SPSC 25 YEARS PAST PAPERS 2001 TO 2026
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
لیموں کے جڑ نوڈولس میں ، لیگیموگلوبن اہم ہے کیونکہ یہ ____؟
Acts as an oxygen scavenger
Transports oxygen to the root nodule
Acts as a catalyst in transamination
None of these
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Explanation
Leg-haemoglobin binds to oxygen, preventing it from inhibiting nitrogenase, the enzyme responsible for nitrogen fixation. This helps maintain the low oxygen conditions required for nitrogen-fixing bacteria to function efficiently.
پودوں میں تبدیلی کے لئے کون سا طریقہ عام طور پر استعمال نہیں ہوتا ہے؟
Natural selection
Agrobacterium mediated transformation
Gene gun method
None of these
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Explanation
Natural selection is an evolutionary process, not a method for introducing foreign genes into plants. Agrobacterium-mediated transformation and the gene gun method are commonly used techniques for plant transformation.
کلوننگ پودوں کے لئے استعمال ہونے والی تکنیک مندرجہ ذیل میں سے کون سا ہے؟
Hybridization
Tissue culture
Electrophoresis
None of these
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Explanation
Tissue culture is a cloning technique where plant cells or tissues grow in a nutrient medium under sterile conditions. It allows rapid multiplication of genetically identical plants.
مندرجہ ذیل میں سے کون سا جوڑا ہے ، صحیح طور پر مماثل نہیں ہے؟
Abscisic add-Stomatal closure
IAA-Cell wall elongation
Gibberellic acid-Leaf fall
None of these
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Explanation
Gibberellic acid promotes stem elongation, seed germination, and flowering rather than leaf fall. Leaf fall (abscission) is mainly regulated by abscisic acid (ABA) and ethylene.
پودوں کا استعمال سستے اوسموٹیکم کے طور پر کون سا مادہ ہے؟
Ascorbic acid
Minerals
Proline
None of these
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Explanation
Proline acts as a cheap osmoticum . It helping plants maintain water balance under drought, salinity, and other stress conditions. It stabilizes proteins, protects membranes, and scavenges reactive oxygen species (ROS).
The marble was rolled by Robin in a small plastic pipe.
The marble was rolled through a small plastic pipe by Robin.
A small plastic pipe was rolled through a marble by Robin.
None of these
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Explanation
The marble was rolled through a small plastic pipe by Robin .
This is the correct passive voice of the given sentence while maintaining proper word order. The subject " Robin " becomes the agent, and " the marble " becomes the object in passive form.
فوٹووراسپیریشن یہ ہے جو سائیکل میں ہوتا ہے؟
Glycolate
Kerbs
Pyruvate
None of these
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Explanation
Photorespiration occurs in the Glycolate pathway (C₂ cycle) , where glycolate is formed when RuBisCO fixes oxygen instead of carbon dioxide. This process takes place in the chloroplasts, peroxisomes, and mitochondria of plants.
Musician
Singer
Composer
None of these
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Explanation
A book is created by an author . Just as a symphony is created by a composer . The composer writes and arranges musical pieces , similar to how an author writes a book .
مندرجہ ذیل میں سے کون سا نائٹروجن فکسنگ انزائم ہے؟
Nitrate reductase
Urease
Arginase
None of these
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Explanation
Nitrate reductase is an enzyme involved in the nitrogen cycle that reduces nitrate (NO₃⁻) to nitrite (NO₂⁻) , a crucial step in nitrogen assimilation in plants. It plays a key role in converting inorganic nitrogen into forms usable by plants for amino acid and protein synthesis.
جب گلائکولیسس کے دوران ایک ہیکسوز شوگر انو انو کو پیروکی ایسڈ کے دو انووں میں تبدیل کیا جاتا ہے تو کتنے اے ٹی پی انو تیار ہوتے ہیں؟
8
10
12
None of these
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Explanation
Glycolysis Overview : One molecule of hexose sugar (e.g., glucose) undergoes glycolysis, producing two molecules of pyruvic acid . ATP Yield in Glycolysis : ATP Used : 2 ATP (investment phase) ATP Produced : 4 ATP (payoff phase) Net ATP Gain : 2 ATP NADH Production : 2 NADH (each NADH = 3 ATP in the electron transport chain, yielding 6 ATP) Total ATP = 2 + 6 = 8 ATP
