Plant Growth and Development explains how plants grow, differentiate, and respond to internal and external factors throughout their life cycle. This category focuses on the processes controlling growth, differentiation, and development , making it suitable for Class 11–12 students , NEET aspirants , and undergraduate learners .
In this section, you will study:
Growth, development, and differentiation in plants
Meristematic activity and patterns of plant growth
Phases of plant growth and growth kinetics
Plant growth regulators and their physiological roles
Photoperiodism, vernalization, and plant movements
Environmental factors affecting plant growth and development
NCERT-based explanations, diagrams, MCQs, and exam-oriented questions
The content is structured to build clear conceptual understanding , improve process-based reasoning , and help students perform confidently in school examinations, NEET, and undergraduate assessments .
Develop a strong understanding of how plants grow and develop by linking physiological processes with environmental and hormonal regulation.
A.
Growth towards light
B.
Growth away from light
C.
Growth in response to gravity
D.
Growth in response to water
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Solution
Phototropism is the growth of a plant towards light, driven by auxin distribution.
Correct Answer:
A
— Growth towards light
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Q. What is the main function of the cambium in plants?
A.
Photosynthesis
B.
Water transport
C.
Growth in thickness
D.
Nutrient storage
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Solution
The cambium is responsible for secondary growth, allowing plants to increase in thickness.
Correct Answer:
C
— Growth in thickness
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Q. What is the primary function of root hairs?
A.
Photosynthesis
B.
Water absorption
C.
Nutrient storage
D.
Support
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Solution
Root hairs increase the surface area for water and nutrient absorption from the soil.
Correct Answer:
B
— Water absorption
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Q. What is the primary function of stomata in plants?
A.
Nutrient storage
B.
Gas exchange
C.
Water storage
D.
Support
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Solution
Stomata facilitate gas exchange, allowing carbon dioxide in and oxygen out.
Correct Answer:
B
— Gas exchange
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Q. What is the primary function of the cambium in plants?
A.
Photosynthesis
B.
Water transport
C.
Growth in thickness
D.
Nutrient storage
Show solution
Solution
The cambium is responsible for secondary growth, allowing plants to increase in thickness.
Correct Answer:
C
— Growth in thickness
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Q. What is the primary hormone responsible for promoting cell elongation in plants?
A.
Gibberellins
B.
Auxins
C.
Cytokinins
D.
Ethylene
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Solution
Auxins are the primary hormones that promote cell elongation, particularly in stems.
Correct Answer:
B
— Auxins
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Q. What is the role of cytokinins in plant growth?
A.
Promote root growth
B.
Stimulate cell division
C.
Inhibit leaf senescence
D.
All of the above
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Solution
Cytokinins stimulate cell division, promote root growth, and inhibit leaf senescence.
Correct Answer:
D
— All of the above
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Q. What is the role of mycorrhizae in plant growth?
A.
Water storage
B.
Nutrient absorption
C.
Photosynthesis
D.
Gas exchange
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Solution
Mycorrhizae enhance nutrient absorption, particularly phosphorus, from the soil.
Correct Answer:
B
— Nutrient absorption
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Q. What is the role of mycorrhizal fungi in plant growth?
A.
Photosynthesis
B.
Nutrient absorption
C.
Water storage
D.
Pollination
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Solution
Mycorrhizal fungi enhance nutrient absorption, particularly phosphorus, for plants.
Correct Answer:
B
— Nutrient absorption
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Q. What is the role of the apical meristem in plants?
A.
Photosynthesis
B.
Cell division and growth
C.
Water absorption
D.
Nutrient storage
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Solution
The apical meristem is responsible for cell division and growth at the tips of roots and shoots.
Correct Answer:
B
— Cell division and growth
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Q. What is the term for the growth response of a plant to light?
A.
Thigmotropism
B.
Phototropism
C.
Hydrotropism
D.
Gravitropism
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Solution
Phototropism is the growth response of a plant to light, typically resulting in bending towards the light source.
Correct Answer:
B
— Phototropism
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Q. What is the term for the process by which plants lose water vapor through small openings in their leaves?
A.
Transpiration
B.
Respiration
C.
Photosynthesis
D.
Germination
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Solution
Transpiration is the process of water vapor loss from plant leaves through stomata.
Correct Answer:
A
— Transpiration
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Q. Which environmental factor is most critical for seed germination?
A.
Light
B.
Temperature
C.
Soil type
D.
Humidity
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Solution
Temperature is a critical factor for seed germination, as it affects metabolic processes.
Correct Answer:
B
— Temperature
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Q. Which of the following is NOT a macronutrient essential for plant growth?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Iron
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Solution
Iron is a micronutrient, while nitrogen, phosphorus, and potassium are macronutrients.
Correct Answer:
D
— Iron
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Q. Which of the following is NOT a phase of plant growth?
A.
Maturation
B.
Germination
C.
Juvenile
D.
Reproductive
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Solution
Maturation is not a recognized phase of plant growth; the main phases are germination, juvenile, and reproductive.
Correct Answer:
A
— Maturation
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Q. Which phase of the plant life cycle is characterized by the formation of gametes?
A.
Sporophyte
B.
Gametophyte
C.
Seedling
D.
Mature plant
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Solution
The gametophyte phase is where gametes are produced in the plant life cycle.
Correct Answer:
B
— Gametophyte
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Q. Which plant structure is primarily responsible for anchoring the plant and absorbing water and nutrients?
A.
Stem
B.
Leaf
C.
Root
D.
Flower
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Solution
Roots anchor the plant and are responsible for water and nutrient absorption.
Correct Answer:
C
— Root
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Q. Which plant structure is primarily responsible for nutrient storage?
A.
Roots
B.
Leaves
C.
Stems
D.
Flowers
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Solution
Roots are primarily responsible for nutrient storage in many plants.
Correct Answer:
A
— Roots
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Q. Which plant structure is primarily responsible for 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 process involves the conversion of light energy into chemical energy in plants?
A.
Respiration
B.
Photosynthesis
C.
Transpiration
D.
Fermentation
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Solution
Photosynthesis is the process that converts light energy into chemical energy in the form of glucose.
Correct Answer:
B
— Photosynthesis
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Q. Which stage of the plant life cycle is characterized by the formation of gametes?
A.
Sporophyte
B.
Gametophyte
C.
Seedling
D.
Mature plant
Show solution
Solution
The gametophyte stage is where gametes are produced in the plant life cycle.
Correct Answer:
B
— Gametophyte
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Q. Which structure is responsible for the production of pollen in flowering plants?
A.
Stigma
B.
Anther
C.
Ovary
D.
Style
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Solution
The anther is the part of the stamen that produces pollen in flowering plants.
Correct Answer:
B
— Anther
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Q. Which type of plant growth occurs at the tips of roots and shoots?
A.
Lateral growth
B.
Primary growth
C.
Secondary growth
D.
Apical growth
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Solution
Primary growth occurs at the tips of roots and shoots, leading to an increase in length.
Correct Answer:
B
— Primary growth
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Q. Which type of plant growth occurs in response to environmental stimuli?
A.
Primary growth
B.
Secondary growth
C.
Tropic growth
D.
Lateral growth
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Solution
Tropic growth refers to directional growth in response to environmental stimuli, such as light or gravity.
Correct Answer:
C
— Tropic growth
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Q. Which type of plant is characterized by having a vascular system?
A.
Mosses
B.
Ferns
C.
Liverworts
D.
Algae
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Solution
Ferns are vascular plants, possessing a vascular system for transporting water and nutrients.
Correct Answer:
B
— Ferns
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Q. Which type of plant reproduction involves the use of spores?
A.
Asexual reproduction
B.
Sexual reproduction
C.
Vegetative reproduction
D.
Grafting
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Solution
Sexual reproduction in plants often involves the production of spores, especially in ferns and mosses.
Correct Answer:
B
— Sexual reproduction
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Q. Which type of plant tissue is responsible for the transport of water and minerals?
A.
Phloem
B.
Xylem
C.
Cortex
D.
Pith
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Solution
Xylem is the tissue responsible for transporting water and minerals from roots to other parts of the plant.
Correct Answer:
B
— Xylem
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