NEET Biology: Growth regulators-ABA Practice Questions
8 free multiple-choice questions on Growth regulators-ABA (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. ABA interacts with other growth regulators in plants. Which group of hormones does ABA generally oppose during growth phases?
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Correct answer: A — Gibberellins
ABA generally acts antagonistically to growth-promoting hormones like Gibberellins (GA) and Auxins to enforce stress responses or dormancy.
Q2. ABA is synthesized in the seeds and leaves of plants. What is the general role of ABA in coordinating the plant's response to unfavorable environmental conditions?
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Correct answer: C — Initiating dormancy and stress adaptation
ABA acts as an integrator of environmental signals, coordinating responses that lead to dormancy or stress adaptation when conditions are unfavorable.
Q3. ABA acts as a key regulator for seed dormancy. Which of the following processes is directly suppressed by high levels of ABA in seeds?
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Correct answer: A — Germination
High concentrations of ABA signal the seed to remain dormant, actively suppressing the physiological processes required for germination.
Q4. ABA signaling often involves changes in gene expression. Which category of genes are typically regulated by ABA signaling pathways?
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Correct answer: B — Genes involved in secondary metabolism and stress response
ABA signaling influences a broad range of developmental processes, including stress responses, reproductive processes, and changes in secondary metabolite production.
Q5. In the context of plant physiology, ABA levels are often correlated with water status. If ABA levels increase significantly in a plant tissue, what physiological goal is the plant attempting to achieve?
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Correct answer: C — Maintaining water balance
Increased ABA concentration signals water stress, prompting the plant to initiate mechanisms to maintain water balance and minimize potential water loss.
Q6. In the context of plant hormones, ABA functions primarily as a signal for:
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Correct answer: D — signaling water availability
ABA acts as an internal signal reflecting environmental conditions, particularly water status, communicating the need to halt growth or enter a dormant phase.
Q7. The primary role of Abscisic Acid (ABA) in seed development is:
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Correct answer: A — inducing seed dormancy
ABA is a crucial hormone that maintains seed dormancy. It inhibits the germination process until appropriate environmental conditions are met, ensuring the seed remains viable and protected.
Q8. The biosynthesis of Abscisic acid (ABA) in plants is generally promoted by which type of environmental stress?
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Correct answer: B — Saline stress
ABA synthesis is triggered when plants face osmotic stress, such as drought or high salinity, prompting the plant to conserve water.
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