Which combinations of the following statements about Abscisic Acid (ABA) in plants are correct?
(A) ABA is important for plant development and desiccation tolerance.
(B) ABA influences the expression of various genes, including the gene for Late Embryogenesis Abundant (LEA) proteins.
(C) ABA also regulates the closure of aquaporins.
(D) Like GAs, the ABA also strongly promotes early flowering in plants.
Choose the correct answer from the options given below:
पौधों में एब्सिसिक एसिड (ABA) के बारे में निम्नलिखित
कथनों में से कौन सा संयोजन सही है?
(A) ABA पादप विकास और शुष्कन सहनशीलता (desiccation tolerance) के लिए महत्वपूर्ण है।
(B) ABA विभिन्न जीनों की अभिव्यक्ति को प्रभावित करता है, जिसमें लेट एम्ब्रियोजेनेसिस एबंडेंट (LEA) प्रोटीन का जीन भी शामिल है।
(C) ABA एक्वापोरिन (aquaporins) के बंद होने को भी नियंत्रित करता है।
(D) जिबरेलिन (GAs) की तरह, ABA भी पौधों में शीघ्र पुष्पन को दृढ़ता से बढ़ावा देता है।
नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:
Functions of Abscisic Acid:
- Statement (A) is CORRECT: Known as the primary stress hormone, ABA promotes seed maturation, accumulation of nutrient reserves, and desiccation tolerance during late embryogenesis.
- Statement (B) is CORRECT: ABA induces transcription of genes encoding osmoprotectants and LEA (Late Embryogenesis Abundant) proteins that protect cellular membranes and enzymes against dehydration damage.
- Statement (C) is CORRECT: ABA modulates water flow and cellular hydraulic conductivity by regulating the gating/closure of plasma membrane aquaporins (water channels) and triggering stomatal closure in guard cells.
- Statement (D) is INCORRECT: Gibberellins (GA) promote bolting and flowering, whereas ABA typically represses vegetative growth, enforces dormancy, and delays flowering in most plant species.
Thus, statements (A), (B), and (C) are correct.
Correct Answer: Option 1 ((A), (B) and (C) only).
विस्तृत व्याख्या:
Functions of Abscisic Acid (एब्सिसिक अम्ल के कार्य - स्ट्रेस हॉर्मोन):
- Statement (A) is CORRECT: Known as the primary stress hormone, ABA promotes seed maturation, accumulation of nutrient reserves, and desiccation tolerance during late embryogenesis.
- Statement (B) is CORRECT: ABA induces transcription of genes encoding osmoprotectants and LEA (Late Embryogenesis Abundant) proteins that protect cellular membranes and enzymes against dehydration damage.
- Statement (C) is CORRECT: ABA modulates water flow and cellular hydraulic conductivity by regulating the gating/closure of plasma membrane aquaporins (water channels) and triggering stomatal closure in guard cells.
- Statement (D) is INCORRECT: Gibberellins (GA) promote bolting and flowering, whereas ABA typically represses vegetative growth, enforces dormancy, and delays flowering in most plant species.
Thus, statements (A), (B), and (C) are correct.
Correct Answer: Option 1 ((A), (B) and (C) only).
Explanation not matching this question?
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