BIOLOGY
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
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
کراؤس کی ڈسک کس کا دوسرا نام ہے؟
- Sarcolemma
- H zone
- Z line
- Sarcomere
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Explanation
- Krause’s discs are also known as Z lines in muscle fibers.
- They mark the boundary of a sarcomere.
- They play an important role in muscle contraction structure.
- Found in striated (skeletal) muscles.
Last verified on 04-06-2026
معدے میں دودھ کے جماؤ کی وجہ کون سا عمل ہے؟
- Pepsin
- Renin
- HCI
- Rennin
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Explanation
- Rennin is the enzyme responsible for curdling milk in the stomach.
- It converts milk protein (casein) into curd (solid form).
- This process helps in easier digestion of milk in infants.
- It is mainly active in the stomach of young mammals.
Last verified on 03-06-2026
زیادہ تر خلیاتی رطوبت اس وقت ہوتی ہے جب کوئی الرجین کس کے ساتھ ملتا ہے؟
- IgG antibodies
- IgE antibodies
- IgM antibodies
- IgA antibodies
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Explanation
- IgE antibodies are responsible for allergic reactions.
- When an allergen binds with IgE, it activates mast cells.
- This leads to the release of histamine and other chemicals.
- These chemicals cause allergy symptoms like itching, swelling, and sneezing.
Last verified on 04-06-2026
جب آبادی چھوٹی ہو تو کس چیز کا زیادہ امکان ہوتا ہے؟
- Gene flow
- Genetic drift
- Natural selection
- Sexual selection
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Explanation
- Genetic drift is the random change in gene frequencies in a population.
- It has a stronger effect in small populations.
- In small populations, chance events can strongly change allele frequencies.
- It can lead to loss of genetic variation over time.
Last verified on 04-06-2026
ٹرانسکرپشن کے لیے درکار انزائم کون سا ہے؟
- RNAase
- Endonucleases
- RNA polymerase
- DNA polymerase
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Explanation
- RNA polymerase is the enzyme required for transcription.
- It helps in synthesizing RNA from a DNA template.
- Transcription is the first step of gene expression.
- It occurs in the nucleus of eukaryotic cells.
- RNA strand is formed complementary to DNA.
Last verified on 04-06-2026
کوئلے کے ذخائر کے لیے کاربونیفیرس دور کب تھا؟
- 50 mya
- 500 mya
- 2000 mya
- 300 mya
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Explanation
- Carboniferous period of coal deposition was mainly took place around 300 million years ago.
- The Carboniferous period is known for extensive coal formation.
- It occurred during the late Paleozoic Era.
Last verified on 04-06-2026
ڈروسوفیلا میں جنس کے تعین کے پیچیدہ طریقہ کار کی وضاحت کے لیے پیش کردہ نظریہ کون سا ہے؟
- Linage theory
- Genetic balance theory
- Mosaics theory
- Classical theory
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Explanation
- The genetic balance theory explains sex determination in Drosophila.
- It was proposed to explain the ratio of X chromosomes to autosomes.
- Sex is determined by the balance between X chromosomes and autosomal genes.
- It helps explain male and female development in fruit flies.
Last verified on 04-06-2026
