BIOLOGY
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
انسانوں میں مونوسومی (ٹواین-1) غیر معمولی حالت کون سی ہے؟
- Klinefelter syndrome
- Turner's syndrome
- Edward's syndrome
- Down's syndrome
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Explanation
- Turner’s syndrome is a monosomic condition (2N − 1).
- It occurs when one X chromosome is missing in females.
- The karyotype is 45, X instead of 46 chromosomes.
- It leads to developmental and reproductive abnormalities.
Last verified on 04-06-2026
کلاس آراکنڈا کے درج ذیل میں سے کون سے ارکان بنیادی طور پر طفیلی ہوتے ہیں؟
- Spider
- Ticks & Mites
- Trilobites
- Scorpions
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Explanation
- Ticks and mites are primary parasitic arachnids.
- They live on or inside host organisms and feed on blood or tissues.
- They can transmit diseases to humans and animals.
- Other arachnids are mostly free-living predators.
Last verified on 04-06-2026
انسانی جسم میں خون جمنے کے لیے درج ذیل میں سے کون سا ضروری ہے؟
- Phylloquinone
- Ergocalciferol
- Retinol
- All of these
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Explanation
- Phylloquinone is Vitamin K₁.
- It is essential for blood coagulation (clotting).
- It helps in synthesis of clotting factors in the liver.
- Without it, blood clotting process is impaired.
Last verified on 04-06-2026
لبلبہ سے خارج ہونے والا پولی پیپٹائیڈ ہارمون کون سا ہے؟
- Glycagon
- Ptyalin
- Glycogen
- Pancreozymin
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Explanation
- Glucagon is a polypeptide hormone secreted by the pancreas.
- It increases blood glucose level in the body.
- It works opposite to insulin.
- It is produced by alpha cells of islets of Langerhans.
Last verified on 04-06-2026
ڈاؤن سنڈروم کس وجہ سے ہوتا ہے؟
- Nondisjunction of chromosomes
- Crossing over between genes
- Linkages of genes
- Sex linked inheritance
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Explanation
- Down’s syndrome is caused by an extra copy of chromosome 21.
- This occurs due to nondisjunction during meiosis.
- Nondisjunction means chromosomes fail to separate properly.
- It results in trisomy 21 condition.
Last verified on 04-06-2026
بڑھاپے میں کون سا غدہ غیر فعال ہو جاتا ہے؟
- Pituitary
- Thymus
- Adrenal
- Pineal
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Explanation
- Thymus gland becomes inactive during old age.
- It is active during childhood for immune system development.
- It helps in maturation of T-lymphocytes (T cells).
- After puberty, it gradually shrinks and loses function.
Last verified on 04-06-2026
ٹرائلوبائٹس کس دور میں ارتقاء پذیر ہوئے؟
- Precambrian
- Ordovician
- Silurian
- Cambrian
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Explanation
- Trilobites first evolved during the Cambrian period.
- Cambrian Period → ~541–485 million years ago
- This period is known for the “Cambrian Explosion” of life forms.
- Trilobites were early marine arthropods.
- They became one of the most successful ancient fossil groups.
Last verified on 04-06-2026
مندرجہ ذیل میں سے کون سا خلیاتی عضیہ صرف پروٹوزوا میں پایا جاتا ہے؟
- Plasma membrane
- Cilia
- Contractile vacuole
- Pseudopodia
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Explanation
- Contractile vacuole is an organelle found in protozoans.
- It helps in removing excess water from the cell.
- It maintains water balance (osmoregulation).
- It prevents the cell from bursting in freshwater environments.
Last verified on 04-06-2026
وہ کون سے لیمفوسائٹس ہیں جو پلازما جھلی میں سوراخ بناتے ہیں؟
- B cells
- Killer or Cytotoxic T cells
- Suppressor T cells
- Helper T cells
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Explanation
- Cytotoxic T cells are responsible for killing infected or abnormal cells.
- They create pores (holes) in the target cell membrane.
- This leads to cell death through lysis.
- They are an important part of cell-mediated immunity.
Last verified on 04-06-2026
جلد کی درمیانی تہہ میں درج ذیل میں سے سب کچھ پایا جاتا ہے سوائے؟
- A layer of dead cells
- Blood vessels
- Nerve endings
- Hair follicles
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Explanation
- Dead cells are found in the epidermis, not the dermis.
- The dermis is the middle layer of the skin.
- It contains blood vessels, nerves, and hair follicles.
- It provides nourishment and support to the skin.
Last verified on 04-06-2026
