Zoology MCQs - Everyday Science Practice | PakExamPoint
Practise Zoology MCQs in Everyday Science. Attempt multiple-choice questions, check answers and revise related subtopics.
Zoology MCQs and revision practice
Study Zoology through multiple-choice questions in Everyday Science. This subtopic contains 1568 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.
Use these Zoology MCQs to identify the facts, rules or methods you need to revise. Where an explanation is available, work through it and write down why your chosen option was correct or incorrect. Revisit difficult questions after reviewing your notes, then use exam mode for timed practice.
ہائپوتھیلمس میں ایپی نیفرین کی سطح میں کمی کا سبب بن سکتا ہے۔ _____
A. Estrogen
B. Dihydrotestosterone
C. Androgens
D. None of these
Check answer and explanation
Answer: Estrogen
Explanation Estrogen has been shown to reduce the levels of norepinephrine in the hypothalamus. This hormone modulates neurotransmitter systems, including noradrenergic pathways , influencing behavior and physiological responses.
Explanation Social behavior in animals includes dominance and subordinate relationships, territorial rights, and leadership , which help maintain group structure and cooperation. These behaviors ensure survival, resource allocation, and reproductive success within animal communities.
مصنوعی انتخاب میں انسان جو کردار ادا کرتے ہیں وہ _____ ہے؟
A. Train organisms to breed more successfully
B. None of these
C. Create the genetic variants, which nature then selects
D. Choose which organisms breed, and which do not
Check answer and explanation
Answer: Choose which organisms breed, and which do not
Explanation In artificial selection , humans choose which organisms breed based on desired traits, influencing the next generation . This process involves selecting organisms with specific characteristics. Unlike natural selection , which occurs without human intervention.
Explanation I n water, hydrophobic side chain s fold inward, away from water. This drives the overall 3D shape (tertiary structure) of proteins. Hydrogen bonds, ionic bonds, and disulfide bridges also contribute but are secondary to hydrophobic interactions in aqueous environments. Last updated question 25 feb 2026
نیڈیرینس میں مخصوص آرگنیلز کی موجودگی کی ایک انوکھی خصوصیت ہوتی ہے جو _____ نامی ڈنکنگ دھاگے کو نکالتا ہے؟
A. Choanocyte
B. Cnidocytes
C. Nematocysts
D. None of these
Check answer and explanation
Answer: Nematocysts
Explanation Nematocysts are specialized stinging organelles found within cnidocytes of cnidarians. They eject a thread to capture prey or for defense when triggered.
Explanation As of the most widely accepted recent estimates, about 2.13 million species have been formally described by scientists . This number includes: Animals (insects, mammals, birds, etc.) Plants Fungi Protists Bacteria and archaea (though many microbes remain undescribed)
Explanation Most fish typically have one lateral line system running along each side of their body. The lateral line detects vibrations and movements in the water. It aiding fish in navigation and prey detection.
Explanation The lithosphere constitutes the Earth's surface. It including the crust and the upper mantle. It forms the rigid, outermost physical shell of the planet.
مندرجہ ذیل میں سے، کون سا ٹیکسن پولی پلاڈی کی واضح سطح کو ظاہر کرتا ہے؟
A. Amphibians
B. None of these
C. Fishes
D. Rodents
Check answer and explanation
Answer: Fishes
Explanation Polyploidy , the presence of multiple sets of chromosomes, is pronounced in many fish species, aiding in adaptation and speciation. This phenomenon is less common in amphibians, rodents, and other taxa.
سنگل سیل سے 64 کا پول رکھنے کے لئے کتنی مائٹوٹک کوششوں کی ضرورت ہے؟
A. 7
B. 6
C. None of these
D. 8
Check answer and explanation
Answer: 6
Explanation In mitosis, a single cell divides into two , and each subsequent division doubles the number of cells . To reach a pool of 64 cells , 6 mitotic divisions are required (2^6 = 64).
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