Plant growth and development
NCERT solutions for Class 11 Biology
NCERT Class 11 Biology Chapter wise Solutions
UNIT I: DIVERSITY IN THE LIVING WORLD
- 1 : The Living World
- 2 : Biological Classification
- 3 : Plant Kingdom
- 4 : Animal Kingdom
UNIT II: STRUCTURAL ORGANISATION IN PLANTS AND ANIMALS
- 5 : Morphology of Flowering Plants
- 6 : Anatomy of Flowering Plants
- 7 : Structural Organisation in Animals
UNIT III: CELL: STRUCTURE AND FUNCTIONS
- 8 : Cell : The Unit of Life
- 9 : Biomolecules
- 10 : Cell Cycle and Cell Division
UNIT IV: PLANT PHYSIOLOGY
- 11 : Transport in Plants
- 12 : Mineral Nutrition
- 13 : Photosynthesis in Higher Plants
- 14 : Respiration in Plants
- 15 : Plant Growth and Development
UNIT V: HUMAN PHYSIOLOGY
- 16 : Digestion and Absorption
- 17 : Breathing and Exchange of Gases
- 18 : Body Fluids and Circulation
- 19 : Excretory Products and their Elimination
- 20 : Locomotion and Movement
- 21 : Neural Control and Coordination
- 22 : Chemical Coordination and Integration
NCERT Solutions For Class 11 Biology Chapter 15 Plant growth and development
- 15.1 Growth
- 15.2 Differentiation, Dedifferentiation and Redifferentiation
- 15.3 Development
- 15.4 Plant Growth Regulators
- 15.5 Photoperiodism
- 15.6 Vernalisation
NCERT Solutions For Class 11 Biology Plant growth and development
1. Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.
2. Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?
3. Describe briefly:
(a) Arithmetic growth
(b) Geometric growth
(c) Sigmoid growth curve
(d) Absolute and relative growth rates
4. List five main groups of natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/horticultural applications of any one of them.
5. What do you understand by photoperiodism and vernalisation? Describe their significance.
6. Why is abscisic acid also known as stress hormone?
7. ‘Both growth and differentiation in higher plants are open’. Comment.
8. ‘Both a short day plant and a long day plant can produce can flower simultaneously in a given place’. Explain.
9. Which one of the plant growth regulators would you use if you are asked to:
10. Would a defoliated plant respond to photoperiodic cycle? Why?
11. What would be expected to happen if:
(a) $GA_3$ is applied to rice seedlings
(b) dividing cells stop differentiating
(c) a rotten fruit gets mixed with unripe fruits
(d) you forget to add cytokinin to the culture medium.