This section focuses on the practical applications of plant growth and development concepts in agriculture, horticulture, and plant biotechnology. It is designed for Class 11–12 students , NEET aspirants , and undergraduate learners who want to connect theoretical knowledge with real-world practices.
In this section, you will study:
Use of plant growth regulators in agriculture and horticulture
Application of growth concepts in seed germination and crop yield improvement
Role of photoperiodism and vernalization in crop scheduling
Manipulation of plant growth for improved productivity and quality
Application of plant development principles in tissue culture and micropropagation
Impact of environmental factors on plant growth in controlled conditions
NCERT-based application questions, examples, and exam-oriented problems
The content is structured to enhance application-based understanding , strengthen practical reasoning , and help students confidently handle real-world and case-based questions in school exams, NEET, and undergraduate assessments .
Understand how plant growth and development concepts are applied to improve agricultural practices and plant productivity.
Q. What is the main function of chlorophyll in plants?
A.
Water absorption
B.
Nutrient transport
C.
Light absorption
D.
Gas exchange
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Solution
Chlorophyll's main function is to absorb light energy for photosynthesis.
Correct Answer:
C
— Light absorption
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Q. What is the main function of root hairs?
A.
Photosynthesis
B.
Nutrient absorption
C.
Support
D.
Storage
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Solution
Root hairs increase the surface area for water and nutrient absorption from the soil.
Correct Answer:
B
— Nutrient absorption
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Q. What is the main function of stomata in plant leaves?
A.
Nutrient absorption
B.
Gas exchange
C.
Water storage
D.
Photosynthesis
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Solution
Stomata are small openings that facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer:
B
— Gas exchange
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Q. What is the main function of stomata in plants?
A.
Nutrient absorption
B.
Gas exchange
C.
Water storage
D.
Support
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Solution
Stomata facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer:
B
— Gas exchange
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Q. What is the main function of the phloem in vascular plants?
A.
Transport water
B.
Transport nutrients
C.
Transport sugars
D.
Support structure
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Solution
Phloem is responsible for transporting sugars produced during photosynthesis throughout the plant.
Correct Answer:
C
— Transport sugars
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Q. What is the main purpose of plant tropisms?
A.
Reproduction
B.
Growth direction
C.
Nutrient uptake
D.
Water conservation
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Solution
Tropisms are growth responses that direct plants towards or away from environmental stimuli.
Correct Answer:
B
— Growth direction
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Q. What is the primary purpose of plant secondary metabolites?
A.
Photosynthesis
B.
Defense mechanisms
C.
Water absorption
D.
Growth promotion
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Solution
Secondary metabolites serve as defense mechanisms against herbivores and pathogens.
Correct Answer:
B
— Defense mechanisms
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Q. What is the primary purpose of plant tropisms?
A.
Reproduction
B.
Growth direction
C.
Nutrient absorption
D.
Water storage
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Solution
Tropisms are growth responses that direct plant growth towards or away from environmental stimuli.
Correct Answer:
B
— Growth direction
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Q. What is the role of auxins in apical dominance?
A.
Promote lateral bud growth
B.
Inhibit lateral bud growth
C.
Stimulate root growth
D.
Enhance leaf growth
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Solution
Auxins inhibit the growth of lateral buds, maintaining apical dominance in plants.
Correct Answer:
B
— Inhibit lateral bud growth
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Q. What is the significance of mycorrhizal associations in plant growth?
A.
Increase in photosynthesis
B.
Enhanced nutrient uptake
C.
Reduction of transpiration
D.
Promotion of flowering
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Solution
Mycorrhizal associations enhance nutrient uptake, particularly phosphorus, benefiting plant growth.
Correct Answer:
B
— Enhanced nutrient uptake
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Q. What is the significance of the apical meristem in plants?
A.
Root growth
B.
Leaf development
C.
Stem elongation
D.
All of the above
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Solution
The apical meristem is responsible for growth in length, contributing to root, stem, and leaf development.
Correct Answer:
D
— All of the above
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Q. What is the term for the growth response of plants to gravity?
A.
Phototropism
B.
Gravitropism
C.
Thigmotropism
D.
Hydrotropism
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Solution
Gravitropism is the growth response of plants to the direction of gravity.
Correct Answer:
B
— Gravitropism
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Q. What is the term for the process by which plants lose water vapor to the atmosphere?
A.
Transpiration
B.
Photosynthesis
C.
Respiration
D.
Germination
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Solution
Transpiration is the process of water vapor loss from plant surfaces, primarily through stomata.
Correct Answer:
A
— Transpiration
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Q. What is the term for the process by which plants lose water vapor?
A.
Transpiration
B.
Respiration
C.
Photosynthesis
D.
Germination
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Solution
Transpiration is the process of water vapor loss from plant surfaces, mainly through stomata.
Correct Answer:
A
— Transpiration
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Q. What is the term for the process by which plants produce their own food using sunlight?
A.
Respiration
B.
Photosynthesis
C.
Fermentation
D.
Transpiration
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Solution
Photosynthesis is the process by which plants convert sunlight into chemical energy.
Correct Answer:
B
— Photosynthesis
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Q. What is the term for the process by which plants respond to light direction?
A.
Phototropism
B.
Gravitropism
C.
Thigmotropism
D.
Hydrotropism
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Solution
Phototropism is the growth response of plants to light direction.
Correct Answer:
A
— Phototropism
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Q. What is the term for the process by which plants respond to light?
A.
Phototropism
B.
Gravitropism
C.
Thigmotropism
D.
Hydrotropism
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Solution
Phototropism is the growth response of plants to light direction.
Correct Answer:
A
— Phototropism
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Q. What is the term for the process by which seeds develop into new plants?
A.
Germination
B.
Pollination
C.
Fertilization
D.
Photosynthesis
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Solution
Germination is the process by which seeds develop into new plants under suitable conditions.
Correct Answer:
A
— Germination
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Q. What is the term for the symbiotic relationship between plants and nitrogen-fixing bacteria?
A.
Mutualism
B.
Commensalism
C.
Parasitism
D.
Competition
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Solution
The relationship between plants and nitrogen-fixing bacteria is a mutualistic symbiosis.
Correct Answer:
A
— Mutualism
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Q. Which part of the plant is primarily responsible for nutrient transport?
A.
Xylem
B.
Phloem
C.
Cortex
D.
Pith
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Solution
Phloem is responsible for the transport of nutrients and sugars throughout the plant.
Correct Answer:
B
— Phloem
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Q. Which part of the plant is primarily responsible for water absorption?
A.
Leaves
B.
Stems
C.
Roots
D.
Flowers
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Solution
Roots are primarily responsible for water absorption and nutrient uptake from the soil.
Correct Answer:
C
— Roots
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Q. Which plant hormone is involved in fruit ripening?
A.
Auxins
B.
Gibberellins
C.
Ethylene
D.
Cytokinins
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Solution
Ethylene is the hormone that regulates the ripening of fruits.
Correct Answer:
C
— Ethylene
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Q. Which plant hormone is involved in the regulation of fruit ripening?
A.
Auxins
B.
Gibberellins
C.
Ethylene
D.
Cytokinins
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Solution
Ethylene is the hormone that regulates the ripening of fruits, promoting changes in color and texture.
Correct Answer:
C
— Ethylene
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Q. Which plant hormone is involved in the ripening of fruits?
A.
Auxins
B.
Gibberellins
C.
Ethylene
D.
Cytokinins
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Solution
Ethylene is the hormone that regulates the ripening process in fruits, influencing color and texture changes.
Correct Answer:
C
— Ethylene
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Q. Which plant hormone is primarily involved in fruit ripening?
A.
Auxins
B.
Gibberellins
C.
Ethylene
D.
Cytokinins
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Solution
Ethylene is the hormone that plays a key role in the ripening of fruits.
Correct Answer:
C
— Ethylene
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Q. Which plant structure is primarily involved in photosynthesis?
A.
Roots
B.
Stems
C.
Leaves
D.
Flowers
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Solution
Leaves are the primary structures involved in photosynthesis, containing chlorophyll for light absorption.
Correct Answer:
C
— Leaves
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Q. Which plant structure is primarily involved in reproduction?
A.
Roots
B.
Leaves
C.
Flowers
D.
Stems
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Solution
Flowers are the reproductive structures of angiosperms, facilitating pollination and seed formation.
Correct Answer:
C
— Flowers
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Q. Which plant structure is primarily responsible for photosynthesis?
A.
Roots
B.
Stems
C.
Leaves
D.
Flowers
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Solution
Leaves are the primary structures where photosynthesis occurs, containing chlorophyll.
Correct Answer:
C
— Leaves
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Q. Which process describes the growth of a plant towards light?
A.
Phototropism
B.
Gravitropism
C.
Thigmotropism
D.
Hydrotropism
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Solution
Phototropism is the growth of a plant towards light, driven by differential growth rates.
Correct Answer:
A
— Phototropism
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Q. Which type of plant growth is characterized by the increase in girth?
A.
Primary growth
B.
Secondary growth
C.
Tertiary growth
D.
Lateral growth
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Solution
Secondary growth refers to the increase in girth of stems and roots, primarily in woody plants.
Correct Answer:
B
— Secondary growth
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