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.
Explanation Pulse is the rhythmic bulging of the walls of the artery with each heartbeat . Each ventricular contraction causes a spike in blood pressure that stretches the walls of the arteries. This spike , called pulse , can be felt by placing the t ips of the fingers on the opposite wrist . This pressure spike is partially due to the narrow openings of the arterioles .
مندرجہ ذیل میں سے کون سے کیمیکل فوٹو کیمیکل سموگ کی پیداوار کے لیے ذمہ دار ہیں؟
A. Nitrates and sulfates
B. Nitrogen oxides and Hydrocarbons
C. None of these
D. Nitrates and phosphates
Check answer and explanation
Answer: Nitrogen oxides and Hydrocarbons
Explanation Photochemical smog: NOX is one of the primary causes of photochemical smog. Photochemical smog is a condition that develops when primary pollutants (such as oxides of nitrogen and volatile organic compounds ) interact under the influence of sunlight to produce a mixture of secondary pollutants. Thus photochemical smog is mainly composed of oxides of nitrogen, volatile organic compounds (primary pollutants), ozone, and peroxyacetyl nitrate (PAN) (secondary pollutants). Note : It depends on primary pollutants as well as the formation of secondary pollutants. Primary pollutants include Oxides of nitrogen, particularly nitric oxide (NO) and nitrogen dioxide (NO2) Volatile organic compounds. Secondary pollutants include Peroxyl-acyl nitrates (PAN) Tropospheric ozone Aldehydes An important secondary pollutant for photochemical smog is ozone , which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight.
ایک ایسا نظام جس میں کسی تنظیم یا معاشرے کے ممبران کو رشتہ دار حیثیت یا اتھارٹی کے مطابق درجہ دیا جاتا ہے ______ کہلاتا ہے؟
A. Social status
B. Hierarchy
C. Social organization
D. None of these
Check answer and explanation
Answer: Hierarchy
Explanation A hierarchy is a system in which members of an organization or society are ranked based on relative status or authority. It establishes a structure where higher-ranking individuals or groups have more power or influence.
Explanation Human ethology is the study of human behavior. It focusing on natural and instinctive behaviors in humans. This often from an evolutionary perspective. It explores how human behavior has developed. It is shaped by biological and environmental factors.
اگر خون میں کاربن ڈائی آکسائڈ حراستی بڑھ جاتی ہے تو ، سانس لینے میں _____ ہوگا؟
A. Stop
B. Decrease
C. None of these
D. Increase
Check answer and explanation
Answer: Increase
Explanation High CO₂ levels lower blood pH , stimulating the medulla oblongata to increase breathing rate. This helps remove excess CO₂ and restore normal pH balance.
ایک پروٹین کے لیے ایک لازمی جھلی پروٹین بننے کے لیے اسے مندرجہ ذیل میں سے کون سا ہونا چاہیے؟
A. Amphipathic
B. Hydrophobic
C. None of these
D. Hydrophilic
Check answer and explanation
Answer: Amphipathic
Explanation Integral membrane proteins are amphipathic , with hydrophobic regions embedded in the lipid bilayer and hydrophilic regions exposed to the aqueous environment. This structure allows them to span the membrane and perform functions like transport and signaling.
Explanation Angiotensin III is part of the r enin-angiotensin system, which regulates blood pressure and fluid balance. The juxtaglomerular cells, located in the kidneys, release renin in response to a decrease in sodium chloride concentration in the distal tubules. Renin then catalyzes the conversion of angiotensinogen to angiotensin I, Which is further converted to angiotensin II, and subsequently to angiotensin III . This cascade helps in regulating blood pressure and sodium balance.
Explanation Dolphins exhibit unihemispheric sleep, where one brain hemisphere sleeps while the other stays awake. This adaptation allows them to surface for air and remain alert to predators.
مچھلیاں ہوا کو گھولنے یا تھوکنے سے حجم کو ایڈجسٹ کرتی ہیں، زیادہ تر اتلی پانی کی انواع ہیں، گیس تھوکنے والی اور سطح پر ہوا کو گھونٹنے والی۔ _____
A. None of these
B. Lung fishes
C. Physostomous
D. Physoclistous
Check answer and explanation
Answer: Physostomous
Explanation Physostomous fishes adjust swim bladder volume by gulping or spitting air, allowing buoyancy control . They are typically shallow-water species that surface to gulp or release gas.
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