NEET Biology: Growth regulators-ethylene Practice Questions
14 free multiple-choice questions on Growth regulators-ethylene (Plant Growth and Development) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. In plant growth, ethylene primarily promotes which developmental feature?
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Correct answer: D — Senescence
Ethylene is strongly associated with senescence (aging and deterioration), especially in plant parts like leaves and fruits.
Q2. Ethylene acts primarily by which mechanism to exert its effects on plant cells?
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Correct answer: A — Activation of secondary messengers
Ethylene exerts its effects by binding to specific receptors on the cell membrane, initiating a signaling cascade within the cell.
Q3. Which tissue in plants is generally involved in the transport pathways associated with ethylene signaling?
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Correct answer: C — Phloem
While ethylene itself is gaseous, its transport and signaling pathways involve interactions across various tissues, including those involved in vascular transport, such as the phloem and xylem systems, for signal distribution.
Q4. Ethylene signaling primarily affects the cell by influencing the activity of which type of protein receptors?
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Correct answer: C — Receptor-like kinases
Ethylene acts by binding to receptors (often receptor-like kinases) on the cell membrane, initiating downstream signaling cascades.
Q5. Ethylene is synthesized in response to which type of developmental cue?
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Correct answer: B — Internal hormonal imbalance
Ethylene accumulation is often triggered by signals related to maturation, stress, or the cessation of growth, which fall under internal developmental cues.
Q6. Ethylene is primarily known as a gaseous plant hormone that regulates various processes. Which of the following is the correct classification for ethylene?
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Correct answer: B — Phytohormone
Ethylene belongs to the class of phytohormones, which are chemical substances that regulate plant growth and development.
Q7. The ripening of climacteric fruits is primarily controlled by the presence of which gaseous hormone?
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Correct answer: D — Ethylene
Ethylene is the gaseous plant hormone responsible for the ripening process in climacteric fruits. Its accumulation triggers the physiological changes associated with ripening.
Q8. Ethylene is primarily known for its role in which of the following plant physiological processes?
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Correct answer: B — Senescence and fruit ripening
Ethylene is crucial for regulating developmental processes like senescence (aging) and the ripening of fruits, making it central to these processes in plants.
Q9. Ethylene is classified as a plant growth regulator because it primarily controls which process in plants?
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Correct answer: C — Fruit ripening and senescence
Ethylene is a gaseous hormone that regulates various developmental processes in plants, most notably controlling fruit ripening and senescence (aging).
Q10. Ethylene is primarily known as which type of plant hormone?
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Correct answer: B — Ethylene
Ethylene is a gaseous plant hormone, which is a type of phytohormone that regulates growth and development in plants.
Q11. Which plant tissue is primarily responsible for the synthesis of ethylene within a plant?
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Correct answer: D — Parenchyma cells
Ethylene is synthesized mainly in the parenchymatous cells, particularly in ripening fruits and developing seeds.
Q12. In plants, the process of abscission (shedding of leaves or fruits) is often associated with the action of which hormone?
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Correct answer: B — Ethylene
Ethylene is strongly associated with the initiation of abscission, helping the plant shed unwanted parts.
Q13. Ethylene primarily triggers the process of senescence (aging) in plant organs. Which of the following is the primary effect observed during senescence?
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Correct answer: C — loss of chlorophyll and nutrient redistribution
Senescence is the biological process of aging in plants, often triggered by ethylene. This process involves the breakdown of cellular components and the redistribution of nutrients, leading to the eventual degradation of the organ.
Q14. Which of the following is the major source of ethylene production in a plant tissue?
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Correct answer: D — Senescing leaves
Senescing leaves are the primary sites where ethylene is synthesized in response to environmental signals and internal developmental changes.
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