FPSC ALL PAST PAPERS 2025 EVERYDAY SCIENCE MCQS
FPSC 5 Years Past Papers Click here
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
- Tt
- TT
- TTT
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
جگالی جانور اپنے معدے میں سیلولوز کو کیوں ہضم کر سکتے ہیں؟
- They have microorganisms that digest cellulose
- They produce cellulase enzymes themselves
- Cellulose is easily broken down by acid
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Ruminants (like cows and sheep) have bacteria and protozoa in their rumen.
- These microorganisms produce enzymes that break down cellulose.
- This allows the animal to extract energy from plant material.
Last verified on 20-05-2026
ڈبل اسٹرینڈڈ ڈی این اے میں اگر ایڈینین کی مقدار %30 ہو تو سائٹوسین کی مقدار کیا ہوگی؟
- 20%
- 30%
- 40%
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- A = 30%, so T = 30% (because A = T).
- Total = 100%
- Remaining = 100 − (A + T) = 100 − 60 = 40%
- C = G, so C = 20% and G = 20%
Last verified on 20-05-2026
مائٹوسس کے دوران بہن کرومیٹڈس کے عدم جدا ہونے سے بیٹی خلیات میں کیا نتیجہ نکلتا ہے؟
- Identical diploid sets
- Haploid chromosome number
- Aneuploidy
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- In nondisjunction, sister chromatids fail to separate properly.
- This results in daughter cells with extra or missing chromosomes.
- Such abnormal chromosome numbers are called aneuploidy.
Last verified on 20-05-2026
