answer: B
Auxins are known to promote cell elongation, which is crucial for plant growth and development.
Q4
Medium
Which hormone is primarily responsible for stimulating stem elongation in plants?
A. Auxin
B. Gibberellin
C. Cytokinins
D. Abscisic Acid
Show Answer & Explanation
Correct Answer: B
Gibberellins are key hormones that promote stem elongation and growth in plants.
Q5
Medium
What is the primary function of auxins in plant growth?
A. Stimulate flowering
B. Promote cell division
C. Regulate fruit ripening
D. Promote elongation of stems
Show Answer & Explanation
Correct Answer: D
Auxins are crucial for the elongation of plant cells, particularly in stems.
Q6
Medium
In which part of the plant does primary growth occur?
A. Roots and leaves
B. Meristematic tissues
C. Xylem and phloem
D. Flowers and fruits
Show Answer & Explanation
Correct Answer: B
Primary growth occurs in meristematic tissues, which are responsible for the increase in length.
Q7
Medium
A plant is exposed to light from one side. What is the growth pattern called?
A. Gravitropism
B. Phototropism
C. Thigmotropism
D. Hydrotropism
Show Answer & Explanation
Correct Answer: B
Phototropism is the growth of a plant in response to light, typically bending towards the light source.
Q8
Hard
Which of the following hormones is primarily responsible for promoting cell elongation in plants?
A. Gibberellins
B. Abscisic Acid
C. Cytokinins
D. Ethylene
Show Answer & Explanation
Correct Answer: A
Gibberellins are a group of plant hormones that promote growth by stimulating cell elongation, especially in stems and leaves.
Q9
Hard
What is the primary function of auxins in plant growth?
A. Promote leaf fall
B. Stimulate root development
C. Inhibit cell division
D. Enhance fruit ripening
Show Answer & Explanation
Correct Answer: B
Auxins are important for stimulating root development and are involved in various growth processes including phototropism.
Q10
Hard
Which of the following substances is known to inhibit plant growth and is often associated with stress responses?
A. Gibberellins
B. Ethylene
C. Abscisic Acid
D. Cytokinins
Show Answer & Explanation
Correct Answer: C
Abscisic Acid (ABA) is a plant hormone that inhibits growth and is involved in the stress response, regulating processes like stomatal closure.

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Plant Growth and Development — Class 11 Biology Practice Questions Online

This page contains 2121 practice MCQs for the chapter Plant Growth and Development in Class 11 Biology. The questions are organized by difficulty — 635 easy, 1053 medium, 433 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.