JST 5 YEARS PAST PAPERS
JST 5 years
Past Papers Click
here
Show Answers
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
لامارکزم کو بہترین طور پر کیسے بیان کیا جاتا ہے؟
Inheritance is affected by the use and disuse of organs
Change is driven by the struggle for existence
Acquired characters are determined by genetic makeup
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Lamarckism is an early evolutionary theory proposed by Jean-Baptiste Lamarck . It states that organs become stronger if used and weaker if not used. These acquired characteristics were believed to be passed to offspring For example, stretching of giraffe neck over generations. Hence, it is based on use and disuse of organs . Last verified on 12-04-2026
ایک انزائم کے تجربے میں کیمیکل ایکس (جو سبسٹریٹ سے ساخت میں ملتا جلتا ہے) شامل کرنے سے پروڈکٹ بننا بند ہو جاتا ہے۔ لیکن سبسٹریٹ کی مقدار بڑھانے سے دوبارہ ردِعمل شروع ہو جاتا ہے۔ یہ کون سا عمل ہے؟
Active activation
Competitive inhibition
Noncompetitive inhibition
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Competitive inhibition occurs when a substance similar to the substrate competes for the enzyme’s active site . Chemical X blocks the active site, stopping product formation. Increasing substrate concentration overcomes this effect. This restores enzyme activity. Therefore, this is competitive inhibition . Last verified on 12-04-2026
ایک چھوٹی آبادی جو ایک جزیرے میں محدود ہے، اچانک ایک آفت کا شکار ہو جاتی ہے اور %90 آبادی ختم ہو جاتی ہے۔ اس عمل کو کیا کہتے ہیں؟
Adaptive radiation
Bottleneck effect
Founder effect
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
When a sudden disaster drastically reduces a population size , it causes a loss of genetic variation. This random reduction is known as the bottleneck effect . The surviving population may not represent the original genetic diversity. It often leads to inbreeding and reduced adaptability. This is common in isolated populations like islands. Last verified on 12-04-2026
ایک طالب علم مائیکروسکوپ کے نیچے ایک امیبا کو خوراک کے ذرات کو نگلتے ہوئے دیکھتا ہے۔ یہ کیا ظاہر کرتا ہے کہ پروٹسٹ کیا ہوتے ہیں؟
Capable of heterotrophic nutrition
Only autotrophic
Macroscopic
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Amoeba engulfs food particles through phagocytosis . This shows that protists cannot make their own food. Instead, they depend on other organisms for nutrition. Such organisms are called heterotrophs . Therefore, protists are capable of heterotrophic nutrition . Last verified on 12-04-2026
ایک تجربے میں سائنسدان توانائی کے ذریعہ کو گلوکوز سے فیٹی ایسڈ میں بدل دیتا ہے۔ اس صورت میں سانس کے عمل کا کون سا مرحلہ براہِ راست متاثر ہوگا؟
NADP synthesis
Krebs Cycle
Glycolysis
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Cellular respiration usually begins with glycolysis , where glucose is broken down into pyruvate. If glucose is replaced with fatty acids, glycolysis cannot function in the same way. Fatty acids are broken down through different pathways (like beta-oxidation) before entering respiration. Therefore, the first and directly affected stage is glycolysis . It is the main entry point for glucose metabolism . Last verified on 12-04-2026
ایک طالب علم گاجر کی جڑ کا سلائیڈ تیار کرتا ہے اور مائیکروسکوپ کے نیچے ایک بڑا ویکیول دیکھتا ہے۔ یہ ظاہر کرتا ہے کہ خلیہ کس کا ہے؟
Animal
Plant
Virus
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Plant cells contain a large central vacuole that stores water, nutrients, and waste . In the carrot root cell , the prominent vacuole confirms it is a plant cell . Animal cells usually have small or no vacuoles . This feature helps maintain cell turgidity and support plant structure. Therefore, the observed cell is a plant cell . Last verified on 12-04-2026
گردوں کے فیل ہونے کی صورت میں ڈائیلاسس مشین کون سا کام انجام دیتی ہے؟
Circulation
Digestion
Excretion
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Dialysis is used when kidneys fail to function properly. It removes waste products, excess water, and salts from the blood. This process replaces the natural function of kidneys. Therefore, dialysis performs the function of excretion in the body. It helps maintain blood balance and prevents toxic buildup. Last verified on 12-04-2026
وہ عضیہ کون سا ہے جسے خلیے کا خودکشی تھیلا کہا جاتا ہے؟
Glyoxisome
Peroxisome
Lysosome
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Lysosomes are cell organelles that contain digestive enzymes. They break down waste materials, old cell parts, and foreign substances. When a cell is damaged, lysosomes can cause self-destruction . That is why they are called the “ suicide bags ” of the cell. They help in maintaining cellular cleanliness. Last verified on 12-04-2026
گروپ ورک کے دوران ایک طالب علم مسلسل گفتگو پر حاوی رہتا ہے اور دوسروں کے خیالات کو نظر انداز کرتا ہے۔ اس صورت میں سب سے مؤثر اور پیشگی حکمتِ عملی کون سی ہے؟
Warning the student publicly to show other students the consequences of such behaviour
Assign specific, rotating roles to each group member
Allow the group members to resolve the conflict on their own
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
In group work , dominance by one student reduces participation of others. A proactive classroom strategy prevents the problem before it grows. Assigning rotating roles ensures equal participation and responsibility. It promotes teamwork, fairness, and active engagement . This method improves group learning effectiveness. Last verified on 12-04-2026
صحیح کلاس روم مینجمنٹ پلان درج ذیل سب کچھ کرتا ہے، سوائے؟
Provides opportunities for domestic learning
Provides opportunities for social learning
Provides opportunities for academic learning
Provides opportunities for intrapersonal learning
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
A classroom management plan focuses on improving the learning environment. It supports academic, social, and personal (intrapersonal) development of students. However, domestic learning (home-related skills) is not part of classroom management . The main goal is effective teaching and student behavior control. Last verified on 12-04-2026