BIOLOGY
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ریشم کے کیڑے میں پیبرائن کی بیماری کس روگجن کی وجہ سے ہوتی ہے؟
- Bacillus thuringiensis
- Nosema bombycis
- Salmonella typhi
- None of these
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Explanation
- Pebrine is a dangerous disease of silkworms.
- It is caused by a microscopic protozoan parasite named Nosema bombycis.
- It affects growth, reproduction, and silk production.
- The infection can spread from infected moths to eggs.
- It is one of the major diseases in sericulture.
Last verified on 21-05-2026
درجہ بندی کا باپ کس کو کہا جاتا ہے؟
- Edward Jenner
- Alexander Fleming
- Louis Pasteur
- Carolus Linnaeus
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Explanation
- Carl Linnaeus is known as the Father of Biological Classification (Taxonomy).
- He introduced the binomial nomenclature system (two-name system).
- This system gives every organism a Genus and Species name.
- It made classification of living organisms systematic and universal.
- His work is the foundation of modern taxonomy.
Last verified on 21-05-2026
ہاتھی کے حمل کی مدت تقریباً کتنی ہوتی ہے؟
- 9–12 months
- 12–15 months
- 18–22 months
- None of these
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Explanation
- Gestation period means the time an animal carries a baby in the womb.
- Elephants have the longest gestation period among land mammals.
- It lasts approximately 18 to 22 months (about 1.5 to 2 years).
- This long period allows proper development of the calf.
- Usually, elephants give birth to a single calf.
Last verified on 21-05-2026
لعاب میں موجود امیلیز کا بہترین پی ایچ تقریباً کیا ہوتا ہے؟
- 2.0 – 3.0
- 4.5 – 5.5
- 6.8 – 7.0
- None of these
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Explanation
- Salivary amylase works best in a neutral pH environment.
- The mouth provides a slightly neutral condition (~6.8–7.0).
- At this pH, starch digestion begins efficiently in the oral cavity.
Last verified on 21-05-2026
ریشم کے کیڑے کی پیبرائن بیماری کس وجہ سے ہوتی ہے؟
- Bacteria
- Virus
- Protozoa
- None of these
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Explanation
- Pebrine is a serious disease of silkworms.
- It is caused by a microscopic parasite called a protozoan.
- This disease spreads quickly and affects silk production badly.
- Infected silkworms show weak growth and dark spots on the body.
- It can be transmitted from infected eggs to new generations.
Last verified on 21-05-2026
ریشم کا کیڑا کس فیلم سے تعلق رکھتا ہے؟
- Mollusca
- Arthropoda
- Annelida
- None of these
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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
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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
