Q. Ethylene is produced in response to which of the following conditions? (2023)
A.
High light intensity
B.
Low oxygen levels
C.
High humidity
D.
Low temperature
Show solution
Solution
Ethylene is produced in response to low oxygen levels, particularly during stress conditions like flooding.
Correct Answer:
B
— Low oxygen levels
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Q. What effect do gibberellins have on seed germination? (2020)
A.
Inhibit germination
B.
Promote germination
C.
No effect
D.
Delay germination
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Solution
Gibberellins promote seed germination by breaking dormancy and stimulating the growth of the embryo.
Correct Answer:
B
— Promote germination
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Q. What is the effect of gibberellins on seed germination? (2020)
A.
Inhibits germination
B.
Promotes germination
C.
No effect
D.
Causes premature germination
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Solution
Gibberellins promote seed germination by breaking dormancy and stimulating the growth of the embryo.
Correct Answer:
B
— Promotes germination
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Q. What is the effect of photoperiod on flowering in plants? (2020)
A.
It has no effect
B.
It determines the timing of flowering
C.
It inhibits flowering
D.
It promotes vegetative growth
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Solution
Photoperiod is crucial in determining the timing of flowering in many plants, influencing their reproductive cycle.
Correct Answer:
B
— It determines the timing of flowering
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Q. What is the primary function of auxins in plant growth? (2020)
A.
Promote flowering
B.
Stimulate root growth
C.
Inhibit leaf abscission
D.
Promote cell division
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Solution
Auxins primarily stimulate root growth and are involved in various growth processes.
Correct Answer:
B
— Stimulate root growth
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Q. What is the primary function of cytokinins in plant growth? (2020)
A.
Promote root growth
B.
Stimulate cell division
C.
Inhibit aging
D.
Enhance fruit ripening
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Solution
Cytokinins primarily stimulate cell division and are involved in various growth processes.
Correct Answer:
B
— Stimulate cell division
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Q. What is the primary role of auxins in apical dominance? (2019)
A.
Promote lateral bud growth
B.
Inhibit lateral bud growth
C.
Stimulate root growth
D.
Enhance leaf expansion
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Solution
Auxins inhibit the growth of lateral buds, maintaining apical dominance and directing growth towards the apex.
Correct Answer:
B
— Inhibit lateral bud growth
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Q. What is the primary role of gibberellins in seed germination? (2023)
A.
Inhibit growth
B.
Promote enzyme production
C.
Stimulate root growth
D.
Enhance photosynthesis
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Solution
Gibberellins promote enzyme production that breaks down stored food in seeds, facilitating germination.
Correct Answer:
B
— Promote enzyme production
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Q. Which hormone is involved in the process of apical dominance? (2019)
A.
Gibberellins
B.
Auxins
C.
Cytokinins
D.
Ethylene
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Solution
Auxins are primarily responsible for maintaining apical dominance by inhibiting the growth of lateral buds.
Correct Answer:
B
— Auxins
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Q. Which hormone is involved in the process of fruit ripening? (2020)
A.
Gibberellins
B.
Auxins
C.
Ethylene
D.
Cytokinins
Show solution
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 hormone is involved in the regulation of apical dominance? (2019)
A.
Auxins
B.
Cytokinins
C.
Gibberellins
D.
Ethylene
Show solution
Solution
Auxins play a crucial role in maintaining apical dominance by inhibiting the growth of lateral buds.
Correct Answer:
A
— Auxins
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Q. Which hormone is involved in the regulation of stomatal closure during water stress? (2023)
A.
Gibberellins
B.
Cytokinins
C.
Abscisic acid
D.
Auxins
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Solution
Abscisic acid is involved in the regulation of stomatal closure during water stress to prevent water loss.
Correct Answer:
C
— Abscisic acid
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Q. Which hormone is primarily involved in the response of plants to drought stress? (2023)
A.
Gibberellins
B.
Auxins
C.
Abscisic acid
D.
Cytokinins
Show solution
Solution
Abscisic acid plays a crucial role in helping plants respond to drought stress by closing stomata.
Correct Answer:
C
— Abscisic acid
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Q. Which hormone is primarily responsible for fruit ripening? (2023)
A.
Auxins
B.
Gibberellins
C.
Ethylene
D.
Cytokinins
Show solution
Solution
Ethylene is the primary hormone responsible for the ripening of fruits.
Correct Answer:
C
— Ethylene
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Q. Which hormone is primarily responsible for promoting cell elongation in plants? (2021)
A.
Gibberellins
B.
Auxins
C.
Cytokinins
D.
Ethylene
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Solution
Auxins are known to promote cell elongation by loosening the cell walls, allowing cells to expand.
Correct Answer:
B
— Auxins
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Q. Which of the following is a characteristic of gibberellins? (2019)
A.
Inhibition of seed germination
B.
Promotion of flowering
C.
Stimulation of leaf senescence
D.
Inhibition of stem elongation
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Solution
Gibberellins promote flowering and are also involved in seed germination and stem elongation.
Correct Answer:
B
— Promotion of flowering
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Q. Which of the following is a characteristic of phototropism? (2019)
A.
Growth towards light
B.
Growth away from light
C.
Uniform growth in all directions
D.
Growth in response to gravity
Show solution
Solution
Phototropism is the growth of a plant towards light, facilitated by auxins.
Correct Answer:
A
— Growth towards light
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Q. Which of the following is a function of cytokinins in plant development? (2023)
A.
Promote leaf senescence
B.
Delay aging of leaves
C.
Inhibit cell division
D.
Promote root growth
Show solution
Solution
Cytokinins are known to delay leaf senescence and promote cell division, enhancing growth.
Correct Answer:
B
— Delay aging of leaves
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Q. Which of the following is a function of cytokinins in plants? (2019)
A.
Promoting leaf senescence
B.
Stimulating root growth
C.
Inhibiting cell division
D.
Promoting shoot development
Show solution
Solution
Cytokinins promote shoot development and are involved in delaying leaf senescence.
Correct Answer:
D
— Promoting shoot development
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Q. Which of the following is a function of cytokinins? (2019)
A.
Promoting leaf senescence
B.
Stimulating lateral bud growth
C.
Inhibiting cell division
D.
Promoting root growth
Show solution
Solution
Cytokinins stimulate lateral bud growth and delay leaf senescence.
Correct Answer:
B
— Stimulating lateral bud growth
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Q. Which of the following is a function of ethylene in plants? (2022)
A.
Promotes leaf growth
B.
Stimulates root development
C.
Inhibits fruit ripening
D.
Promotes senescence
Show solution
Solution
Ethylene promotes senescence, which is the aging process in plants, leading to leaf drop and fruit ripening.
Correct Answer:
D
— Promotes senescence
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Q. Which of the following is NOT a function of cytokinins? (2019)
A.
Promoting cell division
B.
Delaying leaf senescence
C.
Stimulating root growth
D.
Promoting apical dominance
Show solution
Solution
Cytokinins do not promote apical dominance; rather, they promote lateral bud growth.
Correct Answer:
D
— Promoting apical dominance
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Q. Which of the following processes is directly influenced by auxins? (2021)
A.
Phototropism
B.
Photosynthesis
C.
Respiration
D.
Transpiration
Show solution
Solution
Auxins are responsible for phototropism, the growth of plants towards light.
Correct Answer:
A
— Phototropism
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Q. Which of the following processes is influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
All of the above
Show solution
Solution
Auxins influence various processes including phototropism, gravitropism, and apical dominance.
Correct Answer:
D
— All of the above
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Q. Which of the following processes is NOT directly influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
Photosynthesis
Show solution
Solution
Photosynthesis is not directly influenced by auxins; they mainly affect growth and development processes.
Correct Answer:
D
— Photosynthesis
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Q. Which of the following processes is NOT influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
Fruit ripening
Show solution
Solution
Fruit ripening is primarily influenced by ethylene, not auxins.
Correct Answer:
D
— Fruit ripening
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Q. Which of the following processes is NOT influenced by plant hormones? (2021)
A.
Seed germination
B.
Fruit ripening
C.
Photosynthesis
D.
Flowering
Show solution
Solution
Photosynthesis is a biochemical process that is not directly influenced by plant hormones.
Correct Answer:
C
— Photosynthesis
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Q. Which of the following processes is primarily regulated by auxins? (2021)
A.
Phototropism
B.
Photosynthesis
C.
Respiration
D.
Transpiration
Show solution
Solution
Auxins are primarily responsible for phototropism, the growth of plants towards light.
Correct Answer:
A
— Phototropism
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Q. Which plant hormone is known for its role in apical dominance? (2023)
A.
Ethylene
B.
Auxins
C.
Cytokinins
D.
Gibberellins
Show solution
Solution
Auxins are responsible for maintaining apical dominance by inhibiting the growth of lateral buds.
Correct Answer:
B
— Auxins
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Q. Which plant hormone is known for its role in fruit ripening? (2023)
A.
Auxins
B.
Cytokinins
C.
Ethylene
D.
Gibberellins
Show solution
Solution
Ethylene is the hormone responsible for the ripening of fruits and is produced in response to various stimuli.
Correct Answer:
C
— Ethylene
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Showing 1 to 30 of 41 (2 Pages)
Plant Physiology - Plant Growth & Development MCQ & Objective Questions
Understanding "Plant Physiology - Plant Growth & Development" is crucial for students preparing for various exams. This topic not only forms a significant part of the syllabus but also enhances your grasp of essential biological concepts. Practicing MCQs and objective questions helps in reinforcing your knowledge and boosts your confidence, ultimately leading to better scores in exams.
What You Will Practise Here
Key concepts of plant growth and development
Hormonal regulation in plants and their effects
Photosynthesis and its significance in plant physiology
Factors affecting plant growth and development
Stages of plant growth: germination to maturity
Important definitions and terminologies in plant physiology
Diagrams illustrating plant structures and processes
Exam Relevance
The topic of "Plant Physiology - Plant Growth & Development" is frequently featured in CBSE, State Boards, NEET, and JEE exams. Students can expect questions that test their understanding of plant hormones, growth processes, and physiological responses. Common question patterns include multiple-choice questions that require application of concepts, as well as direct definitions and explanations of key terms.
Common Mistakes Students Make
Confusing different plant hormones and their functions
Overlooking the impact of environmental factors on plant growth
Misunderstanding the stages of plant development
Neglecting to relate theoretical concepts to practical examples
FAQs
Question: What are the main hormones involved in plant growth?Answer: The main hormones include auxins, gibberellins, cytokinins, abscisic acid, and ethylene, each playing a unique role in growth and development.
Question: How does light affect plant growth?Answer: Light influences photosynthesis, which is vital for energy production in plants, and also affects growth patterns through phototropism.
Now is the time to enhance your understanding of "Plant Physiology - Plant Growth & Development" by solving practice MCQs. Test your knowledge, identify your strengths and weaknesses, and prepare effectively for your exams!