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Class 11 Biology — Chapter 13: Plant Growth and Development
60 practice questions · 20 Easy · 20 Medium · 20 Hard
Free NCERT-aligned multiple-choice practice for Class 11 Biology, Chapter 13 (Plant Growth and Development). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 60.
Sample questions
Q1Easy
Auxin promotes:
A.Cell elongation and apical dominance✓ correct
B.Senescence
C.Stomatal closure
D.Dormancy
Why
IAA — discovered via phototropism studies.
Q2Medium
Sigmoid (S-shaped) growth curve has:
A.Lag, log (exponential), stationary phases✓ correct
B.Only one phase
C.Two phases
D.No pattern
Why
Classic three-phase growth curve.
Q3Hard
Photoperiodism affects:
A.Flowering response to day length✓ correct
B.Photosynthesis rate
C.Root colour
D.Soil pH
Why
Long-day vs short-day plants.
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