Plant Growth and Development
ICSE · Class 11 · Biology
Most important questions from Plant Growth and Development for ICSE Class 11 Biology board exam 2026. MCQs, short answer, and long answer questions with marks.
Interactive on Super Tutor
Studying Plant Growth and Development? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for important questions and more.
1,000+ Class 11 students started this chapter today
This is just one of 10+ visuals inside Super Tutor's Plant Growth and Development chapter
Explore the full setSample Questions
Which disease in rice led to the discovery of gibberellins?
Show answer
Bakanae (foolish seedling) disease
Bakanae (foolish seedling disease) caused by Gibberella fujikuroi led to the discovery of gibberellins. E. Kurosawa (1926) found that infected seedlings showed hyperelongation due to a substance secreted by this fungus.
The most active naturally occurring cytokinin is:
Show answer
Zeatin
Zeatin is the most active naturally occurring cytokinin, isolated from the endosperm of corn (Zea mays) by Letham and Miller in 1964. Kinetin is the first cytokinin discovered but is synthetic (from herring sperm DNA).
ABA is also known as:
Show answer
Stress hormone
ABA (Abscisic Acid) is called the stress hormone because it mediates plant responses to various stresses — especially water stress (drought), where it promotes stomatal closure to reduce water loss.
Ethylene is the only plant hormone that is:
Show answer
A gas at room temperature
Ethylene (C₂H₄) is the only gaseous plant hormone. It is an unsaturated hydrocarbon that can easily diffuse inside the plant through intercellular spaces. Its chemical formula is C₂H₄.
+56 more questions available
Practice AllFrequently Asked Questions
What are the important topics in Plant Growth and Development for ICSE Class 11 Biology?
How to score full marks in Plant Growth and Development — ICSE Class 11 Biology?
How many important questions are there in Plant Growth and Development?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Plant Growth and Development
Practice Quiz
Test yourself with a quick quiz
Revision Notes
Key points for last-minute revision
Formula Sheet
All formulas in one place
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect visually
Study Plan
Step-by-step plan to ace this chapter
Flashcards
Quick-fire cards for active recall
Syllabus
What topics to cover
NCERT Solutions
Every textbook question solved step by step
For serious students
Get the full Plant Growth and Development chapter — for free.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for ICSE Class 11 Biology.