Growth and Development in Plants : 12th Class Biology Question Answer Lesson 20 – NIOS

INTEXT QUESTIONS 20.1
- Distinguish between growth and development.
Ans. Growth : Increase in number and size of a cell, organ organism.
Development : Series of qualitative & quantitative changes including
growth, differentiation and maturation. - What is differentiation?
Ans. Process of change in cells, tissues or organs in order to carry out different functions. - What role does it play in plant growth and development?
Ans. Similar cells organise to form a group called tissue to perform a particular function
INTEXT QUESTIONS 20.2
- Name the plant hormones concerned with the following:
(i) Elongation of cell – Auxin
(ii) Shedding of leaves – Ethylene
(iii) Breaking seed dormancy – Abscissic acid - Mention two functions of Auxin
Ans. (i) Cell elongation (ii) Delays fall of leaves (iii) suppresses growth of lateralbud (any two) - What is the difference between dedifferentiation and redifferentiation?
Ans. Dedifferentiation : Process by which precursor cells become distinct celltypes to perform a specific function.
Redifferentiation : Process by which the plant cells while undergoing
dedifferentiation lose their capacity to divide once again but mature to
perform specific functions. - Which two hormones are essential for vascular tissue differentiation?
Ans. Auxin and Cytokinin.
INTEXT QUESTIONS 20.3
- Distinguish between Phototropism and Geotropism
Ans. Movement induced by light – Phototropism
Movement induced by gravity – Geotropism - Give two examples of turgor movement
Ans. (i) Closure of leaves on fall of darkness
(ii) dropping of leaves on touch
(iii) closing leaves of venus fly trap to catch a landing insect (any two)
TERMINAL EXERCISES
- State the different stages of cellular growth.
- Distinguish between growth and development.
- What is a sigmoid growth curve? State the different phases of sigmoid curve.
- Describe the various external factors that affect the growth of plants.
- What is vernalisation?
- Define the term Photoperiodism.
- What is auxin? What is its role in the growth of plants?
- State any two functions of Gibberellin?
- Explain the role of Cytokinins and Ethylene in growth and development of Heredityplants.
- Distinguish between epigeal germination and hypogeal germination.
- What is meant by seed germination? Describe the various factors responsiblefor seed germination.
- What is senescence?
- State any two practical utilities of growth hormones.
- What is biological stress? Describe the different types of biological stress.
- What is apical dominance? Name the hormone responsible for it.
- What is meant by plant movement? Describe any two types of movement ofplants with example.
NIOS 12th class biology Q Ans
- Origin and Evolution of Life & Classification : 12th Class Biology Notes – NIOS
- The Kingdoms Monera, Protista & Fungi : 12th Class Biology Notes – NIOS
- Kingdoms Plantae & Animalia : 12th Class Biology Question Answer Lesson 3 – NIOS
- Cell Structure & Function : 12th Class Biology Question Answer Lesson 4 – NIOS
- Tissues & Others Level of Organization : 12th Class Biology Question Answer Lesson 5 – NIOS
- Root System : 12th Class Biology Question Answer Lesson 6 – NIOS
- Shoot System : 12th Class Biology Question Answer Lesson 7 – NIOS
- Absorption, Transport & Water Loss (Transpiration) in Plants : 12th Class Biology Q Ans Lesson 8 – NIOS
- Nutrition in Plants – Mineral Nutrition : 12th Class Biology Question Answer Lesson 9 – NIOS
- Nitrogen Metabolism : 12th Class Biology Question Answer Lesson 10 – NIOS
- Photosynthesis : 12th Class Biology Question Answer Lesson 11 – NIOS
- Respiration in Plants : 12th Class Biology Question Answer Lesson 12 – NIOS
- Nutrition and Digestion : 12th Class Biology Question Answer Lesson 13 – NIOS
- Respiration and Elimination of Nitrogenous Wastes : 12th Class Biology Q Ans Lesson 14 – NIOS
- Circulation of Body Fluids : 12th Class Biology Question Answer Lesson 15 – NIOS
- Locomotion and Movement : 12th Class Biology Question Answer Lesson 16 – NIOS
- Coordination & Control : The Nervous & Endocrine Systems | 12th Class Biology Q Ans Lesson 17 – NIOS
- Homeostasis : The Steady State – 12th Class Biology Q Ans Lesson 18 – NIOS
- Reproduction in Plants : 12th Class Biology Question Answer Lesson 19 – NIOS
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