FPSC ALL PAST PAPERS 2025 EVERYDAY SCIENCE MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ریشم کا کیڑا کس فیلم سے تعلق رکھتا ہے؟
- Mollusca
- Arthropoda
- Annelida
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Silkworm is the larval stage of the silk moth.
- It belongs to the phylum Arthropoda, which includes insects.
- Arthropods have a segmented body, exoskeleton, and jointed legs.
- Silkworm is scientifically known for producing natural silk.
- It is widely used in sericulture (silk farming).
Last verified on 21-05-2026
اگر کسی نسل کے فینوٹائپس میں مساوی غالب اور متواتر حیاتیات ہیں (1:1 تناسب)، تو یہ کیا نمائندگی کرتا ہے؟
- Law of dominance
- Law of independent assortment
- Law of segregation
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Gregor Mendel proposed laws of inheritance based on pea plant experiments.
- A 1:1 phenotypic ratio is typical of a test cross (heterozygous × homozygous recessive).
- This occurs due to the separation (segregation) of alleles during gamete formation.
- Each gamete receives only one allele from a gene pair.
- Hence, equal chances of dominant and recessive offspring appear.
Last verified on 21-05-2026
- 1:1:1:1
- 9:3:3:1
- 3:1
- None of these
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Explanation
- A test cross means crossing a heterozygous organism with a double recessive one (AaBb × aabb).
- If genes assort independently, four types of offspring appear equally.
- Therefore, the phenotypic ratio is 1:1:1:1.
Last verified on 21-05-2026
- Tt
- TT
- TTT
- None of these
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Explanation
- Gregor Mendel performed monohybrid crosses on pea plants.
- In this cross, pure tall plant (TT) is crossed with pure dwarf plant (tt).
- Each parent contributes one allele to the offspring.
- All F1 offspring receive genotype Tt.
- Since tallness (T) is dominant, all F1 plants appear tall.
Last verified on 21-05-2026
لیمارک کا نظریہ درج ذیل میں سے کس چیز کی حمایت نہیں کرتا؟
- Adaptation through environmental influence
- Use and disuse of organs
- Inheritance of acquired characters
- Evolution by genetic variation arising before environmental need
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Explanation
- Jean-Baptiste Lamarck proposed one of the earliest theories of evolution.
- Lamarck’s theory explains evolution through use and disuse of organs.
- It also supports inheritance of acquired characteristics (traits gained during life are passed to offspring).
- He believed organisms adapt directly due to environmental changes.
- His theory does not include modern genetic concepts.
Last verified on 21-05-2026
جدید مصنوعی نظریہ ارتقاء، ڈارون کے اصل نظریے سے بنیادی طور پر کس چیز کی شمولیت کی وجہ سے مختلف ہے؟
- Fossil evidence and embryology
- Genetics and population thinking
- Natural selection only
- None of these
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Explanation
- Modern Synthetic Theory (Neo-Darwinism) is an updated form of Darwin’s theory.
- It combines natural selection with genetics to explain evolution.
- It introduces population genetics instead of focusing only on individuals.
- It explains how gene frequencies change in populations over time.
- It provides a scientific basis for heredity and variation.
Last verified on 21-05-2026
ڈی این اے پولیمریز ڈی این اے کو کس سمت میں نقل کرتا ہے؟
- 3′ → 5′ only
- 5′ → 3′ only
- Both A and B
- None of these
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Explanation
- DNA polymerase is an enzyme involved in DNA replication.
- It adds new nucleotides only in the 5′ → 3′ direction.
- This process was explained through the semiconservative model of DNA replication.
- The enzyme reads the template strand in the opposite 3′ → 5′ direction.
- DNA replication mainly occurs during the S-phase of the cell cycle.
Last verified on 21-05-2026
پٹیرڈوفائٹس میں غالب نسل کون سی ہوتی ہے؟
- Zygote
- Gametophyte
- Sporophyte
- None of these
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Explanation
- Pteridophytes (e.g., ferns) show alternation of generations.
- The sporophyte (2n) is the large, independent, and dominant stage.
- The gametophyte is small and short-lived in comparison.
Last verified on 20-05-2026
اگر دونوں والدین نارمل ہوں لیکن ان کا بچہ رسیسو بیماری کا شکار ہو، تو والدین کا ممکنہ جینی ٹائپ کیا ہوگا؟
- Aa and Aa
- AA and AA
- AA and Aa
- None of these
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Explanation
- A recessive disorder appears only in homozygous recessive (aa) condition.
- Since parents are phenotypically normal but produced an affected child, both must be carriers (heterozygous Aa).
- Cross Aa × Aa can produce aa offspring (affected child).
Last verified on 20-05-2026
ڈائی ہائبرڈ کراس میں صحیح فینوٹائپک تناسب کیا ہوتا ہے؟
- 1:2:1
- 9:3:3:1
- 12:3:1
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- In a classic Mendelian dihybrid cross (AaBb × AaBb), traits assort independently.
- This produces four phenotypic classes in the ratio:
- 9 (both dominant) : 3 : 3 : 1 (both recessive).
Last verified on 20-05-2026
