BIOLOGY
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
- Bacteria
- Virus
- Vibrio cholerae
- Both A and C
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Explanation
Last verified on 3-03-2026
اوزون کی تہہ کے خاتمے کا ذمہ دار کون سی گیس کا ایٹم ہے؟
- Nitrogen
- Carbon dioxide
- Chlorine
- None of these
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Explanation
- Chlorine atoms destroy ozone molecules (O₃) through chemical reactions in the stratosphere.
- Chlorine is mainly released from chlorofluorocarbons (CFCs) when ultraviolet radiation breaks them down.
- One chlorine atom can destroy thousands of ozone molecules before being removed from the stratosphere.
- The Montreal Protocol (1987) was adopted to phase out ozone-depleting substances such as CFCs.
Last verified on 02-11-2026
آیوڈین کی کمی سے کون سی بیماری ہوتی ہے؟
- Imbalances in fluid volume in the vessels and tissues
- Goiter
- Tetnas
- Cancer
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Explanation
- Iodine deficiency causes goiter, an enlargement of the thyroid gland.
- Iodine is essential for the production of thyroid hormones.
- Severe iodine deficiency during pregnancy or early childhood can impair brain development.
Last verified on 07-09-2026
چھوئی موئی کا نباتاتی نام کیا ہے؟
- Mimosa Pudica
- Acacia Catechu
- Prosopis Glandulosa
- None of these
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Explanation
- Mimosa pudica is commonly known as the touch-me-not or sensitive plant.
- Its leaves fold inward when touched or shaken.
- This response is called thigmonasty.
- It belongs to the family Fabaceae (legume family).
- It is native to Central and South America.
Last verified on 02-11-2026
بخار یا جسمانی درجہ حرارت میں اضافہ کس کے خلاف حفاظتی نظام کو متحرک کرنے میں مدد دیتا ہے؟
- Shivering
- Cold
- Pathogens
- None of these
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Explanation
- Fever is a natural defence response of the immune system against infections.
- Increased body temperature can slow the growth of some pathogens, including bacteria and viruses.
- Fever also helps activate immune cells and supports the body's fight against infection.
- Normal human body temperature is approximately 37°C (98.6°F).
Last verified on 02-11-2026
پرندے، سانپ اور مچھلی جیسے جانداروں کی کون سی خصوصیت درست طور پر بیان کرتی ہے؟
- Multicellular eukaryotic cell, no cell wall, heterotrophy
- Organisms multicellular, contain cell wall, heterotroph
- Eukaryotic cell with cell wall, absorptive heterotroph
- None of these
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Explanation
- Birds, snakes and fish belong to Kingdom Animalia.
- Animals are multicellular eukaryotes, meaning their cells contain a true nucleus and membrane-bound organelles.
- Animal cells lack a cell wall and obtain food from other organisms, so they are heterotrophs.
- Animals do not contain chlorophyll and cannot make their own food through photosynthesis.
Last verified on 02-11-2026
کوئلہ، تیل، قدرتی گیس اور دھاتیں کس قسم کے وسائل کی مثالیں ہیں؟
- Renewable
- Non-renewable
- Both A and
- None of these
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Explanation
- Non-renewable resources are available in limited quantities and cannot be replenished within a short period.
- Coal, petroleum, and natural gas are fossil fuels formed from ancient organic matter over millions of years.
- Metals such as iron and copper are obtained from mineral ores.
- They are considered non-renewable resources.
- Conservation, recycling, and efficient use help reduce the depletion of these resources.
Last verified on 02-11-2026
مایوفائبرلز کن چھوٹی سکڑنے والی اکائیوں پر مشتمل ہوتے ہیں؟
- Gastromere
- Myomere
- Sarcomere
- None of these
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Explanation
- A sarcomere is the basic structural and functional contractile unit of a myofibril.
- It extends from one Z-line to the next Z-line and contains actin (thin) and myosin (thick) filaments.
- During muscle contraction, these filaments slide past one another, shortening the sarcomere.
- Sarcomeres give skeletal and cardiac muscles their characteristic striped appearance.
Last verified on 02-11-2026
ہیومرس کی ہڈی کس ہڈی کے ساتھ مل کر بال اینڈ ساکٹ جوڑ بناتی ہے؟
- Clavicle
- Coracoid
- Scapula
- None of these
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Explanation
- The humerus (upper arm bone) forms a ball-and-socket joint with the scapula (shoulder blade).
- The rounded head of the humerus fits into the glenoid cavity of the scapula, allowing movement in multiple directions.
- The shoulder joint provides a wide range of movement, including rotation, flexion, and extension.
- The hip joint is also a ball-and-socket joint, formed by the femur and the hip bone.
Last verified on 02-11-2026
ہر مایوسین فلامنٹ کے گرد کتنے ایکٹن فلامنٹس ہوتے ہیں؟
- Six
- Seven
- Right
- None of these
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Explanation
- In skeletal muscle, each thick myosin filament is surrounded by six thin actin filaments in the hexagonal arrangement.
- Myosin forms the thick filaments, while actin forms the thin filaments in muscle fibres.
- During muscle contraction, myosin interacts with actin to produce movement through the sliding filament mechanism.
Last verified on 02-11-2026
