BIOLOGY
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
میوسس میں ہومولوگس کروموسوم جوڑوں کی شکل میں خطِ استوا پر کب ترتیب پاتے ہیں؟
Metaphase II of meiosis
Metaphase of mitosis
Metaphase I of meiosis
None of these
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Explanation
In Metaphase I , homologous chromosomes pair up and line along the equatorial plate . Each pair is called a bivalent (tetrad). This does not happen in mitosis or Metaphase II. Last verified on 20-05-2026
مییوسس میں عبور کرنا ______ میں ہوتا ہے؟
Diakinesis
Pachytene
Zygotene
None of these
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Explanation
Crossing over occurs in Pachytene stage of Prophase I. Homologous chromosomes are fully paired and exchange genetic material at this stage. This leads to new gene combinations. Last verified on 20-05-2026
دو مینڈکوں کی آبادیوں میں ملاپ ہو سکتا ہے، لیکن جنین جلد مر جاتا ہے اور بالغ نہیں بنتا۔ یہ کس قسم کی تولیدی تنہائی ہے؟
Postzygotic isolation
Habitat isolation
Behavioral isolation
None of these
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Explanation
Reproductive isolation prevents successful breeding between species . It can occur before or after fertilization . Postzygotic isolation happens after zygote formation. It leads to non-viable or infertile offspring. It helps maintain species separation . Last verified on 20-05-2026
ایلوپیٹرک اسپیسیشن کے آغاز کے لیے کون سا واقعہ ضروری ہوتا ہے؟
Sudden mutation in all individuals
Increased gene flow between populations
Geographic separation that reduces gene flow
None of these
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Explanation
Speciation is the formation of new species. Allopatric speciation occurs due to physical separation. Populations become isolated from each other. Gene flow between them is reduced or stopped . Over time, they evolve into different species. Last verified on 20-05-2026
مندرجہ ذیل میں سے کون سا نظریہ لامارک کے ارتقاء کے نظریے سے سب سے کم مطابقت رکھتا ہے؟
Use and disuse of organs
Inheritance of acquired characteristics
Organisms change according to environmental needs
Random mutations appear before environment needs them
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Explanation
Jean-Baptiste Lamarck proposed an early theory of evolution. He believed organisms change according to need and environment . He explained evolution through use and disuse of organs . Acquired characteristics were thought to pass to offspring . Modern genetics later challenged many of his ideas. Last verified on 20-05-2026
مچھروں کی آبادی میں کچھ افراد کے پاس پہلے سے ایسا جین موجود تھا جو کیڑے مار دوا کے اثر کو کم کرتا تھا۔ بار بار اسپرے کے بعد وہ جین عام ہو گیا۔ اس تبدیلی کی بہترین وجہ کیا ہے؟
Natural selection acting on pre-existing variation
Genetic drift
Mutation after spraying
None of these
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Explanation
Populations naturally contain genetic variation. Some individuals may already have resistant traits. Insecticide kills non-resistant mosquitoes. Resistant mosquitoes survive and reproduce more. Over time, the resistant gene becomes common. Last verified on 20-05-2026
کارٹیلیج والی مچھلیاں (جیسے شارک) کس گروہ سے تعلق رکھتی ہیں؟
Osteichthyes
Amphibia
Chondrichthyes
None of these
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Explanation
Fishes are mainly divided into two major groups. One group has bony skeleton , the other has cartilage. Cartilaginous fishes are more primitive in nature. They include sharks and rays . They are well-adapted marine predators. Last verified on 20-05-2026
جِمنوسپرمز کی خاص پہچان کیا ہے؟
Absence of vascular tissues
Naked seeds
Seeds enclosed within a fruit
None of these
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Explanation
Gymnosperms are seed-producing plants. They are usually woody and evergreen . They do not produce flowers or fruits . Their seeds are exposed (not enclosed). They are among the oldest seed plants . Last verified on 20-05-2026
اینجیوسپرمز کی خاص پہچان کیا ہے؟
Absence of vascular tissues
Naked seeds
Seeds enclosed within a fruit
None of these
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Explanation
Angiosperms are flowering plants. They are the most advanced group of plants. They produce seeds through flowers . Seeds are protected inside fruits . They dominate most land ecosystems . Last verified on 20-05-2026
بنیادی پیداواری صلاحیت سے کیا مراد ہے؟
Total energy used by consumers in an ecosystem
Rate at which producers convert solar energy into chemical energy
Decomposition rate of dead organisms
None of these
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Explanation
Primary productivity is an ecological concept. It is related to energy production in ecosystems. Producers like plants use sunlight for food formation. This process is done through photosynthesis . It forms the base of all food chains. Last verified on 20-05-2026