SENIOR ELEMENTARY TEACHER BIOLOGY, ZOOLOGY, BOTANY PAST PAPER 14-05-2026
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ایک بھیڑیا ایک ماحولیاتی نظام میں داخل ہوتا ہے، جس سے سبزی خور کی تعداد کم ہو جاتی ہے اور پودوں دوبارہ بڑھنے لگتی ہے۔ یہ کس چیز کی مثال ہے؟
- Competition
- Symbiosis
- Trophic cascade
- None of these
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Explanation
- A trophic cascade is an ecological process where changes at the top of the food chain affect multiple lower levels.
- In this case, the wolf (top predator) reduces herbivore population.
- With fewer herbivores, plants and vegetation recover and grow.
- It shows how predators control ecosystem balance.
- It is an example of top-down regulation in ecology.
Last verified on 21-05-2026
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
